Fatih Kantarci

Istanbul University, İstanbul, Istanbul, Turkey

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Publications (121)291.28 Total impact

  • Deniz Çebi Olgun, Fatih Kantarci
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    ABSTRACT: A 31-year-old woman with Marfan's syndrome presented with amblyopia and a history of gradual bilateral vision loss over the previous 3 to 4 months. She had also had mild sensorineural hearing loss within the previous 2 weeks.
    New England Journal of Medicine 02/2015; 372(9):e13. DOI:10.1056/NEJMicm1308550 · 54.42 Impact Factor
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    ABSTRACT: Cell-based strategies that combine in vitro- expanded autologous chondrocytes with matrix scaffolds are currently preferred for full-thickness cartilage lesions of the knee ≥2 cm(2). Although this approach is reasonable, continuing advances in the field of cartilage repair will further expand the options available to improve outcomes. In the present clinical study, we compared the outcomes of matrix-induced autologous mesenchymal stem cell implantation (m-AMI) with matrix-induced autologous chondrocyte implantation (m-ACI) for the treatment of isolated chondral defects of the knee. Prospective, single-site, randomized, single-blind pilot study. Fourteen patients with isolated full-thickness chondral lesions of the knee >2 cm(2) were randomized into two treatment groups: m-AMI and m-ACI. Outcomes were assessed pre-operatively and 3, 6, 12 and 24 months post-operatively. Clinical evaluations revealed that improvement from pre-operation to 24 months post-operation occurred in both groups (p < 0.05). At all follow-up intervals, m-AMI demonstrated significantly better functional outcomes (motion deficit and straight leg raise strength) than did m-ACI (p < 0.05). At all follow-up intervals, m-AMI demonstrated significantly better subjective sub-scale scores for pain, symptoms, activities of daily living and sport and recreation of the knee injury and osteoarthritis outcome score (KOOS) than did m-ACI (p < 0.05). Additionally, m-AMI demonstrated significantly better (p < 0.05) scores than m-ACI for the quality of life sub-scale of the KOOS and visual analog scale (VAS) severity at the 6-month follow-up. The Tegner activity score and VAS frequency were not significantly different between the two groups. Graft failure was not observed on magnetic resonance imaging at the 24-month follow-up. m-AMI and m-ACI demonstrated very good-to-excellent and good-to-very good infill, respectively, with no adverse effects from the implant, regardless of the treatment. For the treatment of isolated full-thickness chondral lesion of the knee, m-AMI can be used effectively and may potentially accelerate recovery. A larger patient cohort and follow-up supported by histological analyses are necessary to determine long-term outcomes.
    Archives of Orthopaedic and Trauma Surgery 12/2014; 135(2). DOI:10.1007/s00402-014-2136-z · 1.36 Impact Factor
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    ABSTRACT: BACKGROUND: Behçet's syndrome (BS) is a well-recognized cause of Budd-Chiari syndrome (BCS); however, information about its clinical characteristics and outcome is limited. METHODS: We reviewed the records of about 9000 patients with BS registered at the multidisciplinary Behçet's syndrome outpatient clinic at Cerrahpasa Medical Faculty between July 1977 and October 2013. We identified 43 (40 M/3 F) patients who were diagnosed as having BCS. Their outcome was evaluated between September 2012 and October 2013. RESULTS: In total, 33 patients (77%) had presented with liver-related symptoms (Group I), while 10 (23%) were asymptomatic for liver disease (Group II). This latter group had presented with symptoms related to the presence of major vessel disease such as fever, leg swelling, or dyspnea. The site of venous obstruction determined in 41 patients was inferior vena cava (IVC) and hepatic veins combined in 25 (61%), IVC alone in 12 (29%), and only hepatic veins in 4 patients (10%). The number of patients with concurrent obstruction in the hepatic veins and the IVC was less in Group II than in Group I (3/10 vs 22/31, p = 0.06). A total of 20 (19 M/1 F) patients (47%) had died at a median of 10 months after diagnosis. Mortality was significantly lower in Group II (10%) than in Group I (58%), (p = 0.011). By the end of the survey, 23 patients were alive, of whom 21 could be re-evaluated at the clinic. CONCLUSIONS: BCS associated with BS is usually due to IVC thrombosis with or without hepatic vein thrombosis. Silent cases exist and have a better prognosis. The mortality rate among the patients symptomatic for liver disease remains high.
