US and CT diagnosis of a twisted lipomatous appendage of the falciform ligament

Pathologic conditions of the falciform ligament leading to surgical interve ntion are extremely uncommon. We report a case of twisted lipomatous append age of this ligament, demonstrated by US and CT. To our knowledge, there ha ve been no previous reports of this entity. The extraperitoneal nature of t he lesion was found by realtime sonography, but CT only was able to charact erize its lipomatous nature and relationship with the falciform ligament. T his lesion should be considered in the differential diagnosis of intra-abdo minal focal fat infarction (IFFI), a recent vocable essentially regrouping infarction of omentum and epiploic appendages.