TRISOMY 18 in a 50-year-old female.

She was brought to our Institute at the age of 31, with speech delay and mental handicap. She was assessed by the multidisciplinary team in the institute to determine the cause of her problems. Clinical evaluation revealed dysmorphic facial features, microbrachycephaly, camptodactyly, clinodactyly, abnormal dermatoglyphics and severe mental handicap. Cardiovascular system examination was normal. Chromosomal analysis revealed a trisomy of Chromosome 18. The phenotype of trisomy 18 and the rarity of prolonged survival in this case are discussed.