**Question:** White infarcts are seen in all of the following organs, EXCEPT:

A. Liver
B. Heart
C. Kidney
D. Brain

**Core Concept:** White infarcts are areas of ischemic injury characterized by necrosis of the affected tissues. They typically occur due to a reduced blood supply or occlusion of blood vessels supplying the affected organ. In this context, we are considering white infarcts seen in the liver, heart, kidney, and brain.

**Why the Correct Answer is Right:** The correct answer, D. Brain, is excluded because white infarcts in the brain are known as ischemic strokes. Ischemic strokes occur when blood flow to the brain is compromised, leading to tissue damage. Unlike white infarcts in other organs, ischemic strokes are typically not caused by reduced blood supply but by an occlusion of the blood vessels supplying the brain.

**Why Each Wrong Option is Incorrect:**

A. Liver: White infarcts can occur in the liver due to reduced blood flow, leading to necrosis of hepatocytes. This is a common finding in conditions like portal hypertension, Budd-Chiari syndrome, or occlusion of the hepatic artery.

B. Heart: White infarcts in the heart are known as myocardial infarctions. They result from a reduced blood supply to the heart muscle, leading to cell necrosis and tissue damage.

C. Kidney: White infarcts in the kidney are known as acute tubular necrosis (ATN). They are caused by a reduction in renal blood flow, leading to ischemic injury and cell necrosis in the renal tubules.

**Clinical Pearl:**

Understanding the underlying causes of white infarcts in various organs is crucial for diagnosis and management of related conditions. For example, recognizing white infarcts in the liver or kidney can help identify conditions like portal hypertension or nephrotoxic agents, respectively. In contrast, ischemic strokes in the brain often require urgent medical attention and intervention.

**Correct Answer:** D. Brain (ischemic stroke)

White infarcts in the brain are typically caused by an occlusion of the blood vessels supplying the brain. This distinction is essential as ischemic strokes require immediate medical attention and intervention, while infarcts in other organs can have different etiologies and management strategies.