Sun-Won Park

Konkuk University Medical Center, Changnyeong, South Gyeongsang, South Korea

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Publications (22)42.01 Total impact

  • Article: The Prevalence and Features of Thyroid Pyramidal Lobe, Accessory Thyroid, and Ectopic Thyroid as Assessed by Computed Tomography: A Multicenter Study.
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    ABSTRACT: Background and Purpose: Understanding the CT characteristics of the pyramidal lobe and other thyroid variations and detecting them accurately using preoperative neck CT will minimize unnecessary remnant thyroid after total thyroidectomy in thyroid cancer patients. The purpose of the present study was to assess the frequency, location, and size of the pyramidal lobe and other thyroid variations using large-scaled, multicenter study. Methods: Neck CT scans for 200 patients were selected from 11 institutions; a total of 2200 patients were included in the study. The patients underwent neck CT for the following reasons: trauma, known thyroid malignancy, cervical lymphadenopathy, palpable neck mass, oropharyngolaryngeal malignancy, vocal cord palsy, post-chemotherapeutic CT follow-up, inflammatory or infectious neck lesion, parathyroid abnormality, and patient request. A single radiologist at each institution retrospectively analyzed 200 neck CT scans. Each radiologist investigated the presence, location, length, volume, and upper end of the pyramidal lobe and its separation or continuity with the main thyroid gland as well as the presence, location, length, and volume of the accessory or ectopic thyroid using a picture archiving and communication system. Results: A pyramidal lobe was present in 44.6% (981/2200) of the patients. The prevalence for the pyramidal lobe at the participating institutions ranged from 28.0% to 55.0% (mean, 44.6%). Pyramidal lobes originating from the left side of the thyroid were most common, and the number of pyramidal lobes showing separation from the main thyroid gland was 90 (9.2%). The mean AP diameter, transverse diameter, and length of the pyramidal lobe were 2.3 mm, 5.9 mm, and 20.8 mm, respectively. Among both men and women, the most common level of the upper end of the pyramidal lobes was the thyroid cartilage, but there was a significant difference in the frequency of the pyramidal lobe between genders (p < 0.0001). The rate of the pyramidal lobe detection in the 2-mm slice thickness group was higher than those in the 2.5- and 3-mm groups (p = 0.0003). Conclusion: Neck CT is useful for detecting the presence, size, configuration, and location of the pyramidal lobe and other thyroid variations.
    Thyroid: official journal of the American Thyroid Association 10/2012; · 2.60 Impact Factor
  • Article: Salivary duct carcinomas: clinical and CT and MR imaging features in 20 patients.
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    ABSTRACT: Salivary duct carcinoma (SDC) is an uncommon high grade adenocarcinoma of the salivary gland with a grave prognosis. The aim of this study was to investigate the clinical and CT and MR imaging features of SDC. We retrospectively evaluated the clinical and CT and MR imaging findings in 20 patients (14 men and six women; mean age, 59 years) with histologically proved SDC. We also tried to correlate clinicoradiological tumor staging with pathologic tumor staging in 17 patients who underwent surgery. The tumor originated in the parotid gland (n = 11; 55%), the submandibular gland (n = 7; 35%) and the buccal space along the distal Stensen's duct (n = 2; 10%). Locoregional recurrence occurred in 41% and distant metastasis in 47%. Fifty-eight percent died of the disease with a mean survival period of 32 months after diagnosis. On CT and MR images, SDC was mostly seen as an ill-defined (85%) and infiltrative (60%) mass with frequent calcification (50%) and necrosis (80%). Although various signal intensities were seen on MR images, six of nine tumors contained the areas of marked hypointensity on T2-weighted images. Clinicoradiological tumor staging correlated well with pathologic tumor staging in 82% of the patients. Ill-defined, infiltrative mass with calcification on CT scans and the areas of marked hypointensity on T2-weighted MR images may be useful radiologic features to suggest the diagnosis of SDC. CT and MR imaging are useful for staging of SDC.
