The image above compares a normal artery with a diseased artery. The pathological process depicted in the diseased artery, characterized by the 'Lipid deposit of plaque' leading to luminal narrowing, is most consistent with which of the following conditions?

Explanation

## Image Findings * The image presents a comparison between a normal artery and a diseased artery. * The **normal artery** on the left shows a wide, patent lumen with smooth inner walls, indicating unimpeded blood flow. * The **diseased artery** on the right demonstrates significant **luminal narrowing** of the vessel. * A prominent, yellowish **lipid deposit (plaque)** is clearly visible within the arterial wall, specifically protruding into and obstructing the lumen. * The label explicitly identifies this as a "Lipid deposit of plaque." ## Diagnosis **Key Point:** The image demonstrates **atherosclerosis**, which is characterized by the formation of lipid-rich plaques (atheromas) within the arterial intima, leading to luminal narrowing. Atherosclerosis is a chronic inflammatory disease affecting large and medium-sized arteries. It is defined by the formation of **atheromas**, which are fibrofatty plaques that develop in the **intima** (innermost layer) of the arterial wall. These plaques are composed of a lipid core (primarily cholesterol and cholesterol esters) covered by a fibrous cap. The image vividly illustrates this process, showing a distinct "Lipid deposit of plaque" causing significant reduction in the arterial lumen, which is the hallmark of atherosclerosis. This progressive narrowing can lead to reduced blood flow, ischemia, and various cardiovascular and cerebrovascular events. ## Differential Diagnosis | Feature | Atherosclerosis | Arteriolosclerosis | Monckeberg's Arteriosclerosis | Vasculitis | | :------------------ | :-------------------------------------------- | :----------------------------------------------------- | :----------------------------------------------------- | :----------------------------------------------------- | | **Vessel Size** | Large and medium-sized arteries | Small arteries and arterioles | Medium-sized muscular arteries | Variable, depending on type | | **Location of Lesion** | Intima (subendothelial) | Media and intima of arterioles | Media (tunica media) | All layers of vessel wall | | **Nature of Lesion** | Fibrofatty plaque (lipid core, fibrous cap) | Hyaline thickening or hyperplastic changes | Calcification of the media | Inflammation, necrosis, fibrinoid change | | **Luminal Effect** | Significant narrowing, potential occlusion | Luminal narrowing (hyaline or hyperplastic) | Usually non-obstructive | Variable, can cause stenosis, thrombosis, aneurysm | | **Image Findings** | Lipid plaque, luminal narrowing | Not depicted (would show diffuse wall thickening) | Not depicted (would show calcification in media) | Not depicted (would show inflammatory changes) | ## Clinical Relevance **Clinical Pearl:** Atherosclerosis is the leading cause of morbidity and mortality worldwide, responsible for conditions like coronary artery disease, myocardial infarction, stroke, peripheral artery disease, and aortic aneurysms. ## High-Yield for NEET PG **High-Yield:** The **intima** is the primary site of atherosclerotic plaque formation. The earliest lesion is the **fatty streak**, which can progress to a mature atheroma. **Key Point:** Major modifiable risk factors include hyperlipidemia (especially high LDL, low HDL), hypertension, smoking, and diabetes mellitus. ## Common Traps **Warning:** It is crucial to differentiate atherosclerosis from other forms of arteriosclerosis. While atherosclerosis is a type of arteriosclerosis (hardening of arteries), it is specifically characterized by intimal fibrofatty plaques, unlike arteriolosclerosis (affecting small vessels) or Monckeberg's arteriosclerosis (medial calcification). ## Reference [cite:Robbins Basic Pathology, 10th Ed, Ch 11, p. 385-390]