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Öğe Computed Tomographic and Magnetic Resonance Imaging Findings of Asymptomatic Intra-Abdominal Gastrointestinal System Lipomas(Lippincott Williams & Wilkins, 2008) Genchellac, Hakan; Demir, Mustafa K.; Ozdemir, Huseyin; Unlu, Ercument; Temizoz, OsmanLipomas are common benign mesenchymal neoplasms documented in literature. This study aimed to describe the computed tomographic (CT) and magnetic resonance imaging (MRI) findings of gastrointestinal system lipomas, all of which are incidentally found in routine abdominal imaging studies. Lipomas were depicted as homogeneous, nonenhancing, well-marginated lesions consistent with adipose tissue on CT and MRI The density measurements on CT images consistent with fat are virtually diagnostic. Lipomas can incidentally be found and should be considered in the differential diagnosis of soft tissue gastrointestinal system-related masses. Computed tomographic or MRI examinations can correctly diagnose a lipoma nonoperatively, thereby allowing better treatment planning..Öğe Computerized Tomography Patterns of Mediastinal Lymphadenopathy(Galenos Yayincilik, 2010) Altunrende, S. Sevil; Demir, M. Kemal; Anik, Yonca Akgoz; Ozdemir, HuseyinAim: The aim of our study is to demonstrate the efficiency of computerized tomography (CT) in determining the etiology of mediastinal lymphadenopathy detected on thoracic CT by evaluating its dimension, location, number, enhancing pattern and structure of the parenchyma. Methods: Ninety-six subjects, 73 men and 23 women, who were referred to our clinic with various initial diagnoses and whose thorax CT examination revealed mediastinal lymphadenopathy, were included in the study. Results: Among the patients divided into 5 groups according to the etiology of the mediastinal LAP, statistically significant difference was found when comparing the third group with the first and the second groups in terms of the presence or absence of lymph node calcification. Significant difference was observed between the first group and the second group regarding the lymph node dimensions. No statistically significant difference was found between the groups in terms of the presence of lymph nodes packet. Conclusion: CT is an effective imaging method for evaluating the dimension, location, number, enhancing pattern and the structure of parenchyma of mediastinal lymphadenopathy, for staging, and for following after operation or medication.Öğe CT-angiographic demonstration of hepatic collateral pathways due to superior vena cava obstruction in Behcet disease(Turkish Soc Radiology, 2010) Temizoz, Osman; Genchellac, Hakan; Yekeler, Ensar; Demir, Mustafa Kemal; Unlu, Ercument; Ozdemir, HuseyinBehcet disease (BD) is a chronic multisystemic inflammatory disorder, mainly characterized by recurrent oral and genital ulcers, skin lesions, and uveitis. Large vein thrombosis in BD is unusual; when present, it is most frequently seen in the inferior or superior vena cava (SVC). The authors describe an unusual hepatic pseudolesion caused by abnormal focal enhancement through collateral pathways to the liver in two BD patients with SVC occlusion on three-dimensional multi-detector computed tomography, using volume rendering and maximum intensity projection techniques. BD should be suspected in patients presenting a focal increased hepatic enhancement area with collaterals caused by occlusion of the SVC without evidence of a hypercoagulable state or malignant mediastinal or thoracic venous inlet obstruction.Öğe Dermatofibroma mimicking malignancy on integrated F-18 fluorodeoxyglucose PET-CT(Turkish Soc Radiology, 2009) Demir, Mustafa Kemal; Ozdemir, Huseyin; Genchallac, Hakan; Altaner, Semsi; Kartal, OezcanA 31-year-old female with a history of ovarian cancer underwent an F-18 fluorodeoxyglucose (FDG) positron emission tomography-computed tomography (PET-CT) scan. The PET-CT demonstrated focal nodular uptake in the subcutaneous tissue of the back adjacent to the paraspinal muscles. Color Doppler ultrasonography examination demonstrated a vascular solid mass. The patient underwent biopsy followed by excision. The pathologic diagnosis was dermatofibroma. Although benign, dermatofibromas can have intense FDG uptake.