<prompt> Fibrinoid necrosis is seen in all EXCEPT-Polyarteritis nodosaSLEHBVSarcoidosis  <response>: Ans. is d i.e., Sarcoidosis Fibrinoid necrosis o Fibrinoid necrosis is special form of necrosis usually seen in immune reactions involving blood vessels, o This pattern of necrosis typically occurs when complexes of antigen and antibodies are deposited in the walls of arteries. o Deposits of these immune complexes, together with fibrin that has leaked out of vessels, result in a bright pink and amorphous appearance in H E stains, called fibrinoid fibrin-like by pathologists, o It is seen in Immune complex vasculitis Malignant hypertension. o Deposition of immune complexes, together with fibrin, results in bright pink and amorphous appearance in H E stain, called fibrinoid fibrin-like. o Diseases with fibrinoid necrosis: Malignant hypertension SLE PAN SABE Acute rheumatic fever Aschoffs nodule HBV Rheumatoid arthritis Near peptic ulcer Henoch-schonlein purpura Malignancy 