* <spoiler text="How does this lesion differ from the lesions seen in sarcoid?">These are caseating granulomas with a central region of caseation necrosis and macrophages and lymphocytes around the periphery. Multinucleated, primarily Langhans’ type, giant cells are present within these nodules.</spoiler>

* <spoiler text="What are epithelioid cells?">Epitheliod cells are tissue macrophages that have an epithelium-like appearance.</spoiler>

{{IPLab 3}}

[[Category: IPLab:Lab 3]]