Differential Diagnosis > Morphology > Reaction Patterns Expanded > Necrosis

Necrosis

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(~ eschar = a necrotic scab or crust)

•brown recluse spider bite

 

infectious:

•ecthyma gangrenosum also ecthyma and ecthyma contagiosum (orf) are eschars
•mucormycosis
•aspergillosis
•cryptococcal cellulitis
•rickettsial pox eschar
•necrotizing fasciitis
•clostridial soft tissue infections
•amebic (entamoeba histolytica) skin gangrene following bowel surgery

 

infectious inoculation:

•anthrax
•orf
•milkers nodule
•nocardiasis

 

vascular:

•antiphospholipid sx
•cryoglobulinemia
•calciphylaxis
•warfarin necrosis, heparin necrosis
•emboli (atherosclerotic, septic etc..)
•ischemic necrosis (atherosclerosis obliterans, thromboembolism)
•vasculitis (e.g.PAN)
•purpura fulminans