    Neuroradiology 02/2012; 54(6):631-40. · 2.82 Impact Factor
  • Article: Nonoverlapping Y-configuration stenting technique with dual closed-cell stents in wide-neck basilar tip aneurysms.
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    ABSTRACT: Stent-assisted coiling is increasingly used to treat wide-neck intracranial aneurysms to protect the lumen of the parent artery from coil protrusion. This technique is insufficient for treating some aneurysms, depending on their configurations. To describe a variant of the Y-configuration stent-assisted coiling technique for the treatment of basilar tip aneurysms with wide necks. This technique, called the nonoverlapping Y stenting technique, consists of the deployment of a closed-cell self-expandable stent from the basilar trunk to a posterior cerebral artery and then placement of a second stent from the basilar bifurcation to the other posterior cerebral artery without overlapping the first stent. The proximal flared portion of the second stent was located at the neck of the aneurysm. Coil embolization was performed under dual-stent protection. We successfully filled wide-neck aneurysms with coils under stent protection by forming a bridge across the aneurysmal neck without overlapping 2 closed-cell stents. Six basilar tip aneurysms were successfully treated with this technique. The nonoverlapping Y stenting technique is a good alternative to traditional stent-assisted coiling. This technique is particularly suitable for the treatment of broad-neck bifurcation aneurysms.
    Neurosurgery 10/2011; 70(2 Suppl Operative):244-9. · 2.79 Impact Factor
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    Article: Pseudoaneurysm of the popliteal artery mimicking tumorous condition.
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    ABSTRACT: Diagnosing pseudoaneurysms of the popliteal artery is usually straightforward in physical examinations and imaging findings. However, when a pseudoaneurysm shows a soft tissue mass with adjacent osseous change, it can mimic a bone tumor or a soft tissue sarcoma. We present a case of a 65-year-old man who had a pseudoaneurysm of the popliteal artery showing soft tissue mass and insinuating into the intramedullary cavity of the tibia. This presented case emphasizes the importance of considering pseudoaneurysms in the differential diagnosis of an apparent soft tissue mass with pressure erosion in adjacent bone.
    Journal of the Korean Surgical Society. 06/2011; 80 Suppl 1:S71-4.
  • Article: Potential pitfalls and therapeutic implications of pretherapeutic radiologic staging in glottic cancers.
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    ABSTRACT: The aim of this study was to compare the radiologic findings with histological results of anatomically matched whole organ sections and to analyze the accuracy of pretherapeutic radiologic staging of glottic cancers. The histologic findings of surgical specimens of 30 patients who had undergone total or conservative partial laryngectomy for glottic cancers were matched and compared with the pretherapeutic radiologic findings using CT and MR imaging. The accuracy of pretherapeutic radiologic staging was assessed for specific subsites for staging of glottic cancers. The overall accuracy of pretherapeutic staging with CT and MR imaging was 84.9%; 12.1% associated with false positive and 3% associated with false-negative assessments. For all subsites, the overall sensitivity was 88%, specificity 84%, positive predictive value 65%, and negative predictive value 95%. Subsites such as the anterior commissure, paraglottic space, and pre-epiglottic space showed lower specificity (42%, 65%, and 79% respectively) than the overall specificity. The radiologic evaluation for cartilage invasion showed the accuracy of 84.8% and yielded acceptable specificity (89%) and high negative predictive value (98%). Although pretherapeutic radiological examination is a very useful technique for the evaluation of tumor invasion into specific laryngeal subsites, the pretherapeutic radiologic staging can be challenging when distinguishing tumor from peritumoral inflammation.
    Acta oto-laryngologica 04/2011; 131(8):869-75. · 0.98 Impact Factor
  • Article: Ultrasonographic findings of medullary thyroid cancer: differences according to tumor size and correlation with fine needle aspiration results.
