Downey cell

Downey cell
any of several atypical lymphocytes seen in infectious mononucleosis. There are three types: type I cells are mature ones with a kidney-shaped or lobulated nucleus and vacuolated, basophilic, foamy cytoplasm; type II cells contain plasmacytoid nuclei with less vacuolated and basophilic cytoplasm; and type III cells have a finer chromatin pattern and one or two nucleoli.

Medical dictionary. 2011.

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