Two sibs with partial trisomy-5p are reported. Their father is the carrier of a balanced translocation 46,XY,t(4q+;5p-). Twelve cases of partial trisomy-5p--including our two patients--have been reported. The most common abnormalities found were mental retardation, short stature, dolichocephaly, prominent nasal bridge, prognathism, seizures, hypotonia, ear abnormalities, increased ulnar loops on the fingertips, and cryptorchidism in affected males.

Minor abnormalities are described in an 11-month-old female in which a "de novo" trisomy 1q32 leads to lqter and a monosomy 3p25 leads to ter has been produced. The amount of the exceeding material in this case is less than that found in previous reports of partial trisomy 1q and in cases of parental 1q balanced translocations which has originated recurrent abortions.