Anomalous peritoneal folds of the duodenum--a normal variant simulating disease.

The double contrast barium meal appearance of four cases is presented where an anomalous peritoneal fold involves the duodenum. This fold results in a characteristic smooth, extrinsic indentation upon the antero-superior surface of the duodenal cap. This normal variant should be differentiated from distortion of this region due to pathology such as peptic ulceration. Anomalous peritoneal folds which involve the duodenum (cystoduodenal ligament, cysto-gastrocolic ligament) are not believed to cause symptoms (1). However, the recognition of the deformity produced by these folds is important, requiring differentiation from pathological changes.