title: Lymphstasis in a boy with Noonan syndrome: implication for the development of skeletal features.
abstract: We report on a Japanese boy with Noonan syndrome who had short stature, bilateral cryptorchidism, poor pubertal development, mild mental retardation, complex cardiac lesions consisting of hypertrophic cardiomyopathy, mitral valve stenosis and insufficiency, subvalvular aortic stenosis, and single coronary artery, and various dysmorphic features including hypertelorism, epicanthic folds, low set malrotated ears, high arched palate, micrognathia, webbed neck, low posterior hairline, shield chest, pectus excavatum, cubitus valgus, borderline short metatarsals, lymphedema, redundant skin, and nail dysplasia. Because of marked lymphedema in the bilateral lower legs, lymphatic scintigraphy was carried out at 13.3 years of age, indicating extreme lymphstasis in the lower extremities, severe lymphstasis in the forearm, the elbow, and the axillary regions, moderate lymphstasis around the ascending aorta, and mild lymphstasis in the bilateral lungs. The results, in conjunction with those suggested in Turner syndrome, imply that lymphatic hypoplasia/dysplasia and resultant distended lymphatics and lymphedema are relevant to the development of not only soft tissue and visceral anomalies but also skeletal anomalies in Noonan syndrome.
authors.affiliation: Department of Endocrinology and Metabolism, National Research Institute for Child Health and Development, Setagaya, Tokyo 154-8567, Japan.
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Ogata
authors.forename: Seiji
authors.initials: S
authors.lastname: Sato
authors.forename: Yukihiro
authors.initials: Y
authors.lastname: Hasegawa
authors.forename: Kenjiro
authors.initials: K
authors.lastname: Kosaki
mesh_terms: D000293:Adolescent; D001842:Bone and Bones / Q000002:abnormalities* / Q000000981:diagnostic imaging; D006801:Humans; D008209:Lymphedema / Q000000981:diagnostic imaging / Q000209:etiology*; D008297:Male; D009634:Noonan Syndrome / Q000150:complications* / Q000175:diagnosis / Q000235:genetics; D011877:Radionuclide Imaging