Byeong Seong Kang

University of Ulsan, Urusan, Ulsan, South Korea

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Publications (11)16.39 Total impact

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    ABSTRACT: Two-dimensional fluoroscopy-based computerized navigation for the placement of pedicle screws offers the advantage of using stored patient-specific imaging data in providing real-time guidance during screw placement. The study aimed to describe the accuracy and reliability of a fluoroscopy-based navigation system for pedicle screw insertion.
    Journal of Korean Neurosurgical Society. 07/2014; 56(1):16-20.
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    ABSTRACT: PURPOSE The purpose of this study is to determine the optimal dose of 0.75% ropivacaine for an ultrasonography-guided suprascapular nerve block (SNB) in order to manage both pain and disability in patients with chronic shoulder pain. METHOD AND MATERIALS This prospective study involved 100 patients with chronic shoulder pain; it was conducted between October 1, 2011 and August 31, 2012. Full-thickness or partial-thickness rotator cuff tear, bursitis or advanced adhesive capsulitis was not seen on MR imaging in any enrolled patients. All patients underwent ultrasonography-guided SNB at our medical institution. These patients were randomly divided into four groups (A ~ D) of 25 patients each and received infusion of 0.75% ropivacaine. In group A, the SNB was performed using 2.5 ml 0.75% ropivacaine. Group B was injected with 5 ml, group C with 7.5 ml, and group D with 10 ml. Each patient’s outcome was assessed on the basis of the visual analog scale (VAS) scores at rest and on movement, and American Shoulder and Elbow Surgeons (ASES) scores were recorded before the nerve block, immediately following the procedure, one week, and one month following the procedure, respectively . RESULTS There was no statistically significant difference among the four groups regarding the VAS score at rest before the procedure, immediately following the procedure or at the one-week and one-month follow-up examinations. On the one-month follow-up, the VAS score on movement in the group B patients was significantly different compared to that of group A, however, there was no significant difference compared to the scores of group C and group D. There was also no statistically significant difference in the ASES scores among the four groups before the procedure, immediately following the procedure or on the one-week and one-month follow–up examinations. There were no complications except for one patient in group D whose complaint of mild nausea immediately following the procedure. CONCLUSION These data suggest that the optimal volume of 0.75% ropivacaine is 5 ml for ultrasonography-guided SNB in patients with chronic shoulder pain. CLINICAL RELEVANCE/APPLICATION The 5ml of 0.75% of ropivacaine is the most effective dose for an ultrasonography-guided SNB and is recommended in patients with chronic shoulder pain.
    75% Ropivacaine in Patients with Chronic Shoulder Pain: What Is the Optimal Dose?. Radiological Society of North America 2013 Scientific Assembly and Annual Meeting; 12/2013
  • Sang Hun Ko, Byeong Seong Kang, Chang Ho Hwang
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    ABSTRACT: PURPOSE: To evaluate the efficacy of ultrasonography-guided (UG) and electrophysiology-guided (EG) suprascapular nerve block (SNB) for arthroscopic acromioplasty with regard to pain relief. METHODS: A prospective, double-blind, randomized controlled clinical trial was performed from June 2007 to April 2010. Patients who were scheduled for elective arthroscopic acromioplasty and who met the inclusion criteria were assigned to 1 of 2 experimental groups (UG or EG SNB) or to 1 blind group (using anatomic landmarks). Before surgery, an SNB was performed with either ultrasonographic or electrophysiologic guidance or with no assistive devices (blind). Variables were collected at 4, 24, 48, and 72 hours postoperatively. RESULTS: Sixty-three patients were initially enrolled in the study, but 11 dropped out for various reasons. In the UG group at 4 hours, the visual analog scale score at rest (30 ± 12.0 v 39 ± 9.9 for EG group and 41 ± 11.8 for blind group) and when the patient was moving (42 ± 15.2 v 52 ± 11.5 for EG group and 53 ± 12.6 for blind group) was significantly decreased compared with the EG and blind groups (P < .05). Opioid consumption during the first 24 hours was significantly reduced in the UG and EG groups (4.3 ± 1.9 mg and 3.8 ± 2.3 mg, respectively) compared with the blind group (5.1 ± 2.2 mg) (P < .05). The visual analog scale score at rest and when the patient was moving; the pain score on the University of California, Los Angeles questionnaire; and the activities of daily living score on the American Shoulder and Elbow Surgeons questionnaire in the EG and UG groups improved more than the values in the blind group over the follow-up intervals (P < .05). Morphine consumption in the EG and UG groups by the first, second, and third days was significantly smaller than that in the blind control group (P < .05). CONCLUSIONS: UG and EG SNB can reduce pain and painkiller consumption for up to 72 hours postoperatively. Ultrasonographic or electrophysiologic guidance is more effective than the blind method of SNB. LEVEL OF EVIDENCE: Level I, randomized controlled trial with significant difference.
