Interstitial deletion of chromosome 7 detected in three unrelated patients.

Chromosome studies were carried out on three patients for the following reasons: (1) growth retardation and mental subnormality in a boy; (2) marked developmental delay in a female infant; (3) routine check on a man whose wife had a stillborn with congenital anomalies. An interstitial deletion at 7q11::7q21 was observed in all three cases.