[136 karyotypes in psychiatry: surprising results]

136 patients admitted into a psychiatric unit underwent a routine caryotype examination, without any previous selection, 9 anomalies were noticed, including one case of X-tetrasomia, reported elsewhere, and eight mosaics. The patients concerned do not present any morphological anomaly or intellectual deficiency. The authors consider those--mostly gonosomial--mosaics as a minimal brain damage, favourising the appearance of the particular psychiatric syndrome.