Öğe Differential diagnosis of spinal epidural meningioma and hemangioma at MR imaging(Radiological Soc North America, 2007) Demir, Mustafa Kemal; Ozdemir, Huseyin; Unlu, Ercument; Temizoez, Osman; Genchellac, Hakan[Abstract Not Available]Öğe Hypothenar hammer syndrome(John Wiley & Sons Inc, 2008) Genchellac, Hakan; Demir, Mustafa Kemal; Unlu, Ercuement; Temizoz, Osman; Ozdemir, HuseyinWe report a case of hypothenar hammer syndrome following a single severe blunt trauma in a 24-year-old man with a painful pulsatile mass, numbness in the fourth and fifth fingers, and intolerance to cold. The gray-scale and color Doppler sonographic findings are presented with correlation with MRI. (C) 2007 Wiley Periodicals, Inc.Öğe Perineal angiomyxomas: Can a differential diagnosis be made with imaging studies?(Radiological Soc North America (Rsna), 2007) Demir, Mustafa Kemal; Genchellac, Hakan; Ozdemir, Huseyin[Abstract Not Available]Öğe Phase inversion harmonic imaging improves assessment of renal calculi(John Wiley & Sons Inc, 2008) Ozdemir, Huseyin; Demir, Mustafa Kemal; Temizoz, Osman; Genchellac, Hakan; Unlu, ErcumentPurpose. To compare phase inversion harmonic imaging (PIHI) with fundamental imaging (FI) in the evaluation of renal calculi. Methods. Thirty adult patients with renal calculi (17 men, 13 women; mean age 44 years [range, 25-71]) underwent transabdominal sonographic examination of the urinary system. Both kidneys and renal calculi were examined with PIHI and A. Overall renal con picuity, calculus visibility, and clarity of posterior shadowing were assessed subjectively using a 4-point scale (0 being the worst, 3 being the best). The maximum diameter of the calculi was measured using both techniques. The effect of body mass index on qualitative scoring and quantitative measurements was evaluated. Results. PIN improved overall renal conspicuity compared with A (p < 0.001). The visibility of the calculi and clarity of posterior shadowing were significantly better with PIHI than with A (p, < 0.001 for both parameters). The maximum diameter of calculi was larger with PIHI than with FI (p < 0.001). The superiority of PIHI over FI regarding overall conspicuity of the kidney, visibility of the calculus, and clarity of posterior shadowing scores increased in the obese group (p < 0.001 for all 3 parameters). The mean calculus diameter difference between the 2 techniques was significantly higher in the obese group. Conclusion. The routine use of PIHI is recommended in the evaluation of renal calculi. (c) 2007 Wiley Periodicals, Inc.Öğe Prevalence and MDCT characteristics of asymptomatic Bochdalek hernia in adult population(Turkish Soc Radiology, 2010) Temizoz, Osman; Genchellac, Hakan; Yekeler, Ensar; Umit, Hasan; Unlu, Ercument; Ozdemir, Huseyin; Demir, M. KemalPURPOSE To determine the frequency of asymptomatic incidental Bochdalek hernias in adults, using multidetector computed tomography (MDCT), and to ascertain any possible relationship between Bochdalek hernia and age, gender, or body mass index (BMI). MATERIALS AND METHODS Seven hundred and forty-eight abdominal, and 602 chest MDCT scans, which had been performed for a variety of reasons on 1350 adults, were investigated retrospectively. Location and size of Bochdalek hernias seen on these scans were correlated with age, gender, and BMI. On the basis of BMI, patients with Bochdalek hernia were classified as group A (BMI <25) and group B (BMI >= 25). RESULTS A total of 171 Bochdalek hernias were identified in 142 of 1350 patients, ranging in age from 25 to 90 years (median age, 57.2), representing a prevalence of 10.5%. Sixty left-sided unilateral Bochdalek hernias (42.2%), 53 (37.4%) right-sided unilateral Bochdalek hernias, and 29 (20.4%) bilateral Bochdalek hernias were detected. Forty-five (31.6%) were categorized as small, 82 (57.8%) were medium-sized, and 1 5 (10.5%) were large. BMI was <25 in 62 patients (43.7%), and >= 25 in 80 patients (56.3%). Fourteen patients (9.9%) were young adults, while 86 (60.6%) were middle aged, and 42 (29.6%) were elderly. No statistically significant relationship was found between dimensions or hernia locations and age, gender, or BMI of patients with Bochdalek hernia. CONCLUSION In view of the high prevalence of Bochdalek hernia in our study (10.5%), the multiplanar and reconstruction features of MDCT seem to facilitate the diagnosis of asymptomatic incidental Bochdalek hernia. No relationship was found between asymptomatic incidental Bochdalek hernia and age, gender, or BMI in adults.