Twins with congenital deficiency of abdominal musculature.
D000009:Abdominal Muscles / Q000002:abnormalities*; D000015:Abnormalities, Multiple / Q000235:genetics*; D004200:Diseases in Twins; D006554:Hernia, Umbilical / Q000150:complications / Q000235:genetics*; D006801:Humans; D007231:Infant, Newborn; D008297:Male; D013737:Testis / Q000002:abnormalities*; D014564:Urogenital Abnormalities