Abstract
A 5-year-old boy with severe mental handicap, dysmorphic stigmata and a tetrasomy 21 in fibroblasts is reported. Blood lymphocytes of the patient have a normal karyotype. The origin of this tetrasomy 21 mosaicism is discussed.
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Fryns, J.P., Petit, P., Vinken, L. et al. Mosaic tetrasomy 21 in severe mental handicap. Eur J Pediatr 139, 87–89 (1982). https://doi.org/10.1007/BF00442089
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DOI: https://doi.org/10.1007/BF00442089