<prompt> Fleischner sign on barium study is seen in?Ileocecal TBCrohns diseaseSmall bowel carcinoidTyphoid  <response>: Answer- A. Ileocecal TBEarly involvement of the ileocaecal region manifesting as spasm and edema of the ileocecal valve.Thickening of the Iips of the ileocecal valve andor wide gaping of the valve with narrowing of the terminal ileum Fleishner or inveed umbrella sign are characteristic. 