Prenatal diagnosis of Fanconi anemia.

Prenatal diagnosis was performed on a fetus at risk for Fanconi anemia. A high spontaneous (0.30 breaks/cell) and diepoxybutane-induced (0.69 breaks/cell) chromosome breakage rate indicated an affected fetus and the pregnancy was terminated. The anatomic findings in the aborted fetus together with cytogenetic findings in cultured fetal skin fibroblasts confirmed the prenatal diagnosis.