Urethral Valves vs. Urethral Polyp
Left picture: The folds running from the lower pole of the seminal colliculus to the right and left side, are posterior urethral valves. The posterior urethra is wide. Right picture: The elongated structure which is depicted twice originates like the valves in the contralateral picture from the lower pole of the seminal colliculus (picture on the right side), but grows from the midline in a distal direction; it is voluminous and moves about freely in the lumen (picture on the left side). The diagnosis is a urethral polyp.
Left picture: Urethroscopic picture of a 1.7-year-old boy with recurrent urinary tract infections and weak urinary stream, with a view of the seminal colliculus lying in the midline with sail-like folds leading to the right and left lateral side. The dorsal urethral wall is only partially visible at 11 to 12 o´clock. Right picture: Urethroscopy in a 3-year-old boy with weak urinary stream and repeated hematuria, with a view of a longitudinal structure in the midline and on the dorsal and lateral urethral wall (the anterior wall is not depicted). This structure reminds of a seminal colliculus in the picture on the left, and, on introducing the instrument further, ends with a small-based connection to the posterior urethra, which is visible in the picture on the right side.