Partial trisomy 11q due to paternal t(11q;18p); further delineation of the clinical picture.

We describe an eleven-months-old girl with a partial trisomy 11q due to a paternal t(11;18)(q142;p1131). Clinical symptoms include severe psychomotor retardation, microcephaly, cleft palate, large, beaked nose, micrognathia, short hands and proximally placed thumbs. Moreover, a partial agenesis of the callosal body and a perineal mid-line malformation are present. The clinical picture of the index case is compared with relevant findings in patients with a partial trisomy (11q) and partial monosomy (18p) (Aksu 1977).