《英文msh词典》Disease,Hirschsprung's
[入口词] Disease,Hirschsprung's
[主题词] Hirschsprung Disease
[英文释义] Congenital MEGACOLON resulting from the absence of ganglion cells (aganglionosis) in a distal segment of the LARGE INTESTINE. The aganglionic segment is permanently contracted thus causing dilatation proximal to it. In most cases,the aganglionic segment is within the RECTUM and SIGMOID COLON.