[abnormally large or dilated colon due to congenital absence of myenteric ganglion cells in a distal segment of the large bowel; resultant loss of motor function in this segment causes massive hypertrophic dilatation of the normal proximal colon; condition appears soon after birth; called also Hirschsprung's disease, aganglionic megacolon and pelvirectal achalasia. ( CSP )]
UMLS (CSP) C0019569 Relation/PAR: colon disorder
Megacolon
ANOM DIGESTIVE SYST NOS
congenital gastrointestinal disorder