Sezgin Guvel
Başkent University
Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by Sezgin Guvel.
Urologia Internationalis | 2005
Mir Ali Pourbagher; Ferhat Kilinc; Sezgin Guvel; Aysin Pourbagher; Tulga Egilmez; Hakan Ozkardes
Introduction: To demonstrate the relationship between testicular microlithiasis and testicular tumor development. Patients and Methods: Between January 1996 and March 2004, bilateral testicular microlithiasis was found in 40 of the 5,263 patients who underwent scrotal ultrasonography yielding a prevalence of 0.76%. Of the 40 patients, 4 patients with concomitant testicular tumors were excluded from the study. The remaining 36 patients were enrolled into the study and followed by ultrasonography at 6-month intervals. Results: Patient ages ranged between 1 and 69 years (mean 31 ± 14 years). The median ultrasonography follow-up was 34 months (range, 1–96). Testicular tumor development was not observed in any of these 36 patients during the follow-up period. Conclusions: Extensive evaluation including computerized tomography, testicular tumor markers and testicular biopsyof patients with testicular microlithiasis is unnecessary and also increases patient anxiety. Yet annual ultrasonography and physical examination should be performed if ever until testicular microlithiasis is completely accepted as a nonpremalignant disease.
International Journal of Urology | 2003
Sezgin Guvel; Ferhat Kilinc; Fazilet Kayaselcuk; Ilhan Tuncer; Hakan Ozkardes
Emphysematous pyelonephritis is an uncommon and life‐threatening infection of the kidney that is characterized by gas formation within or around the kidney and is associated with diabetes mellitus and urinary tract infection. Amoebiasis is a protozoal infection caused by Entamoeba histolytica. In its invasive forms, the disease is characterized by visceral abscess formations. We present a case of concomitant emphysematous pyelonephritis and renal amoebiasis in a 42‐year‐old female with uncontrolled diabetes mellitus. The patient did not respond well to initial supportive treatment and antibiotherapy. Therefore, nephrectomy was performed. She did extremely well after the operation and was discharged with antidiabetics and antibiotics.
Urologia Internationalis | 2006
Tulga Egilmez; Mir Ali Pourbagher; Sezgin Guvel; Ferhat Kilinc; Tahsin Turunc; Hakan Ozkardes
Introduction: This study was undertaken to investigate the effects of two different α1-adrenergic blockers on bladder hypertrophy using ultrasound-estimated bladder weight (UEBW) and to assess the relation between changes in UEBW and other objective and subjective parameters of disease severity in patients with benign prostatic hyperplasia (BPH). Materials and Methods: 41 men were enrolled in the study and they were subjected to either watchful waiting (group 1) or α1-adrenergic receptor blocker therapy (group 2 with alfuzosin; group 3 with tamsulosin). The patients were investigated by symptom evaluation using the International Prostate Symptom Score (IPSS) and quality of life score (QOL), uroflowmetry and UEBW. The parameters were assessed again 3 months after initiation of treatment and compared with the initial values. Results: While the mean UEBW increased in group 1 (42.2 ± 10.3 to 52.5 ± 12.2 g), it decreased in both the other groups that received α-blocker therapy (61.3 ± 18.7 to 41.1 ± 13.2 and 59.4 ± 17.2 to 43.5 ± 17.6 g, respectively). In groups 2 and 3, the mean UEBW, post-void residual urine, IPSS and QOL values decreased, and the mean maximum flow rate increased. All of the changes in group 2 and all except QOL in group 3 were statistically significant (p < 0.05). The changes correlated well with each other with regard to treatment success. The highest decreases in UEBW were encountered in patients with heavier bladders. Conclusions: UEBW decreases with α1-adrenergic receptor blockers. When used together with the other objective and subjective parameters, UEBW is a promising quantitative parameter as a follow-up tool and can be useful in monitoring the therapeutic effects of α1-adrenergic receptor blockers.
Urologia Internationalis | 2005
Sezgin Guvel; Rıza Türköz; Tulga Egilmez; Ferhat Kilinc; Ozgur Yaycioglu; Hakan Atalay; Hakan Ozkardes
Objective: This study sought to investigate whether ischemia-induced prostate damage during cardiac surgery involving cardiopulmonary bypass causes bladder outlet obstruction. Materials and Methods: The study involved 37 men who underwent elective cardiac surgery involving cardiopulmonary bypass. Prostate-specific antigen (PSA) levels were determined preoperatively (baseline) and on postoperative days 1, 5, and 30. In 4 cases, the PSA level after the operation was unchanged from the preoperative level, so these 4 men were excluded from the study. In the remaining 33 patients, symptoms of bladder outlet obstruction were assessed using the International Prostate Symptom Score. Each subject completed this test preoperatively and 3, 6 and 9 months postoperatively, and the means scores at these time points were compared. The effects of patient age, operative time, CPB time, and aortic clamping time on postoperative increases in PSA levels were investigated. Results: Thirty-three (89.2%) of the 37 men exhibited increased postoperative PSA levels compared to baseline. The mean PSA level for the 33 cases on day 5 was significantly higher than the baseline mean, but the mean levels on postoperative days 1 and 30 were comparable to baseline. Nine (24.3%) of the 33 men had postoperative PSA levels greater than 4.0 ng/dl (the upper normal limit). There was no significant difference between preoperative and postoperative International Prostate Symptom Scores. Conclusion: The study indicates that men’s PSA levels are, indeed, increased after cardiac surgery with cardiopulmonary bypass. However, in 9 months of follow-up, there was no association between this PSA rise and development of BOO, according to International Prostate Symptom Scores.
