MedGen

Prader-Willi syndrome (PWS) is characterized by severe hypotonia and feeding difficulties in early infancy, followed in later infancy or early childhood by excessive eating and gradual development of morbid obesity (unless eating is externally controlled). Motor milestones and language development are delayed. All individuals have some degree of cognitive impairment. A distinctive behavioral phenotype (with temper tantrums, stubbornness, manipulative behavior, and obsessive-compulsive characteristics) is common. Hypogonadism is present in both males and females and manifests as genital hypoplasia, incomplete pubertal development, and, in most, infertility. Short stature is common (if not treated with growth hormone); characteristic facial features, strabismus, and scoliosis are often present. [from GeneReviews]

Any Smith-McCort dysplasia in which the cause of the disease is a mutation in the DYM gene. [from MONDO]

A disorder that results from a chromosomal abnormality. [from NCI]

Chromosomal disorder in which the chromosomal anomaly involves an autosome. [from MONDO]

An abnormality of chromosome condensation. [from HPO]

This syndrome has characteristics of intellectual deficit, short stature, obesity, genital abnormalities, and hand and/or toe contractures. It has been described in two brothers and in one isolated case. This syndrome is similar to Prader-Willi syndrome, but the hand contractures and osteoporosis, together with the lack of hypotonia, indicate this is a different entity. [from SNOMEDCT_US]

A sex chromosome anomaly caused by the presence of two extra X chromosomes in females (48,XXXX instead of 46,XX). This disorder is associated with delayed speech, learning difficulties, developmental delay and facial dysmorphism. Although disease severity is variable, the learning difficulties and developmental delay are generally mild to moderate. Commonly associated facial features include hypertelorism, upslanting palpebral fissures, epicanthal folds and a flat nasal bridge. Other anomalies may include dental abnormalities, hypotonia and joint laxity, radioulnar synostosis, heart defects, hip dysplasia, and ovarian dysfunction. An increased susceptibility to infections during childhood has also been reported. [from SNOMEDCT_US]