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A rare chromosomal aberration characterized by presence of two additional copies of a fragment of the long arms in an otherwise diploid chromosome 15 occurring in association with multiple abnormalities, including metopic craniosynostosis, facial anomalies, cranial asymmetry, atrio-septal defects, hydronephrosis, flexion contractures of the lower limbs, mental retardation, sensorineural hearing loss, and mental retardation.
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