Final answer:
The most common congenital obstructive urethral lesion in males is posterior urethral valves (PUVs), which are not to be confused with BPH, a condition affecting older males.
Step-by-step explanation:
The most common congenital obstructive urethral lesion in males is posterior urethral valves (PUVs). These are abnormal folds of tissue in the urethra, which is the tube that drains urine from the bladder to the outside of the body. PUVs can cause obstruction of urine flow, leading to a variety of symptoms including poor urinary stream, failure to thrive, respiratory difficulties, and potentially, kidney damage. Although benign prostatic hyperplasia (BPH) is a common condition that causes urethral constriction due to prostate enlargement, it is not a congenital condition and typically affects older men.