Letter: Sacral agenesis.
D000013:Congenital Abnormalities / Q000175:diagnosis / Q000453:epidemiology / Q000209:etiology; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D008161:Lumbosacral Region / Q000000981:diagnostic imaging; D011247:Pregnancy; D011254:Pregnancy in Diabetics / Q000150:complications*; D011859:Radiography; D012447:Sacrum / Q000002:abnormalities*; D001750:Urinary Bladder, Neurogenic / Q000209:etiology*; D014570:Urologic Diseases / Q000517:prevention & control