The first patient with trisomy 9, an infant who survived 28 days, is reported. Clinical findings included microcephaly, low-set malformed ears, small palpebral fissures, enophthalmos, bulbous nose, micrognathia, low hairline, congenital heart disease, skeletal abnormalities, small penis, hypoplastic scrotum, and a Dandy-Walker like deformity of the fourth ventricle.
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L. Atkins (1973) studied this question.
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