stain (stān)
port-wine stain.
stain [stān]
1. a substance used to impart color to tissues or cells, to facilitate microscopic study and identification.
2. an area of discoloration of the skin.
differential stain one which facilitates differentiation of various elements in a specimen.
Giemsa stain a solution containing azure II-eosin, azure II, glycerin, and methanol; used for staining protozoan parasites, such as Plasmodium and Trypanosoma, for Chlamydia, for differential staining of blood smears, and for viral inclusion bodies.
Gram stain a staining procedure in which microorganisms are stained with crystal violet, treated with strong iodine solution, decolorized with ethanol or ethanol-acetone, and counterstained with a contrasting dye; those retaining the stain are gram-positive, and those losing the stain but staining with the counterstain are gram-negative.
hematoxylin-eosin stain a mixture of hematoxylin in distilled water and aqueous eosin solution, employed universally for routine tissue examination.
metachromatic stain one which produces in certain elements colors different from that of the stain itself.
port-wine stain see nevus flammeus.
supravital stain a stain introduced in living tissue that has been removed from the body, but before cessation of the chemical life of the cells.
tumor stain an area of increased density in a radiograph, due to collection of contrast material in distorted and abnormal vessels, prominent in the capillary and venous phase of arteriography, and presumed to indicate neoplasm.
vital stain a stain introduced into the living organism, and taken up selectively by various tissues or cellular elements.
Wright's stain a mixture of eosin and methylene blue, used for demonstrating blood cells and malarial parasites.
port-wine stain (pôrt w n)n. A purplish area of the skin, usually on the head and neck, appearing at birth and caused by an overgrowth of the cutaneous capillaries. Also called nevus flammeus, port-wine mark. |
port-wine stain.
See nevus flammeus.
Port Wine Nevus
A common congenital neurovascular malformation, appearing as deep red-purple macular lesions, corresponding to cutaneous angioma(s), often located in the ophthalmic branch of the trigeminal nerve; when located on the meninges, port-wine nevi may be confined to the occipitoparietal pial vessels, where sluggish blood flow predisposes to hypoxia of underlying cortex; port-wine nevi may occur in the normal population—e.g., Mikhail Gorbachev—or be part of various syndromes—e.g., Klippel-Trenaunay, Beckwith-Wiedemann, Cobb, Rubenstein-Taybi, trisomy 13 syndromes
Management Flashlamp-pulsed tunable argon dye laser, most effective if administered < age 7. More treatment may be required for facial lesions
Management Flashlamp-pulsed tunable argon dye laser, most effective if administered < age 7. More treatment may be required for facial lesions
stain [stān]
1. a substance used to impart color to tissues or cells, to facilitate microscopic study and identification.
2. an area of discoloration of the skin.
acid-fast stain a staining procedure for demonstrating acid-fast microorganisms.
differential stain one that facilitates differentiation of various elements in a specimen.
endogenous stain an intrinsic stain acquired during tooth development.
exogenous stain an intrinsic stain acquired after a tooth has erupted.
extrinsic stain a stain that can be removed from a tooth surface by polishing.
Giemsa stain a solution containing azure II-eosin, azure II-glycerin, and methanol; used for staining protozoan parasites such as Plasmodium and Trypanosoma, for Chlamydia, for differential staining of blood smears, and for viral inclusion bodies. Stained elements appear pink to purple to blue.
Gram stain a staining procedure in which bacteria are stained with crystal violet, treated with strong iodine solution, decolorized with ethanol or ethanol-acetone, and counterstained with a contrasting dye; those retaining the stain are called gram-positive, and those losing the stain but staining with the counterstain are called gram-negative.
hematoxylin and eosin stain a mixture of hematoxylin in distilled water and aqueous eosin solution, employed universally for routine examination of tissues.
intrinsic stain a stain that is within the enamel of a tooth and cannot be removed by polishing.
metachromatic stain one that produces in certain elements a color different from that of the stain itself.
nuclear stain one that selectively stains cell nuclei, generally a basic stain.
port-wine stain a persistent dark red to purple nevus flammeus that grows proportionately with the affected child and is usually found on the face. Initially it is macular, but the surface may develop angiomatous overgrowths with time. Port-wine stains often occur in association with other congenital abnormalities.
supravital stain a stain introduced in living tissue or cells that have been removed from the body.
tumor stain an area of increased density in a radiograph, due to collection of contrast material in distorted and abnormal vessels, prominent in the capillary and venous phases of arteriography, and presumed to indicate neoplasm.
vital stain a stain introduced into the living organism, and taken up selectively by various tissue or cellular elements.
Wright's stain a mixture of eosin and methylene blue, used for demonstrating blood cells and malarial parasites.
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