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    ABSTRACT: Complete initial tumor resection is a key prognostic factor in patients with medullary thyroid carcinomas (MTCs), hence precise preoperative diagnosis is very important. Thyroid ultrasonography (US) is a first-line modality and can lead to the appropriate next diagnostic procedure. To evaluate the US characteristics of MTCs, to evaluate whether or not there is a difference in US findings according to tumor size, and to correlate the US findings with fine needle aspiration (FNA) results. Thirty patients with 36 MTCs who had a preoperative US and a MTC diagnosis based on surgery were included. The US findings of each nodule were retrospectively analyzed in terms of size, internal content, shape, margin, echogenicity of solid portions, the presence of calcifications, the type of calcifications, and the presence of a halo by two radiologists. Each lesion was classified as suspiciously malignant, indeterminate, or probably benign according to known US criteria. The FNA results for the 28 MTCs were reviewed from the cytology reports. The lesion size varied from 5.7-90.0 mm (mean 22.4 ± 14.4 mm). The predominate US findings included solid internal content (91.7%), round-to-oval shape (63.9%), smooth margins (52.8%), hypoechogenicity (72.2%), and micro- or macro-calcifications (61.1%). Twenty-six nodules (72.2%) were classified as suspiciously malignant, and 10 nodules (27.8%) were classified as indeterminate. Of the 27 MTCs classified as suspiciously malignant, 21 MTCs (77.8%) had micro- or macro-calcifications, which was the most common malignant feature. MicroMTCs (≤1 cm) had spiculated margins more frequently than macroMTCs (66.7% vs. 13.3%; P = 0.014) and macroMTCs (>1 cm) had smooth margins more frequently than microMTCs (63.4% vs. 0%; P = 0.006). Twenty-one MTCs with positive FNA results showed smooth margins and a larger size more frequently than seven MTCs with negative FNA results (66.7% vs. 14.3%; P = 0.029; mean diameter, 24.28 ± 13.45 mm vs. 11.74 ± 4.73 mm, P = 0.004, respectively). Based on US, the majority of MTCs can be classified as suspiciously malignant due to the presence of micro- or macro-calcifications. Small MTC size (≤ 10 mm) and a smooth margin may be factors predicting false-negative FNA results.
    Acta Radiologica 04/2011; 52(3):312-6. · 1.37 Impact Factor
  • Article: Can necrotizing infectious fasciitis be differentiated from nonnecrotizing infectious fasciitis with MR imaging?
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    ABSTRACT: To retrospectively evaluate whether magnetic resonance (MR) imaging findings can be used to differentiate necrotizing infectious fasciitis (NIF) from nonnecrotizing infectious fasciitis (non-NIF). Institutional review board approval was obtained, but patient consent was not required for this retrospective review of records and images because patient anonymity was preserved. Thirty patients (seven with NIF, 23 with non-NIF) were included in the study. The following imaging findings were analyzed on fat-suppressed T2-weighted MR images: (a) signal intensity in the deep fascia (low, high, or mixed high and low), (b) thickness of abnormal signal intensity in the deep fascia (≥3 mm or <3 mm), (c) pattern of abnormal signal intensity in muscle (no abnormality, peripheral bandlike signal intensity, or patchy high signal intensity), (d) degree of deep fascia involvement (partial or extensive), and (e) degree of compartment involvement (fewer than three compartments or three or more compartments). On contrast material-enhanced fat-suppressed T1-weighted images, the contrast enhancement patterns of the abnormal deep fascia (no enhancement, enhancement, or enhancement with nonenhancing portion) and the muscle (no abnormality, peripheral bandlike signal intensity, or patchy high signal intensity) were evaluated. The presence of abscesses in the subcutaneous fat layer was evaluated with all sequences. The patients with NIF had a significantly greater frequency of (a) thick (≥3 mm) abnormal signal intensity on fat-suppressed T2-weighted images, (b) low signal intensity in the deep fascia on fat-suppressed T2-weighted images, (c) a focal or diffuse nonenhancing portion in the area of abnormal signal intensity in the deep fascia, (d) extensive involvement of the deep fascia, and (e) involvement of three or more compartments in one extremity (P < .05). MR imaging is potentially helpful for differentiating NIF from non-NIF. http://radiology.rsna.org/lookup/suppl/doi:10.1148/radiol.11101164/-/DC1.
