Benign prostatic enlargement is a common condition in elderly men, caused by a histopathologic disease called benign prostatic hyperplasia. we report a case of a 76-year-old male with a benign prostatic hyperplasia who presented kidney injury due to bilateral hydronephrosis and no amelioration after bladder catheterization. An abdominopelvic computed tomography scan was performed showing bilateral moderate ureterohydronephrosis up to the level of the ureteral orifices within a diffuse thickening of the bladder wall and the endoscopic examination showed trigonal prominence, displacing and deforming the ureteral orifice. Three-months period of ureteral stenting with transurethral resection of prostate leads to significant improvement in renal function. This case underscores the importance of considering detrusor wall thickness as a potential cause of obstructive renal insufficiency, especially in elderly males presenting with chronic retention.