A<unk> , also known as doughnut<unk> , is a histopathological finding that is characteristic of Q fever. On hematoxylin-eosin staining, the<unk>  consists of a central lipid vacuole (usually washed-out during fixing and staining, leaving only an empty hole) surrounded by a dense red<unk> <unk>  and epithelioid macrophages.<unk> s may also be seen in Hodgkin's disease and infectious mononucleosis.
Fibrin ring granuloma
Eosinophilic granuloma
Silicone granuloma
Silica granuloma
Central giant-cell granuloma
Perforating calcific elastosis
Acrokeratoelastoidosis of Costa
Peripheral giant-cell granuloma