    Radiology 03/2011; 259(3):816-24. · 5.73 Impact Factor
  • Article: Emphasis on the MR imaging findings of brown tumor: a report of five cases.
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    ABSTRACT: Brown tumors are focal reactive osteolytic lesions that are encountered in patients with primary or secondary hyperparathyroidism, and these tumors have nonspecific magnetic resonance (MR) imaging findings. However, there are only a few reports on MR imaging of brown tumors. The purpose of this study is to describe the spectrum of MR imaging findings of brown tumors. The MR imaging features of five patients with clinical and pathological evidence of brown tumor were retrospectively reviewed by two radiologists. The patients had primary hyperparathyroidism, which was confirmed as parathyroid adenoma (n = 2) and parathyroid carcinoma (n = 3). The MR images were evaluated for the presence of solid or cystic portions, the signal intensity of the lesions, the contrast enhancement pattern and the presence of cortex destruction and fluid-fluid levels. Twelve bone lesions were detected on the MR images of five patients; three lesions in two patients, four lesions in one patient, and one lesion in two patients. The tumor was solid in three lesions, mixed solid and cystic in four, and cystic in five. All the solid lesions were accompanied by mixed lesions. Discontinuity of the cortex and adjacent soft-tissue enhancement were seen in all the solid lesions. Fluid-fluid levels were seen in two cases within the cystic component of the mixed lesions and cystic lesions. The five patients with brown tumor demonstrated a wide spectrum of MR imaging findings. There are few lesions that are osteolytic on the radiographs and that show a short T2 on MR imaging, such as brown tumor. Multiple cystic or mixed lesions are the expected findings of brown tumors.
    Skeletal Radiology 02/2011; 40(2):205-13. · 1.54 Impact Factor
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    Article: Ultrasonography and the ultrasound-based management of thyroid nodules: consensus statement and recommendations.
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    ABSTRACT: The detection of thyroid nodules has become more common with the widespread use of ultrasonography (US). US is the mainstay for detecting and making the differential diagnosis of thyroid nodules as well as for providing guidance for a biopsy. The Task Force on Thyroid Nodules of the Korean Society of Thyroid Radiology has developed recommendations for the US diagnosis and US-based management of thyroid nodules. The review and recommendations in this report have been based on a comprehensive analysis of the current literature, the results of multicenter studies and from the consensus of experts.
    Korean journal of radiology: official journal of the Korean Radiological Society 01/2011; 12(1):1-14. · 1.32 Impact Factor
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    Article: Granulocytic Sarcoma in the Head and Neck: CT and MR Imaging Findings.
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    ABSTRACT: To evaluate characteristic computed tomography (CT) and magnetic resonance (MR) imaging findings of granulocytic sarcomas of the head and neck. The CT (n=11) and MR (n=1) images obtained from 11 patients (7 males and 4 females; mean age, 23.5 yr; age range, 1 to 69 yr) with histologically-proven granulocytic sarcomas of the head and neck were retrospectively reviewed. Histological confirmation was done by bone marrow biopsy in 9 patients, and/or local biopsy in 4 patients. The imaging findings were analyzed with particular attention to location, size, shape, margin, bone destruction, internal architecture, pattern and degree of enhancement, and multiplicity of the lesions. The masses were most commonly located in the orbital cavity (n=8); other locations included lymph nodes (n=5) and palatine/pharyngeal/lingual tonsils (n=3). The mass sizes varied from a mean diameter of 1.3 to 5.8 cm (average, 2.6 cm). Multiple lesions were found in 6 patients. The shapes of the tumors were ovoid in 12 patients and irregular in 4 patients. Most lesions had poorly-defined margins (13/16) and invaded adjacent bony structures (5/16). On the pre-contrast CT images, the masses were iso- (5/8) or low-density (3/8) in comparison with muscle. The MRI, which was obtained in one patient in this study, showed that the mass was iso-signal intensity on T1-weighted images and iso-signal intensity on T2-weighted images compared to the gray matter of the brain. On the post-contrast CT images, there was homogenesous (n=12) or heterogeneous (n=4) enhancement, with mild (n=10), moderate (n=4), and marked (n=2) enhancement in the solid portions of the lesions. Although rare, granulocytic sarcomas arise in various locations in the head and neck area (most commonly in the orbit) in the form of well-demarcated, and mildly- and homogenously-enhancing masses with adjacent bony invasion.
