megacolon toxic megacolon https://www.malacards.org/card/toxic_megacolon MESH:D008532 An acute form of megacolon, severe pathological dilatation of the colon. It is associated with clinical conditions such as ulcerative colitis; crohn disease; amebic dysentery; or clostridium enterocolitis. MONDO:0002105 icd11.foundation:1497870078 SCTID:28536002 DOID:1770 ICD10CM:K59.31 ICD9:564.7 MEDGEN:9940 UMLS:C0025162