Ring chromosome 15 is a rare chromosomal anomaly syndrome, with a highly variable phenotype, characterized by pre- and/or postnatal growth retardation, variable intellectual disability, short stature, dysmorphic features (microcephaly, triangular facies, frontal bossing, hypertelorism, ear anomaly, broad nasal bridge, highly arched palate, micrognathism), hand and feet anomalies (e.g. brachydactyly, clinodactyly, syndactyly), and multiple hyperpigmented and/or hypopigmented spots. Severe phenotypes present with cardiac abnormalities and/or renal malformations. Other reported features include hypotonia, speech delay, talipes equinovarus, and genital anomalies (cryptorchidism and hypospadias).
Fryns JP, Timmermans J, Hondt FD, Francois B, Emmery L, van den Berghe H. Hum Genet. 1979;51(1):43-8.
A review of the nine cases described in the literature shows that ring chromosomes 15 are associated with a rather uniform phenotype characterized by slight to moderate mental retardation, marked pre- and postnatal growth failure, triangular face, and short hands and feet.
