Centrilobular necrosis is seen in
**Core Concept**
Centrilobular necrosis is a type of liver cell injury that occurs in the central zone of the hepatic lobule, often due to ischemia or hypoxia. It is characterized by the death of hepatocytes in the zone I of the liver lobule, which is rich in oxygen supply.
**Why the Correct Answer is Right**
Centrilobular necrosis is typically seen in conditions that cause a sudden decrease in oxygen supply to the liver, such as carbon tetrachloride poisoning, acetaminophen overdose, or shock. The central zone of the liver lobule is particularly vulnerable to ischemia due to its high oxygen demand. The lack of oxygen leads to the activation of pro-apoptotic enzymes, such as caspase-3, and the inhibition of anti-apoptotic pathways, resulting in the death of hepatocytes.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because centrilobular necrosis is not typically associated with viral hepatitis, which usually causes a more widespread pattern of liver injury.
**Option B:** This option is incorrect because fatty change, also known as steatosis, is a distinct type of liver injury that involves the accumulation of fat droplets in hepatocytes, rather than necrosis.
**Option C:** This option is incorrect because sinusoidal obstruction syndrome, also known as veno-occlusive disease, is a type of liver injury that occurs due to the obstruction of small hepatic veins, rather than ischemia or hypoxia.
**Clinical Pearl / High-Yield Fact**
Centrilobular necrosis is often referred to as "centrilobular hemorrhagic necrosis" due to the characteristic appearance of the liver on histopathology, which shows a mixture of necrotic hepatocytes and hemorrhage in the central zone of the liver lobule.
**Correct Answer: A. Carbon tetrachloride poisoning is a classic cause of centrilobular necrosis.**