<prompt> On contrast radiography which among the following is falseIleum is featurelessColon has haustrationsJejunum is featheryDistal pa of duodenum has a cap  <response>: First pa of the duodenum is visible as a triangular shadow on barium studies and is known as duodenal cap Small intestine contains mucosal folds known as plicae circulares that are visible on barium studies and help in the distinction between small intestine and colon. Colon instead can be identified by presence of haustrations. valvulae conniventes are more prominent in the jejunum giving the Feathery appearence on barium and reduced distally giving a featureless appearance of distal ileum. Ref: Grays Anatomy 41st edition Pgno: 1124 