Muhammed Tosun

Dr. Muhammed Tosun


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Representative Publications

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1 January 2017 in Urology Research and Practice
Verified
Journal Article
Closed access
İBİsmail Başıbüyük
İsmail Başıbüyük
MTMuhammed Tosun
Muhammed Tosun
SKSenad Kalkan
Senad Kalkan
ATAbdulkadir Tepeler
Abdulkadir Tepeler
Foreign bodies are rare and challenging issues leading to symptoms according to the location. Laparoscopy is a popular and minimally invasive method used for removal of foreign bodies in the abdominal cavity or retroperitoneum. We herein report a case with retroperitoneal foreign body that was removed through retroperitoneal single- port laparoscopy using nephroscope. To our knowledge this is the first case of removal of a retroperitoneal foreign body through single- port laparoscopy using nephroscope. Cite this article as: Başıbüyük İ, Tosun M, Kalkan S, Tepeler A. Removal of a retroperitoneal foreign body through single port laparoscopy using nephroscope. Turk J Urol 2017; 43: 386-9

21 July 2026 in Aile Hekimliği Ve Palyatif Bakım
Verified
Journal Article
Closed access
RÖRecep Özkan
Recep Özkan
MTMehmet Tatlı
Mehmet Tatlı
OTOsman Türkmen
Osman Türkmen
GAGamze Aydın
Gamze Aydın
MTMuhammed Tosun
Muhammed Tosun
Introduction: The aim of this study was to analyze the demographic, clinical, and specialty-based distribution of patient referrals from a tertiary hospital to other provinces during 2024, with particular emphasis on referrals related to hyperbaric medicine.Methods: This retrospective descriptive study included all patient referrals made from our hospital 2024. Data were obtained from the hospital information management system and evaluated according to age, sex, specialty of referral, type of institution (public/private), and reason for referral. This retrospective descriptive study was conducted using all 2024 patient referral records from Van Training and Research Hospital.Results: Most referrals (67.3%, n=1,511) were made to public hospitals. Pediatric cardiology (10.6%) and nephrology (5.7%) were the leading specialties for referrals, with pediatric patients representing the majority of the sample (0–19 years: 42.1%). In addition, a small number of patients requiring hyperbaric oxygen therapy (HBOT) were referred to other provinces (0.3%), and all HBOT-related referrals occurred because the hospital’s hyperbaric chamber was undergoing maintenance and revision during the study period.Conclusion: The findings of this study indicate that inter-provincial referrals were predominantly driven by shortages in pediatric subspecialty services and temporary interruptions in hyperbaric oxygen therapy (HBOT) availability. The increase in HBOT related referrals during the chamber maintenance period highlights the importance of ensuring uninterrupted access to hyperbaric services through effective maintenance planning and coordination with alternative centers. Furthermore, enhancing physicians awareness of HBOT indications and referral criteria may reduce unnecessary transfers and improve the efficiency of referral pathways.

1 October 2026 in Journal of Clinical Medicine
Verified
Journal Article
Open access
PDF file
MKmehmet Koçoğlu
mehmet Koçoğlu
OKOya Soylu Karapınar
Oya Soylu Karapınar
MTMuhammed Tosun
Muhammed Tosun
BPBerna Haliloğlu Peker
Berna Haliloğlu Peker
Background/Objectives: Stress urinary incontinence (SUI) is a common condition that adversely affects women’s quality of life, and transobturator tape (TOT) surgery is one of the most commonly used treatments; however, the determinants of surgical success and postoperative complications remain incompletely understood. The aim of this study was to evaluate the association between postoperative transperineal ultrasound (TPUS) findings and surgical outcomes after TOT surgery for SUI, with particular emphasis on the relationship between sling arm morphology and postoperative dyspareunia. Methods: In this single-centre, cross-sectional follow-up study of a retrospectively identified cohort, 74 of 148 women who underwent TOT surgery between February 2019 and November 2024 were evaluated. TPUS was used to assess sling position, morphology, mobility, deformability, symphysis pubis–sling distance (SP-TAPE), urethral concordance, and bladder wall thickness. Patient-reported outcomes were evaluated using the I-QOL, UDI-6, IIQ-7, and OAB-V8 questionnaires. Factors independently associated with surgical success were identified using multivariable logistic regression analysis. Results: Objective surgical success was achieved in 71.6% of patients, whereas 91.9% reported satisfaction with the outcome. Concordant movement of the sling with the urethra (OR 8.963, 95% CI 1.612–49.857, p = 0.012), a shorter SP-TAPE distance during Valsalva (OR 0.337, 95% CI 0.181–0.629, p = 0.001) and a thinner bladder wall (OR 0.375, 95% CI 0.185–0.759, p = 0.006) were independently associated with objective success. Although sling arm morphology was not associated with surgical success (p = 0.797), among sexually active women (n = 61), curved sling arms were strongly associated with postoperative dyspareunia (75.0% vs. 27.3%; OR 8.00, 95% CI 2.54–25.22, p < 0.001). Bladder wall thickness correlated moderately with all four instruments (|r| = 0.551–0.667; all p < 0.001), inversely with I-QOL and positively with UDI-6, IIQ-7, and OAB-V8. Conclusions: Successful TOT surgery depends not only on appropriate sling localization but also on concordant sling–urethral movement and favourable dynamic sling behaviour. Although sling arm morphology was not associated with continence outcomes, its association with postoperative dyspareunia highlights the importance of evaluating both functional cure and postoperative quality of life. In the absence of preoperative data, this association should be regarded as exploratory. TPUS provides clinically valuable information for the postoperative assessment of outside-in transobturator slings; because all assessments were performed at a single visit, the relationships reported here are associations rather than demonstrated predictive relationships.


