| cellular blue n. |
a large blue or blue-black, multilobulated, well-circumscribed nodular tumor, usually congenital, generally found around the buttocks or sacrococcygeal region. It consists of deeply pigmented, dendritic, spindle-shaped melanocytes alternating with cellular islands of spindle cells with ovoid nuclei and abundant pale cytoplasm; these are found in the dermis and subcutaneous tissue. These nevi have a low incidence of malignant transformation to melanoma, in which case they show cellular pleomorphism, mitotic figures, and evidence of invasion into the deep dermis. Called also dermal melanocytoma. Cf. blue n.
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| cellular c. |
a variety composed almost entirely of cells, with little interstitial substance; called also parenchymatous c.
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| cellular f. |
see fission (def. 2).
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| cellular i. |
deficiency in cellular immunity (q.v.), marked by recurrent infections with low-grade or opportunistic pathogens, by graft-versus-host reactions following blood transfusions, and by severe disease following immunization with live vaccines. For a list of disorders of this type, see table.
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| cellular immunity t. |
Metchnikoff's cellular immunity t.
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