Question

in males the most common cause of both bilateral hydroureters & hydronephrosis is:
acute pyelonephritis
benign prostatic hyperplasia
stones in the renal pelvis
cystitis of the urinary bladder
hypospadias
question 25 (1.43 points)

Explanation:

To determine the most common cause of bilateral hydroureters and hydronephrosis in males, we analyze each option:

• Acute pyelonephritis: An infection of the kidneys, usually unilateral, not a common cause of bilateral ureteral and renal pelvis dilation.
• Benign prostatic hyperplasia (BPH): In BPH, the enlarged prostate obstructs the urethra, leading to urinary retention. This backpressure can cause bilateral hydroureters (dilation of ureters) and hydronephrosis (dilation of renal pelvis and calyces) as urine backs up from the bladder into the ureters and kidneys. This is a common cause in older males.
• Stones in the renal pelvis: Renal calculi (stones) often cause unilateral obstruction unless there are stones in both kidneys, which is less common than BPH - related obstruction.
• Cystitis of the urinary bladder: A bladder infection, typically does not cause bilateral hydroureters/hydronephrosis as it is localized to the bladder.
• Hypospadias: A congenital defect of the urethral opening, not related to obstruction causing bilateral hydroureters/hydronephrosis.

So, Benign prostatic hyperplasia is the most common cause.

Answer:

B. Benign prostatic hyperplasia