Urethral Valves vs. Urethral Diverticulum
Left picture: Here, congenital posterior urethral valves are present as cause of the bladder voiding disorder. The diagnosis can be concluded from the shape and location of the urethral dilatation, and from the following indications: - reflux from the posterior urethra in the left or right seminal vesicle; - hypertrophy of the bladder (irregular structure above the posterior urethra); - secondary reflux in the right ureter and kidney (dilated and tortuous structure running in a cranial direction). Right picture: In this VCUG, only the initial part of the urethra is shown. Distally of it there is a large and sac-like, broad-based diverticulum which does not allow to recognize the compressed anterior urethra, and which is the cause of the megalopenis and the drop by drop micturation. Look at the picture at the bottom which shows the megalopenis.
Left picture: VCUG in a newborn with bladder voiding disorders. The micturation of contrast with a catheter still in place displays a different calibre of the urethra, and, in addition, shows in the beginning part a grotesque and longitudinal-oval dilatation. Above the urethra a dilated and tortuous structure is visible, which runs in a cranial direction. Right picture: VCUG in a newborn with a large penis (= megalopenis), and only dripping micturation.