Agenesis: may be a part of complex defects of the urogenital system
Extrophy of the urinary bladder: The bladder is exposed through a defect in the lower abdominal wall. The mucosa of the urinary bladder verges into the skin. The pelvis is not connected by symphysis. Ureters drain into the bladder normally and drench its surface. The urethra opens onto the dorsal side of the penis — epispadia. The defect is very rare and occurs in 1 : 40000.