Colorectal cancer under the age of twenty years.
D002288:Adenocarcinoma, Mucinous / Q000473:pathology*; D000293:Adolescent; D002648:Child; D003110:Colonic Neoplasms / Q000473:pathology*; D006801:Humans; D008297:Male; D012004:Rectal Neoplasms / Q000473:pathology*