epithelioid cell


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Related to epithelioid cell: giant cell

epithelioid cell

[‚ep·ə′thē·lē‚ȯid ‚sel]
(histology)
A macrophage that resembles an epithelial cell. Also known as alveolated cell.
References in periodicals archive ?
Desmoplastic nevus: A distinct histologic variant of mixed spindle cell and epithelioid cell nevus.
Perivascular epithelioid cell tumor of the sigmoid colon with transcription factor E3 expression [published online ahead of print May 3, 2011].
Histologically, it is characterized by solid sheets or nests of epithelioid cells with cellular pleomorphism, increased mitotic activity, eosinophilic cytoplasm, vesicular nuclei, and prominent nucleoli.
Microscopically, this nodule was composed of moderately sized epithelioid cells with indistinct cell borders, fibrillary cytoplasm, and round to irregular nuclei with clumped chromatin within a fibromyxoid background (figure).
On histologic examination, necrotic foci, surrounded by macrophages, giant cells, and epithelioid cells, were visible in the lungs.
Histologic examination demonstrated epithelioid cells arranged in papillae, cords and solid nests.
Other lymphokines cause the activation and differentiation of recruited monocytes into activated macrophages, giant cells, and epithelioid cells, the characteristic cells of sarcoid granulomata (2).
The epithelioid cells are slightly elongated, with associated large mucus-containing physaliphorous cells (figure 2).
Epithelioid cells with well-formed vascular lumens, consistent with an epithelioid hemangioma.
Histologically, the tumor had a solid and multinodular growth pattern and was predominantly made up of spindle cells with a minor component of epithelioid cells with moderate cellular atypia.
Ziehl-Neelsen staining showed an intracellular accumulation of acid-fast bacteria in several alveolar macrophages and epithelioid cells.
For years, these lesions were regarded as smooth muscle tumors and designated as leiomyomas and leiomyosarcomas when composed of spindle cells and as benign or malignant leiomyoblastomas when composed of epithelioid cells.