    Clinical and Experimental Otorhinolaryngology 07/2009; 2(2):66-71. · 0.92 Impact Factor
  • Article: Orbital abscess from an odontogenic infection.
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    ABSTRACT: An orbital abscess is a rare but serious complication of an odontogenic infection, which can lead to loss of vision or worse. This paper presents a case of orbital abscess secondary to an infection from the upper molar teeth, which extended to the retobulbar and posterosuperior region of the orbit, close to the superior orbital fissure. The infection spreaded to the pterygopalatine and infratemporal fossa and then to the orbit via the inferior orbital fissure. This paper reviews the clinical presentation, differential diagnosis, route of spread, value of serial CT scanning, treatment and possible complications.
    Oral surgery, oral medicine, oral pathology, oral radiology, and endodontics 02/2007; 103(1):e1-6. · 1.50 Impact Factor
  • Article: Coexisting sublingual and submental dermoid cysts in an infant.
    Oral surgery, oral medicine, oral pathology, oral radiology, and endodontics 01/2007; 102(6):778-81. · 1.50 Impact Factor
  • Article: Clustered localized pigmented villonodular synovitis.
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    ABSTRACT: The localized form of pigmented villonodular synovitis (PVNS) is a rare pathologic entity characterized by limited involvement of the synovium. In the knee joint, which is the most commonly affected joint, the disorder generally presents as a single nodular lesion, or rarely as 2 or 3 multiple nodular lesions into the joint. We report 2 cases of localized PVNS in which multiple nodules were clustered in a limited patella fat pad area. Clustered, multiple nodular lesions in a limited area suggested to us to consider a variant of localized forms.
    Arthroscopy The Journal of Arthroscopic and Related Surgery 07/2005; 21(6):761. · 3.02 Impact Factor
  • Article: Lipoma arborescens of the knee.
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    ABSTRACT: Lipoma arborescens are rare lesions, typically located in the knee. They have a predilection for the suprapatellar pouch in the knee joint, but can also occur in any area of the knee joint. Magnetic resonance imaging of lipoma arborescens often reveals subchondral bone cyst and/or bone erosions, and there may appear to be a correlation between lipoma arborescens and osteoarthritis. We describe a case of histologically proven lipoma arborescens in the suprapatellar pouch and infrapatellar area of the knee with no damage to the posterior compartment and bone erosion in the proximal tibia without osteoarthritis.
    Arthroscopy The Journal of Arthroscopic and Related Surgery 11/2004; 20(8):e95-9. · 3.02 Impact Factor
  • Article: Pigmented villonodular synovitis of the temporomandibular joint: MR findings in four cases.
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    ABSTRACT: Although it is a rare condition, pigmented villonodular synovitis (PVNS) may involve temporomandibular joint (TMJ). The purpose of this study was to describe magnetic resonance (MR) findings of PVNS of the TMJ. Between April 1992 and August 2000, four patients (two men and two women, 22-58-year-old) who had histologically proven diagnoses of PVNS in their TMJ were found in our institution. Their MR findings were reviewed retrospectively, and were correlated with pathologic findings. In all four patients, MR images invariably showed profound hypointensity on both T1- and T2-weighted sequences. This finding was seen diffusely and homogeneously throughout the lesion, and was considered to be due to paramagnetic effect attributed to heavy hemosiderin pigmentation, which was revealed by histopathological examination. MR images also showed aggressive nature of the lesions with adjacent skull base destruction and intracranial extension in two of them. As is the case in the other anatomic site, PVNS of the TMJ can be confidently diagnosed on MR imaging on the basis of the presence of hemosiderin. MR imaging also plays a pivotal role in surgical planning by precise and detailed localization of the lesion.
