[Partial trisomy 9 with partial retention of the long arm (author's transl)].

A new case of partial trisomy 9 is reported. The characteristic clinical features consist of: 1. Microcephaly, enophthalmos, antimongloid slant of the eyes, hypertelorism, protruding ears, large nose, downward slant of the mouth corners, hypoplasia of phalanges. 2. Abnormal dermal ridge system and crease picture: irregularities of the ridge pattern of finger prints, palms and soles, a much reduced total ridge count (TRC), transverse palmar crease on both palms, underdevelopment of the C line. 3 Severe mental retardation. However, this case represents a variation of the chromosomal anomaly described so far, in as much as an important part of the long arm of the additional chromosome 9 is present.