Öğe The relationship between magnetic resonance Imaging findings and postural Maneuver and physical examination tests in patients with thoracic outlet syndrome: Results of a double-blind, controlled study(W B Saunders Co-Elsevier Inc, 2007) Demirbag, Derya; Unlu, Ercument; Ozdemir, Ferda; Genchellac, Hakan; Temizoz, Osman; Ozdemir, Huseyin; Demir, KemalObjectives: To investigate the differences in findings from magnetic resonance imaging (MRI) in the neutral and provocative positions, and to examine the relationship between these differences and the results of physical examination tests in patients with thoracic outlet syndrome (TOS). Design: Prospective. Setting: University physical medicine and rehabilitation outpatient and radiology clinics. Participants: Twenty-nine patients and 12 healthy controls. All of the patients had positive bilateral TOS stress tests; control group participants were symptom free and had negative TOS stress tests bilaterally. Interventions: Not applicable. Main Outcome Measures: All participants underwent Adson's test, the Halsted maneuver, and a hyperabduction test. All were evaluated with MRI while in 2 positions: the neutral position (upper extremities adducted) and in a provocative position. Measurements were obtained at the interscalene triangle, at the costoclavicular space, and at the retropectoralis minor space. Results: There was a significant difference in MRI findings between the neutral and provocative position in the patient (P<.05), but there were no significant differences in the control group. There was a significant difference in the positional change values in MRI between the patients and the control subjects (P<.05). The difference was found in the minimum costoclavicular distance between patients with a positive Halsted maneuver and a negative Halsted maneuver (P<.05). Conclusions: Our findings indicate that MRI findings in patients in a provocative position are more valuable in the diagnosis of TOS, and these findings are in accord with findings from the physical evaluation tests.Öğe The results of computed tomography guided tru-cut transthoracic biopsy: complications and related risk factors(Springer Wien, 2011) Besir, Fahri Halit; Altin, Remzi; Kart, Levent; Akkoyunlu, Muhammed; Ozdemir, Huseyin; Ornek, Tacettin; Gundogdu, SadiIntroduction: Transthoracic biopsy (TTB) is a well-defined and effective method used for pathologic sampling in the diagnosis of the pulmonary lesions. It is less invasive in comparison to surgical procedures. In addition, diagnostic rate of tru-cut biopsy is higher than that of fine needle aspiration biopsy (FNAB) especially for benign lesions. In this study, we presented tru-cut transthoracic biopsy (TTB) procedure results and the frequency of TTB complications with related risk factors. Material and methods:A total of 102 patients were evaluated by CT scan guided tru-cut TTB in the diagnosis of lung lesions between January 2003 and December 2007. The complications due to tru-cut TTB were recorded. The factors such as the lesion depth, the lesion size, and the emphysematous changes that accompany the lesion were evaluated through chi(2) test. Results: Among the samples, 51% malignancy and 49% benign pathology were observed. Pneumothorax developed in 15.7% of the 102 procedures. It was found that the lesion's distance from the pleura, the size of the lesion, and emphysematous changes around the lesion significantly increased the risk of pneumothorax. Discussion: The tru-cut biopsy complications are similar to those of FNAB. In the centers where cytologic examination is insufficient in the diagnosis of lung lesions, tru-cut biopsy should be routinely performed as it is a reliable biopsy technique compared to FNAB.
