The 48 XXYY syndrome is a distinct clinical and genetic entity with an incidence of 1/40000 to 1/18000. A 15-month-old child was admitted in genetic clinics for psycho-motor delayed management. The patient disclosed a dysmorphism with hypertelorism, up slanting palpebral fissure, broad, high and bulging forehead, hypertelorism, very marked furrow of the filtrum and the mouth in the shape of a cocked hat, a microstomy and a development delay. The Karyotype study showed a 48, XXYY chromosome which was present in all analyzed cells. Here, we report a case of a patient with 48, XXYY syndrome diagnosed at the age of 15 months old in order to show the particularities of this syndrome in a beninese child.
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