Necrosis is the localized death of living tissue caused by lack of blood or oxygen and cannot be attributed to programmed cell death.
In Our Own Words
Necrosis is when cells die due to lack of oxygen or blood, rather than a normal, programmed cell death. Necrosis can be caused by many factors, including trauma, radiation or chronic disease.
When the cause is a lack of blood supply, it is known as gangrene. Patients with uncontrolled diabetes are at a higher risk for gangrene, for example, because infections may not get enough blood to heal properly.