Fibrinoid necrosis may be observed in
Fibrinoid necrosis is a special form of necrosis, visible by light microscopy, usually in immune reactions in which complexes of antigens and antibodies are deposited in the walls of arteries. The deposited immune complexes, together with fibrin that has leaked out of vessels, produce a bright pink and amorphous appearance on H&E preparations called fibrinoid (fibrin-like) by pathologists
Malignant Hypertension
Polyarteritis nodosa
Aschoff bodies
All the above