    Seminars in Arthritis and Rheumatism 12/2014; DOI:10.1016/j.semarthrit.2014.10.014. · 3.63 Impact Factor
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    ABSTRACT: To evaluate the effect of ShearWave™ elastography (SWE) for the assessment of liver fibrosis after radioembolization (RE) in patients with liver malignancies. We prospectively examined the effects of SWE before and after RE in 17 adult patients, from June 2012 to September 2013. All patients underwent SWE within 1 month before and 3 months (96.3 ± 22.9 days) after RE. Measurements were taken in segments III, IV, V, and VI (lateral/medial left lobe and anterior/posterior right lobe, respectively). Liver stiffness was studied in the 39 treated segments. The mean stiffness of liver tissue according to the pre-RE SWE measurements was not different from the post-RE SWE measurements in the segments that did not undergo RE. Conversely, segments treated with RE were significantly stiffer according to the post-RE SWE measurements (mean SWE 17.4 kPa) than according to the baseline measurements (7.0 kPa) (p < 0.001). Patients with hepatocellular carcinoma and preexisting infection with hepatitis B and C viruses had higher pre-embolization stiffness, and the post-embolization stiffness of the treated segments in these patients was higher than that in the remainder of the study population. These data suggest that SWE measurements of liver stiffness increase as early as the third month after RE. SWE could be used as a noninvasive complementary imaging method for preliminary assessment of liver fibrosis before and after RE.
    CardioVascular and Interventional Radiology 11/2014; DOI:10.1007/s00270-014-1021-z · 1.97 Impact Factor
  • Fatih Kantarci, Emire Seyahi
    Clinical and experimental rheumatology 09/2014; 32 Suppl 84(4):7-8. · 2.97 Impact Factor
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    ABSTRACT: Aims and background. There is limited data regarding outcomes of Ewing's sarcoma family of tumors in adolescents and adults compared with the same tumors in childhood. The aim of the study was to analyze prognostic factors and treatment results in a cohort of adolescents and adults with non-metastatic skeletal Ewing's sarcoma family of tumors. Methods and study design. From 1992-2008, 90 adolescents and adults with Ewing's sarcoma family of tumors of the bone were referred to our institution. Sixty-five (72%) non-metastatic patients with analyzable data and treated in our institution were retrospectively evaluated. All patients were treated with alternated chemotherapy regimens administered every 3 weeks. The local treatment modality was selected according to tumor and patient characteristics. Results. The median age was 21 years (range, 13-50). Most patients (74%) were >17 years of age. Forty-six percent of the tumors were located in the extremities. Local therapy was surgery in 45 patients and radiotherapy alone in 19 patients. Twenty-one patients received preoperative and 13 patients postoperative radiotherapy. Median follow-up was 43 months (range, 7-167). The 5-year event-free and overall survival rates for all patients were 44% and 49%, respectively. On univariate survival analysis, event-free and overall survival were worse for patients >17 years of age, tumor size >8 cm in diameter, an axial location, positive surgical margins, and poor histopathological response (<90% necrosis). Age, tumor site and tumor size on event-free and overall survival remained significant on multivariate analysis.Conclusions. We identified age, tumor size, and tumor site as independent prognostic factors, in accord with the Western literature. These patients require novel treatment modalities.
    Tumori 07/2014; 100(4):452-8. DOI:10.1700/1636.17910 · 1.09 Impact Factor
  • Revista Española de Medicina Nuclear e Imagen Molecular 05/2014; DOI:10.1016/j.remn.2014.03.005 · 0.86 Impact Factor
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    ABSTRACT: The malignant parotid lesions are fast growing and rapidly become symptomatic. Ultrasonography and fine needle aspiration biopsy are mainly used in the differential diagnosis of parotid lesions. The most common treatment of all parotid lesions is surgical excision. Here, we present a case of a very rapidly enlarging, painful parotid lesion with no etiology. A 30-year-old man presented with a rapidly progressive, enlarging, painful mass on the left side of the parotid region. The size of the lesion had enlarged rapidly day by day. The patient had no history of head and neck surgery or trauma. After evaluation of the patient with radiologic examinations, no certain diagnosis could be made; we thought that the patient might be experiencing spontaneous intraparotid bleeding with unknown etiology. We decided to wait for a time for spontaneous resolution. The lesion resolved spontaneously in a few months, without any complications or sequelae.
