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Cebocephaly (from Greek kebos, monkey + kephale, head) is a developmental anomaly of the head characterized by a monkey-like head, with a defective small, flattened nose with a single nostril or absent nose and closely set eyes. Cebocephaly is part of a group of defects called holoprosencephaly. The incidence of cebocephaly is 1 in 16,000 births.