BARIUM FINDINGS IN RETROGRADE INTUSSUSCEPTION

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Abstract
Four instances of antiperistaltic intussusception are presented. These serve to depict the varied roentgen appearances in both types of intussusception on barium study and emphasize two simple interpretational principles: (1) when contrast material is administered orad to an antegrade or caudad to a retrograde intussusception, it must first enter the intussusceptum; and (2) when barium is administered orad to a retrograde or caudad to an antegrade intussusception, it must first enter the intussuscipiens. Attention is also directed to tube related intussusceptions and to potential difficulty in their identification.

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