    The Journal of craniofacial surgery 05/2014; 25(3):e244-5. DOI:10.1097/SCS.0000000000000545 · 0.68 Impact Factor
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    ABSTRACT: Objectives- The purpose of this study was to evaluate whether the relative proportions of stromal to cellular components of pleomorphic adenomas have an effect on the shear elastic modulus determined by shear wave elastography (SWE). Methods- This study was approved by the Ethics Committee of our institution and performed between September 2011 and December 2012. Thirty-five patients who underwent surgery for a parotid mass were included in the study. The maximum shear elastic modulus of the mass was measured by SWE. Pleomorphic adenomas were histopathologically subdivided into stroma-poor, intermediate-stroma, and stroma-rich tumors based on the relative proportion of stromal to cellular components. Results- The maximum shear elastic modulus values of the pleomorphic adenomas ranged from 12.6 to 291.9 kPa (mean ± SD, 120.9 ± 92.8 kPa). The Friedman test revealed a statistically significant relationship between the stromal amount and maximum shear elastic modulus (P < .001). Stroma-poor adenomas (mean, 32.3 ± 27.7 kPa; range, 12.6-81.1 kPa) were softer on SWE than stroma-rich adenomas (mean, 174.1 ± 48.4 kPa; range, 92.7-217.2 kPa; P = .009). No such significant difference was detected between stroma-poor and intermediate-stroma tumors (mean, 146.3 ± 106.1 kPa; range, 19.1-291.9 kPa; P = .062) or between intermediate-stroma and stroma-rich tumors (P = .465). Conclusions- Shear wave elastography depicts pleomorphic adenomas with a variable appearance, which is due to the relative proportions of stromal to cellular contents in the tumors.
    Journal of ultrasound in medicine: official journal of the American Institute of Ultrasound in Medicine 03/2014; 33(3):503-8. DOI:10.7863/ultra.33.3.503 · 1.53 Impact Factor
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    ABSTRACT: Background: To assess the long term clinical outcome of preoperative radiotherapy with or without chemotherapy followed by limb sparing surgery in patients with non-metastatic soft tissue sarcomas (STS) of the extremities. Materials and Methods: Sixty patients with locally advanced STS were retrospectively analyzed. The median tumor diameter was 12 cm. All patients were treated with preoperative radiotherapy delivered with two different fractionation schedules (35Gy/10fr or 46-50Gy/23-25fr). Neoadjuvant chemotherapy was added to 44 patients with large and/or high grade tumors. Surgery was performed 2-6 weeks after radiotherapy. Chemotherapy was completed up to 6 courses after surgery in patients who had good responses. Results: Median follow-up time was 67 months (8-268 months). All of the patients had limb sparing surgery. The 5-year local control (LC), disease free (DFS) and overall survival (OSS) rates for all of the patients were 81%, 48.1% and 68.3% respectively. 5-year LC, DFS and cause specific survival (CSS) were 81.7%, 47%, 69.8%, and 80%, 60%, 60% in the chemoradiotherapy and radiotherapy groups, respectively. On univariate analysis, patients who were treated with hypofractionation experienced significantly superior LC, DFS and CSS rates with similar rates of late toxicity when compared with patients who were treated with conventional fractionation and statistical significance was retained on multivariate analysis. Conclusions: Treatment results are consistent with the literature. As neoadjuvant chemoradiotherapy provides effective LC and CSS with acceptable morbidity, it should be preferred for patients with large and borderline resectable STS.
