Noonan's syndrome in association with acute leukemia.

Noonan's syndrome (NS) is a syndrome with multiple congenital anomalies, characterized by craniofacial anomalies, congenital heart disease, skeletal and genital abnormalities, and mild mental retardation. Chromosomal abnormalities have been found in only a few cases. The combination of NS and acute leukemia has been reported in only three cases. Two additional cases are described here.