    European Journal of Radiology 04/2004; 49(3):229-34. · 2.61 Impact Factor
  • Article: Mesectodermal leiomyosarcoma of the ciliary body.
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    ABSTRACT: We report a case of low-grade mesectodermal leiomyosarcoma of the ciliary body, an extremely rare tumor of neural crest origin, occurring in a 12-year-old boy. MR imaging showed a well-marginated, ovoid soft tissue mass at the right temporal ciliary body, accompanied by total retinal detachment. The mass was slightly hyperintense relative to contralateral vitreous on T1-weighted images and markedly hypointense on T2-weighted images and enhanced very well. Initial biopsy of the mass suggested a peripheral nerve sheath tumor. The mass grew rapidly after biopsy, and enucleation was performed. The final diagnosis based on histology and immunohistochemistry was a low-grade mesectodermal leiomyosarcoma. To our knowledge, this is the first reported case of a malignant form of mesectodermal leiomyoma of the ciliary body.
    American Journal of Neuroradiology 11/2003; 24(9):1765-8. · 2.93 Impact Factor
  • Article: Single shot fast spin echo diffusion-weighted MR imaging of the spine; Is it useful in differentiating malignant metastatic tumor infiltration from benign fracture edema?
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    ABSTRACT: This study aims to evaluate the usefulness of single shot fast spin echo diffusion-weighted MR imaging (DWSSFSE) in differentiating malignant metastatic tumor infiltration of vertebral bone marrow from benign vertebral fracture edema. Forty-six consecutive patients with 59 acute osteoporotic or traumatic vertebral fractures (mean age = 59) and 31 patients with 98 vertebral metastasis including 20 pathologic fractures (mean age = 53) were included in this study. Diffusion-weighted MR images were obtained by single-shot fast spin echo technique with diffusion gradient (b = 500 s/mm2, TR/TE: 5002/99) by using a 1.5 T MR scanner (Signa MR/i; GE Medical Systems, Milwaukee, WI, USA). T1- and T2-weighted images and short inversion time inversion-recovery (STIR) images were available in all 157 lesions, while contrast-enhanced images were available in 98 metastatic lesions. We evaluated signal intensity patterns on DWSSFSE in 157 lesions, which showed low signal intensity on T1-weighted images in both benign fractures and metastasis. The lesions on DWSSFSE were categorized as low, intermediate, and high signal intensity relative to presumed normal vertebra by concordant inspection of two experienced musculoskeletal radiologists. In benign fractures, DWSSFSE images showed low signal intensity in 56 vertebrae (95%) in 43 patients (93%) and intermediate signal intensity in only 3 vertebrae (5%) in 3 patients (7%). On the other hand, metastases most commonly had low signal intensity in 57 vertebrae (58%) in 25 patients (80%), intermediate signal intensity in 35 vertebrae (36%) in 16 patients (52%), and high signal intensity in 6 vertebrae (6%) in 3 patients (10%). Thus, intermediate and high signal intensities are far more common than benign fractures. Such differences in signal intensity were statistically significant (chi-square test, P < .05). High or intermediate signal intensity on DWSSFSE was highly specific for the diagnosis of metastatic tumor infiltration of the spine (sensitivity: 42%; specificity: 95%; true positive rate: 93%; false negative rate: 52%). DWSSFSE of the spine may be useful in differentiating metastatic tumor infiltration of vertebral bone marrow from benign fracture edema.
    Clinical Imaging 28(2):102-8. · 0.75 Impact Factor
  • Article: Compensatory hypertrophy of calf muscles after selective neurectomy.
