Types of necrosis

1. Coagulative necrosis is the most common type of necrosis resulting from ischemia. It preserves the basic cell outlines.

2. Caseous necrosis is characterized by a cheese-like appearance and is most commonly associated with granulomatous inflammation in tuberculosis.

3. Liquefactive necrosis occurs when enzymatic digestion dominates, such as in the brain, where high lipid content leads to tissue softening and fluidity.

4. Fat necrosis occurs in the pancreas during acute pancreatitis due to the action of lipases, leading to fatty acid release and calcium deposition (saponification).

5. Fibrinoid necrosis involves immune complexes and fibrin deposition in vessel walls, as seen in vasculitis like polyarteritis nodosa.