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the localized death of living cells (as from infection or the interruption of blood supply) (同)mortification, gangrene, sphacelus
of damaged or necrotic tissue; cheeselike

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壊疽(えそ)

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2015/11/16 15:26:10」(JST)

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Caseous necrosis is a form of cell death in which the tissue maintains a cheese-like appearance.^[1] The dead tissue appears as a soft and white proteinaceous dead cell mass.

Causes

Frequently, caseous necrosis is encountered in the foci of tuberculous infections.^[2] It can also be caused by syphilis and certain fungi.

A similar appearance can be associated with histoplasmosis, cryptococcosis, and coccidioidomycosis.^[3]

Appearance

In caseous necrosis no histological architecture is preserved. On microscopic examination with H&E staining, it is characterized by acellular pink areas of necrosis surrounded by a granulomatous inflammatory process.

When the hilar lymph node for instance is infected with tuberculosis and leads to caseous necrosis, its gross appearance can be a cheesy tan to white, which is why this type of necrosis is often depicted as a combination of both coagulative and liquefactive necrosis.

However, in the lung, extensive caseous necrosis with confluent cheesy tan granulomas is typical. The tissue destruction is so extensive that there are areas of cavitation (also known as cystic spaces). See Ghon's complex.

Caseous necrosis in the lung
Caseous necrosis in the pleura
Caseous necrosis in the kidney

References

^ Robbins and Cotran: Pathologic Basis of Disease, 8th Ed. 2010. Pg. 16
^ Robbins and Cotran: Pathologic Basis of Disease, 8th Ed. 2010. Pg. 16
^ "Pulmonary Pathology". Retrieved 2008-11-21.

External links

Microscope images of caseous necrosis
Image of a hilar lymph node demonstrating caseous necrosis
Image of a caseating granuloma of tuberculosis in the adrenal gland

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