    Arthroscopy The Journal of Arthroscopic and Related Surgery 02/2013; · 3.10 Impact Factor
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    ABSTRACT: PURPOSE The purpose of this study is to explore the usefulness of an ultrasound-guided suprascapular nerve block in patients with rotator cuff tear in order to manage their postoperative pain. METHOD AND MATERIALS This prospective study involved 31 patients (25 males and 6 females) who had been diagnosed with rotator cuff tear between July 1, 2010 and December 31, 2010. Fifteen patients underwent ultrasound-guided suprascapular nerve block, while another 16 patients underwent placebo injection of normal saline on hypodermic layer overlying the spine of scapula. Ultrasonography was performed using a linear-array transducer (5- to 12-MHz). A 20-gauge, 3.5-inch spinal needle was positioned directly into the suprascapular notch during real-time visualization while injecting a mixture of 5ml of 0.5% ropivacaine and 5ml of normal saline. Each patient’s outcome was assessed on the basis of the visual analog scale (VAS) results that were recorded at 4 hours, 24 hours, and 48 hours postoperatively with ultrasound-guided suprascapular nerve block group and placebo group. RESULTS In each case of ultrasound-guided suprascapular nerve block, a low echoic fluid collection in the suprascapular notch was seen on ultrasonography. The VAS scores of 4 hours, 24 hours, and 48 hours postoperatively were significantly reduced compared with the scores of patients’ who did placebo injection (p<0.05, respectively). There were no complications at the injection site, and none of the patients had pneumothorax or systemic side effects after injection. CONCLUSION Ultrasound-guided suprascapular nerve block for patients with rotator cuff tear is a safe and useful method for managing postoperative pain. CLINICAL RELEVANCE/APPLICATION Preoperative ultrasound-guided suprascapular nerve block is an effective and safe method and is recommended for managing postoperative pain in patients with rotator cuff tear.
    Radiological Society of North America 2011 Scientific Assembly and Annual Meeting; 11/2011
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    ABSTRACT: To describe and analyze the ultrasonographic appearance of subcutaneous angiolipoma in pathology-proven cases. We retrospectively searched the January 2004 to May 2011 surgical pathology database for cases of pathology-proven angiolipoma. The ultrasonographic findings were analyzed for angiolipoma size, shape, margin, echo texture, echogenicity, acoustic enhancement, calcifications, and color Doppler flow. Of 31 angiolipomas, 19 lesions occurred in an upper extremity, one in a lower extremity, nine in the chest and abdominal wall, and two in the back. The mean tumor size was 17.7 mm. Twenty-five cases (80%) appeared as oval mass and all tumors had well-defined margins. All cases showed hyperechoic; 14 (45%), homogeneous; 17 (55%), heterogeneous. Seven cases (23%) showed blood flow in the mass. Acoustic enhancement and calcification was not shown in any cases. A correct preoperative diagnosis was made in three cases (10%) by ultrasonography. Most subcutaneous angiolipomas are oval-shaped, have well-defined margins, and hyperechoic appearance on ultrasonography. Although color Doppler flow of subcutaneous angiolipoma is not seen in many cases, it may helpful in differentiating angiolipoma from ordinary subcutaneous lipoma.
    Skeletal Radiology 11/2011; 41(9):1055-9. · 1.74 Impact Factor
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    ABSTRACT: Persistent primitive trigeminal artery (PPTA) is the most common permanent carotid-basilar anastomosis. Magnetic resonance angiography (MRA) has become the primary non-invasive imaging technique for evaluation of cerebral vascular anatomy and can provide detailed 3D imaging of intracranial vessels. To evaluate the usefulness of MRA for the detection of PPTA and to re-classify its variations based on the embryologic types of PcomA and its relationship with the basilar artery and its branches. Of the total 7329 patients who underwent MRA at our institution from March 2008 through November 2010, we retrospectively analyzed the MRAs of 24 patients with a PPTA. Special attention was given to defining the relationship of the PPTA and the basilar artery with PcomA and to determine the site of origin, size, and course of the PPTA. The PPTA classification included five types based on their anatomic relationship to the neighboring arteries. Clinical features and associated vascular anomalies are also described. Twenty-four (17 women and seven men, 34 ~ 81 years of age, mean age 59.67 years) of the 7329 patients had a PPTA (0.33 %). Eleven cases (45.8%) were classified as type 1, three (12.5%) as type 2, five (20.8%) as type 3, one (4.2%) as type 4, and four (16.7%) as type 5b. Fifteen PPTAs (62.5%) were located on the left side and nine were located (37.5%) on the right side. The basilar artery proximal to the insertion of the PPTA showed severe to moderate hypoplasia in 13 cases (54%). Nine intracranial artery aneurysms were detected in seven (29%) of the 24 study patients. This study revealed five types of PPTA and necessitates an adjustment of the previous classification of PPTA on the basis of our MRA examinations. A PPTA should be considered by both the clinician and the radiologist who interpret MR angiography.
