Truncal duplication: a case report

Truncal duplication represents one of the rare forms of conjoined twins. We observed a male infant with a truncal duplication; in the host twin no pat hology was found except an atrial septal defect and a large omphalocele. Th e parasitic twin was attached to the xiphoid region (xiphopagus) in an oppo site and "horseriding" manner, was acephalic, and had multiple gastrointest inal, genitourinary, and skeletal anomalies. The junction site consisted of lipoid and muscular structures. Surgical separation was done without any d ifficulty. The abdominal defect was repaired primarily. The host twin is do ing well.