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Trisomy 9 syndrome is a rare genetic disorder. Trisomy 9 has two forms; 1) mosaic, 2) non-mosaic. The patients usually present similar clinical features, independent of the presence of mosaicism, characterized by growth retardation, mental deficiency and brain, facial, cardiac, renal and skeletal abnormalities. Developmental delay and mental retardation are the most common neurological symptom in trisomy 9 mosaicism in our knowledge. Epilepsy associated with this syndrome has not found in literature. We describe a 10-year-old boy with trisomy 9 mosaicism who presented seizures, and dysmorfic features. [Cukurova Med J 2014; 39(2.000): 343-346]