    Acta Radiologica 11/2011; 52(9):1043-51. · 1.33 Impact Factor
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    ABSTRACT: The presence of an intratesticular solid lesion is usually highly suspicious for malignancy. Conversely, most extratesticular solid lesions including paratesticular lesions are benign. The characteristic imaging features of malignant solid testicular lesions are well known, but various unusual causes and imaging features of benign solid testicular lesions can be particularly misleading. Therefore, a careful assessment of solid testicular and paratesticular lesions is warranted. The purpose of this article is to present the clinical and imaging features of the spectrum of benign solid testicular and paratesticular lesions. We demonstrate a variety of benign solid testicular and paratesticular lesions and correlate them with pathologic results. Specific the clinical and imaging features of the spectrum of benign solid testicular and paratesticular lesions have been described. Familiarity with the clinical setting and imaging features of benign solid testicular and paratesticular lesions should facilitate prompt, accurate diagnosis and treatment.
    European Radiology 05/2011; 21(10):2226-34. · 4.34 Impact Factor
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    ABSTRACT: PURPOSE/AIM The purpose of this exhibit is: 1. Identify a possible spectrum of benign solid testicular lesions 2. Identify the clinical setting and imaging features that can be used to differentiate benign from malignant solid testicular lesions CONTENT ORGANIZATION Introduction - US and MR of evaluation for palpable testicular lesions. Usual Malignant Testicular Lesion - Germ cell tumor Seminoma, Non seminomatous germ cell tumor -Lymphoproliferative disease Lymphoma, Leukemia Unusual Benign Testicular Lesion - Intratesticular Lesion Epidermoid cyst, Mature cystic teratoma, Traumatic or spontaneous hemorrhage, isolated testicular tuberculosis - Abutting Lesion Leiomyoma, Torsed appendage, Adenomatoid tumor, Polyorchidism Conclusion SUMMARY The major teaching points of this exhibit are: 1. More than 95% of solid testicular lesions are malignant. Benign solid testicular lesions are rare, but recognition is important to avoid unnecessary operation. 2. Familiarity with the clinical setting and the imaging features of both usual malignant and unusual benign solid testicular lesions will facilitate prompt, accurate diagnosis and treatment.
    Ultrasound in Medicine and Biology - ULTRASOUND MED BIOL. 01/2009; 35(8).
  • Journal of ultrasound in medicine: official journal of the American Institute of Ultrasound in Medicine 10/2008; 27(9):1401-5. · 1.40 Impact Factor
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    ABSTRACT: The imaging characteristics of renal cell carcinoma (RCC) vary widely, with masses ranging from cystic to solid, from homogeneous to heterogeneous and necrotic, from small to large, and from localized to extensive. Although the usual imaging features of RCC are well known to radiologists, various unusual imaging features can be particularly misleading; therefore, both usual and unusual imaging features should always be carefully assessed. In this pictorial review, we describe the following unusual imaging features: unusual subtypes, unusual tumor growth, unusual underlying disease, multiple and bilateral presentations, hemorrhage and arteriovenous fistula (AVF)-related presentations, and mimicking of benign tumors. Familiarity with the imaging features of both usual and unusual RCCs will facilitate prompt and accurate diagnosis and treatment.
    Acta Radiologica 10/2008; 49(7):839-47. · 1.33 Impact Factor
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    ABSTRACT: Subcutaneous panniculitis-like T-cell lymphoma (SPTCL) is a rare disorder. We examined two females and one male with multiple soft-tissue masses in the abdominal wall. One of these three patients also had soft-tissue masses in the right thigh and right buttock. The histologic diagnosis was revealed as SPTCL in all three cases. The ultrasound (US) findings in two of these cases were diffuse, ill-defined hyperechoic areas with a linear vascular signal. The findings of the abdominal and pelvic computed tomography (CT) scanning with contrast enhancement were multiple enhancing nodules with an infiltrative pattern of peripheral subcutaneous fat layer in all three cases. We report US and CT findings of SPTCL in these three patients.
    Skeletal Radiology 07/2007; 36 Suppl 1:S67-71. · 1.74 Impact Factor
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    ABSTRACT: The purpose of this study was to prospectively assess the value of intermittent sonographic guidance in nonsurgical air reduction of childhood intussusception. The study group included 86 consecutive childhood intussusceptions confirmed on sonography for which we designed an air enema. With intermittent sonographic guidance of our own method, air was gradually injected to the initial intracolonic pressure of 60 mm Hg, which we attempted for 30 seconds on the initial attempt. If the air enema reduction attempts were not successful at a given pressure setting, we repeated the technique at each pressure setting upgraded by increments of 20 mm Hg up to 120 mm Hg. Surgery was performed when even repeated reduction attempts at the maximum intracolonic pressure of 120 mm Hg were unsuccessful. We calculated the successful reduction rate for the intussusceptions at each pressure setting. The overall success rate of sonographically guided air enema reductions was 95% (82/86). The success rates of air enema reductions at 60, 80, 100, and 120 mm Hg showed progressive increases of 53% (42/86), 67% (58/86), 78% (67/86), and 95% (82/86), respectively, with no immediate recurrence and no gross perforation. The use of intermittent sonographic guidance in air enemas is thought to help safely increase successful reductions of childhood intussusception even with sufficient air enema attempts.
    Journal of ultrasound in medicine: official journal of the American Institute of Ultrasound in Medicine 10/2006; 25(9):1125-30. · 1.40 Impact Factor