Syndromes View the Full Record Syndrome chromosome 9p tetrasomy syndrome Synonyms 9p tetrasomy tetrasomy 9p Summary Partial tetrasomy involving the short arm of chromosome 9 with psychomotor retardation and variable multiple craniofacial, skeletal, cardiovascular, and urogenital abnormalities. Microcephaly, brachycephaly, flat or sloped wide forehead, hydrocephaly, wide sutures and fontanels, and retromicrognathia. Widely spaced nipples. Pectus excavatum or carinatum. Clinodactyly, camptodactyly, brachydactyly, overlapping fingers, and talipes equinovarus.
Simian creases are the principal dermatoglyphic defects.
Onychodysplasia and hirsutism. Ventricular septal defect, auricular septal defect, patent ductus arteriosus, and persistent superior vena cava. Cryptorchidism, hypoplastic scrotum, deformed penis, infantile uterus, cleft clitoris, and kidney anomalies.