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.
Also applicable to/known as
Aganglionosis
Congenital dilation of colon
Congenital megacolon
Marcrocolon
ICD-9-CM Volume 2 Index Entries That Refer To 751.3