phakomatoses

phakomatosis

[fak′ōmətō′sis] pl. phakomatoses

Etymology: Gk, phako, lens, oma, tumor, osis, condition

(in ophthalmology) any of several hereditary syndromes characterized by benign tumorlike nodules of the eye, skin, and brain. The four disorders designated phakomatoses are neurofibromatosis (Recklinghausen's disease), tuberous sclerosis (Bourneville's disease), encephalotrigeminal angiomatosis (Sturge-Weber syndrome), and cerebroretinal angiomatosis (von Hippel-Lindau disease). Also spelled phacomatosis.

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phakomatoses

phakos, Greek, lens Neurocutaneous syndromes A group of inherited conditions–many are AD–that cause disordered growth of ectodermal tissues, with distinctive skin lesions and tumors and/or defects of the nervous system and/or retina

Phakomatoses

Ataxia-telangiectasia An AR disorder characterized by cerebellar ataxia, oculomotor apraxia, telangiectasias of bulbar conjunctiva, skin of ears, and skin folds–appearing by age 3–and sinopulmonary infections; telangiectasias later extend to the butterfly region of the face; most Pts die in adolescence

Basal cell nevus syndrome See there

Nevus sebaceous of Jadassohn An occasionally AD clinical condition characterized by a congenital solitary lesion most often present in the scalp which, when large, may be associated with internal derangements eg intracranial masses, seizures, mental retardation, skeletal abnormalities, pigmentary changes, ocular lesions and renal hamartomas; 10% of the skin lesions develop into basal cell carcinoma

Sturge-Weber disease Encephalotrigeminal angiomatosis An occasionally AD condition characterized by congenital capillary hemangiomas of the head & neck, following normal developmental milestones, mental retardation may ensue, caused in part by the sluggish flow of blood through the pial vessels and venous hemangiomas in the leptomeninges and frontoparietal cortex with ipsilateral port-wine nevi, 'tram-track' radiopacities on the skull caused by calcification of the cerebral cortex

Tuberous sclerosis Bourneville-Pringle disease An AD disorder–50% arise de novo Clinical Convulsions, seizures, mental retardation, skin lesions–adenoma sebaceum, sebaceous gland atrophy, angiofibromas, dermal fibrosis with dilated capillaries, shagreen patches, cardiac rhabdomyomas, pulmonary fibrosis, bronchiolar hematomas, bilateral tubular adenomas of kidneys, pancreatic cysts, angiomyolipomas, myxedematous glossitis, spina bifida

von Hippel-Lindau disease An AD condition with retinal hemangioblastoma, ↓ erythropoietin production, cerebellar hemangioblastoma Clinical Ataxia, headache, papilledema, angiomas of the liver, kidney, renal adenomas, papillary cystadenomas of epididymis, pancreatic cysts, adrenal pheochromocytomas;¹⁄₄ develop renal cell cancer

von Recklinghausen disease A relatively common–1/3500 AD condition Clinical Neurofibromas, cafe-au-lait spots of skin, scoliosis, gliosis, glioblastoma multiforme, ependymoma, meningioma and schwannoma, 5-10% sarcomatous degeneration, spina bifida and glaucoma. See Neurofibromatosis

Note: Neurofibromatosis, tuberous sclerosis, and von Hippel disease constitute the 'classic' phakomatoses

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