<prompt> All of the following are true regarding Crohn disease except: March 2008Skip lesionsInflammation limited to mucosaRecurrence common after surgeryFistulae formation is seen  <response>: Ans. B: Inflammation limited to mucosaFeatures of Crohn disease:Bowel region: Ileum, colonDistribution: skip lesionStricture formation: YesWall appearance: thickInflammation: transmuralUlcers:deep, knife-likeLymphoid reaction: markedFibrosis: markedSerositis: markedGranuloma formation: Yes 35Fistulasinuses: YesFatvitamin malabsorption: YesRecurrence after surgery: CommonToxic megacolon: No 