Hirschsprung's disease: photograph at operation showing megacolon. Note the dilated colon with a narrow distal segment.
	Nixon A.H., A Colour Atlas of Surgery for Hirschsprungs Disease. 1985, Wolfe. Philson Library

references:

background notes on the condition: http://www.vh.org/pediatric/provider/radiology/PAP/GIDiseases/Hirsch.html

Harald Hirschsprung, biographical note: http://www.whonamedit.com/doctor.cfm/1137.html

links checked 15th May 2003: please report broken links