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Introduction Granulomatous prostatitis is a benign inflammatory condition of the prostate that may mimic prostatic adenocarcinoma on magnetic resonance imaging findings. Even in the era of multiparametric magnetic resonance imaging, the differential diagnosis of granulomatous prostatitis from malignancy remains difficult. Case presentation A 69‐year‐old man with abnormal magnetic resonance imaging and positron emission tomography/magnetic resonance imaging findings, and a prostate‐specific antigen value of 2.48 ng/mL underwent prostate needle biopsy. He had a history of urinary tract infection 3 months prior to presentation. Multiparametric magnetic resonance imaging showed low‐intensity signals on T2‐weighted images, slightly high‐intensity signals on diffusion‐weighted images, and low values on apparent diffusion coefficients. The prostate imaging‐reporting and data system version 2 score was 3. Histological examination revealed granulomatous prostatitis. Conclusion For patients with preceding urinary tract infections, granulomatous prostatitis should be considered as a differential diagnosis, even when magnetic resonance imaging and positron emission tomography suggest prostatic adenocarcinoma.

Background: There is limited information on perioperative renal function during off-clamp, non-renorrhaphy open partial nephrectomy.Therefore, this study aimed to clarify the chronological postoperative changes in renal function after off-clamp, non-renorrhaphy open partial nephrectomy.Methods: Clinical records of 138 patients with renal tumors who underwent off-clamp, non-renorrhaphy open partial nephrectomy at our institution were reviewed. Off-clamp, non-renorrhaphy partial nephrectomy were performed using a soft coagulation system. Perioperativeestimated glomerular filtration rate (eGFR) preservation was calculated, and predictors were identified using multivariate regression analysis at 5 days, 1 month, and 3 months after surgery.Results: The median operation time was 122 minutes, and the median volume of estimated blood loss was155 mL. The mean eGFR preservation at 5 days, 1 month, and 3 months after surgery was 95.3%, 91.0%, and 90.7%, respectively. Multivariate regression analysis revealed that estimated blood loss was an independent predictor of perioperative eGFR preservation at 5 days and 1 month after surgery, while age was an independent predictor of perioperative eGFR preservation at 3months after surgery.Conclusion: Chronological changes in renal function after off-clamp, non-renorrhaphy open partial nephrectomy have been reported.Ourresults could bea reference in the era of robot-assisted partial nephrectomy.

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