This is a caseating granuloma. Epithelioid cells surround a central area of necrosis that appears irregular, amorphous, and pink.Grossly, areas of caseation appear cheese-like.

• 图示干酪样肉芽肿，中央是不规则，无结构，粉红色的坏死物，类上皮细胞分布在周围。坏死物看上去很像干酪。