    Asian Pacific journal of cancer prevention: APJCP 02/2014; 15(4):1775-1781. DOI:10.7314/APJCP.2014.15.4.1775 · 1.50 Impact Factor
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    ABSTRACT: Shear-wave elastography (SWE) is a novel non-invasive method that involves applying local mechanical compression on soft tissue using focused ultrasonography (US) and acquiring strain images that show tissue response. In this study, our goal was to assess the performance of SWE in the staging of liver fibrosis in children with chronic liver disease. The study involved measuring SWE values in the right lobe of the liver in a patient group of 76 children with chronic liver disease and a control group of 50 healthy subjects. In the patient group, the shear elastic modulus values were correlated with biopsy results according to the Brunt scoring system (F0: portal fibrosis, F1: perisinusoidal or portal/periportal fibrosis, F2: both perisinusoidal and portal/periportal fibrosis, F3: bridging fibrosis and F4: cirrhosis). Performance of SWE in estimating liver fibrosis in children was determined based on a receiver-operating characteristics (ROC) analysis. Mean SWE values of the control group and F0 group were not statistically significantly different (p = 0.106). The mean SWE values of the F1, F2, F3, and F4 groups were higher than that of the control group (all p < 0.001). Based on kPa measurement values, the area under the ROC curve was 95.2% (95% CI = 92.1-99.5%) with a sensitivity for diagnosing liver fibrosis of 91.5%, a specificity of 94.0%, a positive predictive value of 93.1%, and a negative predictive value of 92.6%. Based on m/s measurement values, the area under the ROC curve was 96.3% (95% CI = 92.7-99.8%) with a sensitivity for diagnosing liver fibrosis of 93.2%, a specificity of 94.0%, a positive predictive value of 93.2%, and a negative predictive value of 94.0%. Mean SWE values for patients with non-alcoholic steatohepatitis (NASH) were higher than those in the remainder of the study group. Although liver fibrosis can be detected using SWE, differentiation of fibrosis stages could not be achieved. The presence of steatosis significantly increased the mean SWE values on elastography and so care should be taken when assessing children with NASH.
    Journal of pediatric gastroenterology and nutrition 02/2014; DOI:10.1097/MPG.0000000000000329 · 2.87 Impact Factor
  • Annals of the Rheumatic Diseases 01/2014; 72(Suppl 3):A641-A642. DOI:10.1136/annrheumdis-2013-eular.1904 · 9.27 Impact Factor
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    ABSTRACT: Intussusception is the most frequent complication of Peutz-Jeghers Syndrome (PJS), but usually seen in child age. It is a predictable, but infrequent complication in adults with PJS. However, there is no report about intussusception in pregnancy period secondary to Peutz-Jeghers (PJ) polyps in the literature. In this paper, we present a rare intussusception case in a pregnant woman with PJS, which was diagnosed with magnetic resonance imaging, and discuss this condition with a brief literature review.
    Scottish medical journal 01/2014; 59(1). DOI:10.1177/0036933013519028 · 0.54 Impact Factor
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    ABSTRACT: A case of acute mesenteric ischemia due to thrombosis of superior mesenteric artery and vein in a 44-year-old woman following chemotherapy for invasive laryngeal carcinoma was diagnosed on a multi-detector CT scan. Although the link between malignancy and thromboembolism is widely recognized in patients with cancer, chemotherapy further elevates the risk of thrombosis. Acute mesenteric ischemia associated or not associated with chemotherapy rarely occurs in patients with cancer. Moreover, co-occurrence of superior mesenteric artery and superior mesenteric vein thrombosis is reported for the first time.
    Japanese journal of radiology 01/2014; DOI:10.1007/s11604-013-0273-x · 0.74 Impact Factor
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    ABSTRACT: Meckel's diverticulum is the most common congenital anomaly of the small intestine. Common complications related to a Meckel's diverticulum include hemorrhage, intestinal obstruction, and inflammation. Small bowel obstruction due to mesodiverticular band of Meckel's diverticulum is a rare complication. Herein, we report a case of small bowel obstruction occurring due to mesodiverticular band of a Meckel's diverticulum. The important aspect of our case is clear demonstration of the mesodiverticular band adjacent to the Meckel's diverticulum on pre-operative computed tomography (CT).
    JBR-BTR: organe de la Société royale belge de radiologie (SRBR) = orgaan van de Koninklijke Belgische Vereniging voor Radiologie (KBVR) 01/2014; 97(1):25-7.
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    ABSTRACT: A patient with a 2-year history of pain in the left arm, and decreased strengths unrelieved by non-steroidal anti-inflammatory therapy, was being referred for repeating radiography. The radiologic examinations have demonstrated a unique pattern of non-contiguous osteolysis in the left elbow, proximal and distal radius, ulna, wrist, carpal bones, proximal and distal metacarpals and phalanges. Multi-site biopsies were being performed and confirmed the diagnosis of massive osteolysis. To our knowledge, this is the first case in which multifocal, non-contiguous osteolysis with skip lesions without associated nephropathy and without a hereditary pattern is being described in one extremity.
