[Thoracopagus. Possibilities of surgical separation].

A new case of thoracopagus twins is reported. Radiological, hemodynamical and surgical explorations showed a communication between the two hearts, situated at the atrial level and associated with digestive and cardiovascular malformations. These abnormalities were definned by the anatomical study realized after vascular injection:hypoplastic pulmonary artery (associated with a persistent atrio-ventricular canal in one case, with a tricuspid atresia in the other case), a large fused liver, common pancreas and ileum. A bibliographic study allows the authors to define surgical separation possibilities. The prognosis depends essentially on cardiovascular abnormalities associating abnormal connections between the twins' hearts with malformations often too severe for surgical repair.