Liquefactive necrosis does not include:1, coagulative necrosis, is in the exogenous stimuli such as local ischemia and hypoxia, bacterial toxin infection, some physical and chemical injury, resulting in cell death of the common type, often occurs in the heart, liver, spleen and kidneys, and other substantial organs, but does not include the brain.2, fibrinoid necrosis, for the connective tissues and the wall of the small blood vessels are common types of necrosis, most often seen in metabolic diseases such as rheumatic diseases, Nodular arteritis, acute hypertension.3, caseous necrosis, for the death of tuberculosis caused by tuberculosis mycobacterium tuberculosis, disintegration release more lipids, exist in necrotic tissues, plus itself contains more inhibitory hydrolysis enzyme active substances, so that it is not autolytic also not be absorbed, common in tumors, tuberculosis-like leprosy.4, gangrene, refers to the secondary accompanied by the putrefactive bacterial infection of the large piece of necrotic tissue, is divided into dry gangrene , wet gangrene and gas gangrene three types.