Hepatoblastoma in infant sister and brother.

Two infants, a sister with motor retardation and brother with slight microcephaly and an undescended testis, died of hepatoblastoma. Only another documented familial occurrence of this tumor, affecting siblings of the same sex, can be found in the literature. The two patients described in this paper exhibited high platelet counts prior to liver resection. Although iron deficiency may have contributed to the thrombocytosis, the finding of many megakariocytes within the hepatoblastomas suggests an intra-tumoral production of platelets. An epidemiological investigation of the family under study failed to yield conclusive data. Hepatoblastoma is a rare tumor, but it may affect more than one sibling. Therefore, periodic clinical and laboratory evaluations of the siblings at risk appear to be justified.