Ivemark syndrome: asplenia with kidney collecting duct cysts and polysplenia with cerebellar cyst.

Two newborns, one male and one female, from two different families, with Ivemark syndrome proven at autopsy are reported. One of them had asplenia and another had polysplenia. Both newborns had complex cardiac defects with isomerism of the lungs. The newborn with asplenia had dextrocardia, transposition of the great vessels, stenosis of the pulmonary artery, common atrioventricular canal and patent ductus arteriosus. The newborn with polysplenia had a common atrium, hypoplastic left ventricle and patent ductus arteriosus. The patient with asplenia had cystic dilated collecting ducts of the kidney and the patient with polysplenia had cerebellar cyst. These associate malformations have not been reported previously. Both cases were sporadic.