<prompt> What is the diagnosis of following barium studies film?Toxic megacolonChrons diseaseIntestinal perforationIntussusception  <response>: Ans. B. Chrons diseaseBarium follow-through showing terminal ileal Crohns disease. A long stricture is present arrow A, and more proximally there is ulceration with characteristic rose thorn ulcers arrow B.Radiological features of chrons diseases.a. Thickened folds.b. Aphthous ulcer.c. Cobble stoning of small intestine.d. Stricture, fistula in advanced disease.e. String sign represents long areas of circumferential inflammation and fibrosis.f. CT findings include mural thickening 2cm, perianal disease and adenopathy. 