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Index of Diseases

Instructions. To find the proper medical term, scroll up and down to review the alphabetical listings. Also, you can use the "Page Up" and "Page down" key on your keyboard. Or use the search function of your browser. In both Netscape and Explorer, go to "Edit" and select "Find in Page". Type in the main term of interest. Frequently, it is best to type in only the first 4 or five letters (i.e., "prost" for prostate) because that will find more alternative terms from which to select the proper one.

X

Xanthogranuloma, Juvenile

Definition: Benign disorder of infants and children characterized by multiple nodules with lipid-laden, non-Langerhans-cell histiocytes. Annotation: non-neoplastic; a non-Langerhans cell histiocytosis ID#: D014972

Xanthomatosis

Definition: A condition of morphologic change in which there is accumulation of lipids in the large foam cells of tissues. It is the cutaneous manifestation of lipidosis in which plasma fatty acids and lipoproteins are quantitatively changed. The xanthomatous eruptions have several different distinct morphologies dependent upon the specific form taken by the disease. Annotation: non-neoplastic; a metab skin dis manifest of lipidosis; coord with organ/disease term (IM); xanthogranuloma goes here (IM) + GRANULOMA (IM) but note XANTHOGRANULOMA, JUVENILE is available ID#: D014973

Xanthomatosis, Cerebrotendinous

Definition: A lipid storage disease, inherited as an autosomal recessive trait, characterized by xanthomas of the tendons, the white matter of the brain, and the lungs, and by spasticity, ataxia, pyramidal paresis, mental retardation, dementia, early cataracts, and atherosclerosis. It is associated with elevated plasma and tissue levels of cholestanol and defective bile synthesis, with the deposition of cholestanol in the central nervous system and myelin of peripheral nerves. The lesions contain cholesterol and dehydrocholesterol. (Dorland, 28th ed) Annotation: a lipid storage dis ID#: D019294

Xeroderma Pigmentosum

Definition: A rare, pigmentary, and atrophic autosomal recessive disease affecting all races. It is manifested as an extreme photosensitivity to ultraviolet light as the result of a deficiency in the enzyme that permits excisional repair of ultraviolet-damaged DNA. Annotation: /blood supply /chem /secret /ultrastruct permitted; if non-neopl, coord IM with precoord organ/dis term (IM); if neopl, coord IM with organ/neopl term (IM) ID#: D014983

Xerophthalmia

Definition: Dryness of the eye surfaces caused by deficiency of tears or conjunctival secretions. It may be associated with vitamin A deficiency, trauma, or any condition in which the eyelids do not close completely. Annotation: dryness of the eyes; do not restrict to the xerosis of vit A defic: use for any cause; do not confuse with DRY EYE SYNDROMES ID#: D014985

Xerostomia

Definition: Decreased salivary flow. Annotation: decreased saliva flow ID#: D014987