Cri du chat-syndrome in combination with partial trisomy 9 p.

A partial monosomy 5p leading to the Cri du chat-Syndrome combined with a partial trisomy 9p was observed in a mentally defective boy with typical clinical features for both syndromes. This chromosomal aberration is inherited from a t [5; 9] (p. 13.3; 13.1) translocation carrier father. Further family investigations showed many balanced translocation carriers through several generations.