19 March 2026
Verified
Book Chapter
Open access
MTMuhammed Tosun
Muhammed Tosun
Erkek hipogonadizmi, testosteron eksikliği ve buna eşlik eden semptom ve bulgularla karakterize önemli bir klinik sendromdur. Prevalansı yaşla birlikte artmakta olup, obezite, tip 2 diyabet ve metabolik sendrom gibi komorbiditelerle yakından ilişkilidir. Bu durum, cinsel fonksiyon bozuklukları, kas kütlesinde azalma, kemik yoğunluğunda düşüş, bilişsel fonksiyonlarda bozulma ve genel yaşam kalitesinde azalma gibi çok sayıda sistemi etkileyen sonuçlara yol açabilir. Ürolojik pratikte sıkça karşılaşılan bu sendromun yönetimi, sadece testosteron seviyelerinin düzeltilmesini değil, aynı zamanda altta yatan nedenlerin araştırılmasını, hasta beklentilerinin yönetilmesini ve potansiyel risklerin dikkatle değerlendirilmesini gerektirir. Tanı süreci, spesifik semptomların varlığında, sabah saatlerinde ve en az iki ayrı ölçümde total testosteron seviyesinin düşük olduğunun doğrulanmasına dayanır. Tedavide temel yaklaşım testosteron replasman tedavisi (TRT) olmakla birlikte, tedavi kararı hastanın yaşına, komorbiditelerine, fertilite beklentisine ve potansiyel kontrendikasyonlara göre bireyselleştirilmelidir. Özellikle fertilite planlayan erkeklerde veya prostat ve meme kanseri gibi durumlarda TRT'nin riskleri ve alternatif tedavi seçenekleri dikkatle ele alınmalıdır. Erkek hipogonadizminin etkin yönetimi, ürologların merkezde yer aldığı, endokrinoloji, kardiyoloji, androloji ve birinci basamak hekimlerinin dahil olduğu multidisipliner bir yaklaşım gerektirir. Bu bölüm, erkek hipogonadizmine ürolojik perspektiften güncel tanı, tedavi ve yönetim stratejilerini uluslararası kılavuzlar ışığında özetlemektedir.

28 August 2026 in Journal of Clinical Medicine
Verified
Journal Article
Open access
PDF file
HŞHakan Şığva
Hakan Şığva
MSMehmet Sevim
Mehmet Sevim
ADArif Mehmet Duran
Arif Mehmet Duran
MTMuhammed Tosun
Muhammed Tosun
ÖBÖmer Büyüktepe
Ömer Büyüktepe
FGFatih Gokalp
Fatih Gokalp
Background/Objectives: Acute obstructive pyelonephritis (AOP) is a urological emergency requiring urgent decompression. We aimed to develop and internally validate an interpretable admission-based score (AP-Score) to predict the likelihood of undergoing percutaneous nephrostomy (PCN) and to test whether it outperforms hydronephrosis grade alone. Methods: We retrospectively analyzed 231 adults with AOP treated with antibiotics alone, double-J stenting, or PCN at a single center. Four admission variables (temperature, C-reactive protein [CRP], serum creatinine, and hydronephrosis grade) were evaluated by multivariable logistic regression and likelihood ratio testing. Discrimination was compared against hydronephrosis grade alone using the DeLong test; calibration and clinical usefulness were assessed, and optimism was estimated using 1000 bootstrap resamples. Results: In the likelihood ratio test, while adding CRP to hydronephrosis grade significantly improved model fit (p < 0.001), serum creatinine provided a smaller additional contribution (p = 0.013). The AP-Score (0–8 points) combined these three variables included in the model; in the categorical model, the grade of hydronephrosis and CRP appeared as independent predictors, whereas creatinine was included due to its contribution on a continuous scale. The score achieved an AUC of 0.830 (95% CI 0.771–0.886), performing significantly better than the model using only the grade of hydronephrosis (AUC 0.772; ΔAUC = +0.058, DeLong p = 0.010; IDI = 0.061, p = 0.002). The optimism-corrected AUC was calculated as 0.827, and calibration was found to be adequate (Hosmer–Lemeshow p = 0.342). A threshold value of ≥4 points yielded a sensitivity of 85.3% and a specificity of 65.0% (OR = 10.79, 95% CI 5.12–22.70); no patients scoring 0–1 points (n = 37) underwent nephrostomy. Conclusions: The AP-Score—which combines a structural parameter (degree of hydronephrosis) with two systemic markers (CRP and creatinine)—is a simple and well-calibrated score that performs significantly better than the degree of hydronephrosis alone. The AP-Score was also associated with additional clinical outcomes, suggesting that it captures aspects of the underlying clinical course in addition to local treatment patterns. However, because the primary endpoint reflects the drainage modality selected under a single-center institutional protocol, the score should be considered hypothesis-generating until externally validated in independent, preferably multicenter cohorts with different drainage practices.