International Journal of Urology | 2003
Mir Ali Pourbagher; Sezgin Guvel; Aysin Pourbagher; Ferhat Kilinc
Intratesticular varicocele is a rare entity and describes dilated intratesticular veins radiating from the mediastinum testis into the testicular parenchyma. Scrotal ultrasonography of two patients who presented to our urology clinic due to left scrotal pain revealed multiple tubular structures in the testes with diameters of more than 2 mm. Duplex spectral analysis showed a reversed flow response to Valsalvas maneuver. Apropos of two cases, intratesticular varicocele is reviewed.
International Journal of Urology | 2004
Dalokay Kiliç; Ferhat Kilinc; Ali Ezer; Sezgin Guvel
Abstract The rare clinical occurrence of the spontaneous passage of bullet which was not found during an operation after a gunshot wound to the bladder in a 28‐year‐old man is described.
International Journal of Urology | 2003
Ferhat Kilinc; Tayfun Bagis; Sezgin Guvel; Tulga Egilmez; Hakan Ozkardes
Vesicouterine fistula without vaginal leakage of urine, cyclic hematuria and amenorrhea is a rare condition, referred to as Youssefs syndrome. The most common cause of this syndrome is trauma during a cesarean section. Herein a new case is reported.
Urologia Internationalis | 2007
Ozgur Yaycioglu; Serife Ulusan; Ali Ezer; Sezgin Guvel
A case of gossypiboma (retained surgical sponge) is described which caused ureteroappendiceal fistula 4 years after an open right ureterolithotomy operation. The patient was treated by removal of the retained sponges, appendectomy and ureteral stent insertion.
Pathology Research and Practice | 2003
Fazilet Kayaselcuk; Nebil Bal; Sezgin Guvel; Tulga Egilmez; Ferhat Kįlįnc; Ilhan Tuncer
Both squamous cell carcinoma and carcinosarcoma of the renal pelvis are uncommon. We report on two cases, one carcinosarcoma and one squamous cell carcinoma of the renal pelvis. In the patient with squamous cell carcinoma of the left kidney, the tumor was neither detectable on preoperative radiological evaluation nor grossly visible in the surgical specimen. This patient, a 56-year-old man, presented with left lumbar pain, hematuria, fever, 4-5 kg weight loss, and untreated nephrolithiasis of the left kidney that had been diagnosed 20 years earlier. The second patient, an 87-year-old woman, also had a long history of left kidney nephrolithiasis and presented with left lumbar pain and hematuria. Both patients underwent nephrectomy for removal of the non-functioning hydronephrotic left kidney. In both cases, microscopic examination of the surgical specimen revealed squamous metaplasia and dysplasia in the pelvicalyceal mucosa, and islands of atypical squamous cells in the renal parenchyma. In the second case, the kidney also showed sarcomatous changes in the pelvis.
International Braz J Urol | 2005
Tulga Egilmez; Sezgin Guvel; Ferhat Kilinc; Ozgur Yaycioglu; Hakan Ozkardes
INTRODUCTION The traditional delayed treatment of iatrogenic complete ureteral obstruction is open surgery. An easy endourological technique, transluminal re-canalization of the ureter by guide-wire puncture under fluoro-endoscopic control, which has been performed on 4 patients, is described. SURGICAL TECHNIQUE With the guidance of C-arm fluoroscopy, by moving the C-arm to different planes, the tip of the ureteroscope is directed to the correct plane to meet the obliterated proximal end of the ureter and under direct vision, transluminal puncture is performed using the stiff end of a 0.035-inch guide wire. Once the stiff end of the guide-wire is in the lumen of the proximal ureter, an ureteral catheter is introduced over the guide wire, the guide wire is then removed and reinserted through the ureteral catheter with its soft end leading and a double J catheter is inserted. Ureteral stricture, if later encountered, is treated with balloon dilatation. RESULTS Continuity of the ureter was restored in all 4 patients. The double J stents were removed 6 weeks later and a retrograde pyelography revealed resolution of the hydronephrosis without extravasation of urine. CONCLUSION Although a very satisfactory result was achieved in our cases, more cases are needed to show if it can be an alternative to conventional surgical repair. However, we believe that this minimally invasive technique can be used for short obliterated ureteral segments and neither delays nor does it preclude further management using open surgery.