cutaneous mastocytosis
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cutaneous mastocytoma
VARIANTS: solitary mastocytoma, urticaria pigmentosa, systemic mastocytosis, TMEP (telangiectasia macularis eruptiva perstans)
DERMATOPATHOLOGY: First 3 variants have perivascular or diffuse mast cells within the upper dermis with occasional subepidermal bulla formation. TMEP has telangiectatic vessels with increased perivascular mast cells (>10 mast cells per 40x field). Mast cells are highlighted with Giemsa or toluidine blue special stains. Immunohistochemistry with CD117 antibodies may also be used.
DIFFERENTIAL: collections of mast cells may resemble nevus cells, histiocytes, Langerhans cells, and leukemic infiltrates