These are epithelioid cells around the center of a granuloma. They get their name from the fact that they have lots of pink cytoplasm similar to squamous epithelial cells. Their nuclei tend to be long and stringy.

Question: What bone marrow-derived cell can become an epithelioid cell?

AnswerMonocytes can circulate and be attracted by cytokines such as interferon-gamma to sites of persistent inflammation. Upon leaving circulation they become tissue macrophages that can transform to epithelioid cells.