Sympodial monsters: two autopsy cases of sympus dipus.

Two autopsy cases of sympodial monsters, sympus dipus, were studied. They are of interest not only because they show the characteristic malformations of the limbs and the viscera below the diaphragm, but because one case also shows Potter's face and an atrial septal defect of the heart. In addition, histologic determinations of sex were performed in both cases.