    Choong Jae Lee, Jun Ho Park, Sun Won Park
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    ABSTRACT: Unexpected contour changes frequently occurred after surgical contouring of the calves by selective neurectomy of the nerve to the medial gastrocnemius muscle. We recently experienced a rather unusual case, in which the nerve to the medial gastrocnemius muscle was selectively transected on one side, whereas on the other side, the nerve to the soleus was transected by mistake. To investigate the reason for the contour change, the authors compared the muscle volume ratio of the posterior compartment of eight normal calves of eight normal volunteers with two calves in the reported case by using MRIs. The volume ration of normal control calves was 0.22:0.12:0.66, respectively, for the medial and lateral gastrocnemius muscles and the soleus muscle. In the case of the calf with atrophy of the medial gastrocnemius muscle, the volume ratio was 0.13:0.20:0.67, respectively. In the case of the calf with atrophy of the soleus muscle, the volume ratio was 0.27:0.14:0.59, respectively. Physician and the patient should keep in mind before the operation that even though one muscle in the calf is selectively atrophied after the selective neurectomy, the other muscles can hypertrophy for compensation, thus causing possible distortion of aesthetic result.
    Aesthetic Plastic Surgery 30(1):108-12. · 1.41 Impact Factor
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    Article: MR imaging in a child with scurvy: a case report.
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    ABSTRACT: Scurvy is very rare disease in industrialized societies. Nevertheless, it still exists in higher risk groups including economically disadvantaged populations with poor nutrition, such as the elderly and chronic alcoholics. The incidence of scurvy in the pediatric population is very low. This study reports a case of scurvy in a 5-year-old girl with cerebral palsy and developmental delay based on MRI findings.
    Korean Journal of Radiology 8(5):443-7. · 1.54 Impact Factor
  • Article: Nodular fasciitis in the head and neck: CT and MR imaging findings.
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    ABSTRACT: The purpose of this study was to describe the CT and MR imaging findings of nodular fasciitis occurring in the head and neck region. CT (n = 6) and MR (n = 4) images obtained from 7 patients (3 men and 4 women; mean age, 19.4 years; age range, 1-48 years) with surgically confirmed nodular fasciitis in the head and neck were retrospectively reviewed. All patients presented with a palpable mass in the head and neck that was noticed 1-3 months earlier: 5 in the face, one in the occipital scalp, and the remaining one in the supraclavicular fossa. We investigated the CT and MR imaging characteristics with emphasis on the location, size, internal content, margin, enhancement pattern, and signal intensity of the lesion. All lesions appeared as a discrete mass on imaging, ranging from 1.0 cm to 4.6 cm in diameter (mean, 2.2 cm). Six lesions, all of which appeared benign, were located in the subcutaneous tissue superficial to the deep cervical fascia. The remaining lesion was located deep to the temporalis muscle and showed an aggressive imaging appearance, markedly eroding the bony orbit and skull. Five lesions were solid, and 2 lesions were partly or completely cystic in appearance. Five lesions were well defined, whereas 2 lesions were ill defined. Four of 5 solid lesions showed moderate to marked diffuse enhancement, whereas the remaining lesion demonstrated mild enhancement. Two cystic lesions showed peripheral, nodular, or rim-like enhancement. Compared with muscle, both solid lesions had isointense signal intensity on T1-weighted images and hyperintense signal intensity on T2-weighted images, whereas the signal intensity of the solid portions of the deep-seated, partly cystic lesion was isointense on both T1-weighted and T2-weighted images. Although rare, nodular fasciitis occurs as a discrete solid or cystic mass in the head and neck, depending on the predominant stromal components. When one sees a head and neck mass with a superficial location and moderate to marked enhancement on CT and MR imaging, nodular fasciitis should be included in the differential diagnosis, especially in patients with a recently developed, rapidly growing mass and a history of recent trauma.
    American Journal of Neuroradiology 26(10):2617-23. · 2.93 Impact Factor