On hematoxylin-eosin staining, the fibrin ring granuloma consists of a central lipid vacuole (usually washed-out during fixing and staining, leaving only an empty hole) surrounded by a dense red fibrin ring and epithelioid macrophages.
In hematoxylin-eosin staining, the fibrin ring granuloma contains a central lipid vacuole (usually removed during fixation and staining), surrounded by a dense red fibrin ring and epithelioid macrophages.