title: X-linked cubitus valgus with mental retardation and typical face.
abstract: In 1973, Jones and Smith described two maternal male first cousins with a similar pattern of malformation, including mental retardation, cubitus valgus, and unusual facies. The purpose of this report is to describe three additional cases, a 10-year-old male and his 30-year-old maternal uncle and an unrelated 15-year-old boy, bringing to five the total number of individuals with this disorder. The principal features include moderate mental retardation, mild microcephaly, a short philtrum, deep-set, downslanting palpebral fissures, multiple nevi, and striking cubitus valgus. Documentation of this disorder in two maternal male first cousins as well as in a male and his maternal uncle support an X-linked recessive mode of inheritance for this condition.
authors.affiliation: Department of Pediatrics, University of California, San Diego, School of Medicine, La Jolla, California, USA. klyons@ucsd.edu
authors.forename: Kenneth Lyons
authors.initials: KL
authors.lastname: Jones
authors.forename: Kenjiro
authors.initials: K
authors.lastname: Kosaki
authors.forename: Bryan D
authors.initials: BD
authors.lastname: Hall
mesh_terms: D000015:Abnormalities, Multiple / Q000235:genetics*; D000293:Adolescent; D000328:Adult; D002648:Child; D004551:Elbow Joint / Q000002:abnormalities*; D019066:Facies; D040181:Genetic Diseases, X-Linked / Q000235:genetics*; D006801:Humans; D008607:Intellectual Disability / Q000235:genetics*; D008297:Male; D010375:Pedigree