    Korean journal of radiology: official journal of the Korean Radiological Society 11/2013; 14(6):946-950. DOI:10.3348/kjr.2013.14.6.946 · 1.81 Impact Factor
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    ABSTRACT: To measure the median nerve (MN) stiffness by quantitative shear wave elastography (SWE) at the carpal tunnel inlet and to determine whether SWE can be used in the diagnosis of carpal tunnel syndrome (CTS). The study included 37 consecutive patients (60 wrists) with a definitive diagnosis of CTS and 18 healthy volunteers (36 wrists). The MN cross-sectional area (CSA) by ultrasound and stiffness by SWE were studied. The difference between CTS patients and controls, and the difference among subgroups based on electrodiagnostic tests were studied by the Student's t test. Interobserver variability and ROC analysis were performed. The MN stiffness was significantly higher in the CTS group (66.7 kPa) when compared to controls (32.0 kPa) (P < 0.001), and higher in the severe or extreme severity group (101.4 kPa) than the mild or moderate severity group (55.1 kPa) (P < 0.001). A 40.4-kPa cut-off value on SWE revealed sensitivity, specificity, PPV, NPV and accuracy of 93.3 %, 88.9 %, 93.3 %, 88.9 % and 91.7 %, respectively. Interobserver agreement was excellent for SWE measurements. Median nerve stiffness at the carpal tunnel inlet is significantly higher in patients with carpal tunnel syndrome, for whom shear wave elastography appears to be a highly reproducible diagnostic technique. • Clinical examination is important for diagnosis of carpal tunnel syndrome • Shear wave elastography (SWE) offers new clinical opportunities within diagnostic ultrasound • SWE is highly reproducible in evaluation of median nerve stiffness • Median nerve stiffness is significantly increased in carpal tunnel syndrome • Elastography could become useful in diagnosis of carpal tunnel syndrome.
    European Radiology 09/2013; 24(2). DOI:10.1007/s00330-013-3023-7 · 4.34 Impact Factor
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    ABSTRACT: We conducted a prospective study to evaluate the vertebrobasilar system in adults with and without obstructive sleep apnea (OSA). Our study population was made up of 48 patients with OSA and 21 healthy volunteers who served as controls; the OSA patients were subdivided into one group with mild or moderate OSA (n = 22) and another with severe OSA (n = 26). Each participant underwent Doppler ultrasonography three times to measure the diameter of the vertebral artery, the peak systolic velocity (PSV), the resistive index (RI), and the vertebral artery flow volume; the mean of the three measurements was calculated for each patient, for the OSA and control groups, and for various subgroups. No significant differences in vessel diameter, PSV, or RI were seen among any of the subgroups. Overall, the vertebral artery flow volume was slightly, but not significantly, higher in all patients with OSA (206 ml/min) than in the control group (177 ml/min); this difference might reflect the body's daytime response to the chronic apneic events experienced during sleep. The only statistically significant difference we found was in vertebral artery flow volume between the controls and the subgroup with mild or moderate OSA (p = 0.026); no difference was seen between the controls and the patients with severe OSA (p = 0.318). Likewise, no significant difference in any of the four parameters was seen when patients were subclassified by body mass index and arterial oxygen saturation level.
    Ear, nose, & throat journal 08/2013; 92(8):E25-30. · 0.88 Impact Factor
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    Open Journal of Internal Medicine 05/2013; 3(2):60-62. DOI:10.4236/ojim.2013.32015
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    ABSTRACT: Segmental testicular infarction (STI) is a rare cause of acute scrotum. The spectrum of findings on gray-scale and color Doppler ultrasonography differ depending on the time between the onset of testicular pain and the ultrasonography examination. We are not aware of the usefulness of shear-wave elastography for the diagnosis of STI. We report the shear-wave elastography features in a case of STI and discuss the role of this diagnostic modality in the differential diagnosis.
    Korean journal of radiology: official journal of the Korean Radiological Society 11/2012; 13(6):820-2. DOI:10.3348/kjr.2012.13.6.820 · 1.81 Impact Factor

Publication Stats

761 Citations
291.28 Total Impact Points

Institutions

  • 2001–2014
    • Istanbul University
      • • Department of Radiology
      • • Department of General Surgery
      İstanbul, Istanbul, Turkey
  • 2004
    • Abant İzzet Baysal Üniversitesi
      Claudiopolis, Bolu, Turkey
  • 2003
    • Istanbul Surgery Medical Center
      İstanbul, Istanbul, Turkey