| Unna-Pappenheim stain | <technique> A contrast stain consisting of a methyl green-pyronin solution; originally used for gonococci, but later used to detect RNA and DNA in tissue sections; RNA is stained red and DNA appears green; used to demonstrate plasma cells during chronic inflammation. See: methyl green-pyronin stain. (05 Mar 2000) |
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| Unna, Paul | <person> German dermatologist and staining expert, 1850-1929. See: Unna's disease, Unna's mark, Unna's stain, Unna-Pappenheim stain, Unna-Taenzer stain. (05 Mar 2000) |
| Unna's disease | <dermatology> A form of inflammatory skin rash that results from an over activity of the sebaceous glands in the skin. Treatment often includes a mild hydrocortisone-containing cream. (27 Sep 1997) |
| Unna's mark | A pale vascular birthmark found on the nape of the neck in 25 to 50% of normal persons. Synonym: Unna's mark. (05 Mar 2000) |
| Unna's stain | <technique> An alkaline methylene blue stain for plasma cells, a polychrome methylene blue stain with which mast cells are stained red (metachromatic). (05 Mar 2000) |
| Unna-Taenzer stain | <technique> An orcein solution used for staining elastic tissue. Synonym: Unna-Taenzer stain. (05 Mar 2000) |
| acquired nevus | A melanocytic nevus that is not visible at birth, but appears in childhood or adult life. (05 Mar 2000) |
| balloon cell nevus | A nevus in which many of the cells are large, with clear cytoplasm. (05 Mar 2000) |
| basal cell nevus | A hereditary disease noted in infancy or adolescence, characterised by lesions of the eyelids, nose, cheeks, neck, and axillae, appearing as uneroded flesh-coloured papules, some becoming pedunculated, and histologically indistinguishable from basal cell epithelioma; also noted are punctate keratotic lesions of the palms and soles; the lesions usually remain benign, but in some cases ulceration and invasion occur and are evidence of malignant change; autosomal dominant inheritance. (05 Mar 2000) |
| basal cell nevus syndrome | <syndrome> An inherited group of defects which involve abnormalities of the skin, eyes, nervous system, endocrine, glands and bones. The condition is characterised by an unusual facial appearance and a predisposition for skin cancer. (27 Sep 1997) |
| bathing trunk nevus | These large pigmented (often hairy) congenital nevi are important because of their increased risk (10 to 15%) of conversion into malignant melanoma. A biopsy can confirm if cells have turned malignant. Any change in a pre-existing nevus should prompt a physician evaluation. (27 Sep 1997) |
| Becker's nevus | A nevus first seen as an irregular pigmentation of the shoulders, upper chest, or scapular area, gradually enlarging irregularly and becoming thickened and hairy. Synonym: pigmented hair epidermal nevus. (05 Mar 2000) |
| blue nevus | A dark blue or blue-black nevus covered by smooth skin and formed by heavily pigmented spindle-shaped or dendritic melanocytes in the reticular dermis. Synonym: Jadassohn-Tieche nevus. (05 Mar 2000) |
| blue rubber bleb nevus syndrome | <radiology> Bean syndrome, sporadic (some autosomal dominant), rubbery, raised blue-black skin nevi (cavernous haemangiomata, 0.1 - 5 cm), GI mucosal haemangiomata, bowel: polypoid filling defects of varying sizes, visceral haemangiomata (by angio) associated with: leukaemia, medulloblastoma, hypernephroma, Mafucci syndrome More info: blue rubber bleb nevus syndrome (12 Dec 1998) |
| capillary nevus | Capillary haemangioma of the skin. (05 Mar 2000) |