Vascular Pathology — MCQs

Vascular Pathology Indian Medical PG Practice Questions and MCQs

Question 221: Medial thickening of arteries with an onion-skin appearance on biopsy is diagnostic of which condition in an elderly male presenting with uncontrolled hypertension and signs of renal failure?

A. Thromboangiitis obliterans
B. Arteriosclerosis obliterans
C. Hyperplastic arteriosclerosis (Correct Answer)
D. Hyaline arteriosclerosis

Explanation: **Explanation:** The correct answer is **Hyperplastic Arteriosclerosis**. This condition is the hallmark of **malignant hypertension** (typically BP >200/120 mmHg). **1. Why it is correct:** In response to severe, acute elevations in blood pressure, smooth muscle cells in the arterial media proliferate and migrate [2]. This results in concentric, laminated thickening of the vessel wall, classically described as an **"onion-skin" appearance** [1]. This process leads to luminal narrowing and distal ischemia, which in the kidneys manifests as acute renal failure (nephrosclerosis) [1]. Histologically, it may be accompanied by **fibrinoid necrosis** (necrotizing arteriolitis) [1], [2]. **2. Why other options are incorrect:** * **Hyaline Arteriosclerosis:** Characterized by pink, amorphous, homogeneous thickening of the arteriolar wall due to plasma protein leakage [2], [3]. It is associated with **benign hypertension** and diabetes mellitus, rather than the acute "onion-skin" proliferation [2]. * **Thromboangiitis Obliterans (Buerger Disease):** A segmental, thrombosing, acute and chronic inflammation of medium and small-sized arteries, primarily in young heavy smokers. It does not show concentric medial thickening. * **Arteriosclerosis Obliterans:** A general term for peripheral artery disease (PAD) caused by atherosclerosis, characterized by intimal plaques rather than medial "onion-skinning." **3. NEET-PG High-Yield Pearls:** * **Hyaline = Benign** hypertension; **Hyperplastic = Malignant** hypertension [1]. * **Kidney Appearance:** Malignant hypertension causes a **"flea-bitten kidney"** (pinpoint petechial hemorrhages on the cortical surface). * **Key Histology:** Onion-skinning involves the proliferation of **smooth muscle cells** and basement membrane reduplication [2]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, p. 945. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 498-499. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 943-945.

Question 222: A 78-year-old male presents with headache, visual disturbance, and tenderness over his right temporal region. A biopsy taken from his right temporal artery is most likely to show what?

A. Acute organizing thrombus formation
B. Granulomatous inflammation with giant cells (Correct Answer)
C. Luminal thrombosis
D. Aneurysmal dilatation with subintimal inflammation

Explanation: **Explanation:** The clinical presentation of an elderly patient (typically >50 years) with a new-onset headache, visual disturbances, and localized tenderness over the temporal artery is classic for **Giant Cell Arteritis (GCA)**, also known as Temporal Arteritis [1][2]. **1. Why the Correct Answer is Right:** GCA is a chronic inflammatory disease of large-to-medium-sized arteries. The hallmark histopathological finding is **granulomatous inflammation** within the inner portion of the media, centered on the internal elastic lamina [1]. This often involves an infiltrate of lymphocytes, macrophages, and **multinucleated giant cells** (found in ~75% of cases), leading to fragmentation of the internal elastic lamina [1][2]. **2. Why the Incorrect Options are Wrong:** * **Option A & C:** While luminal narrowing and secondary thrombosis can occur due to intimal thickening, they are non-specific complications [1]. The *primary* diagnostic pathology is the transmural inflammation, not the thrombus itself. * **Option D:** Aneurysmal dilatation is more characteristic of Polyarteritis Nodosa (PAN) or Kawasaki disease [3]. GCA typically causes stenotic/occlusive lesions rather than aneurysms in the temporal branches. **3. High-Yield Clinical Pearls for NEET-PG:** * **Association:** Strongly associated with **Polymyalgia Rheumatica (PMR)** (proximal muscle pain and morning stiffness) [2]. * **Diagnosis:** The gold standard is a **temporal artery biopsy**. Due to the "segmental" nature of the lesions (**skip lesions**), a long segment of the artery (2-3 cm) must be biopsied to avoid false negatives. * **Lab Marker:** Characteristically shows a **markedly elevated ESR** (often >100 mm/hr) [2]. * **Emergency Management:** If GCA is suspected, start **high-dose corticosteroids immediately** to prevent permanent blindness (ophthalmic artery occlusion) [3]. Do not wait for biopsy results. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 516-517. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Osteoarticular And Connective Tissue Disease, pp. 686-687. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Osteoarticular And Connective Tissue Disease, pp. 688-689.

Question 223: Which of the following does not lead to increased formation of thrombus?

A. Malignancy
B. Decreased blood volume
C. Decreased blood flow
D. Hyperglycemia (Correct Answer)

Explanation: ### Explanation The formation of a thrombus is governed by **Virchow’s Triad**, which consists of three primary factors: **Endothelial injury, Stasis (abnormal blood flow), and Hypercoagulability.** [2] **Why Hyperglycemia is the Correct Answer:** While chronic hyperglycemia in diabetes mellitus contributes to atherosclerosis and long-term vascular damage [3], it is **not a direct acute trigger** for thrombus formation in the same way the other options are. In the context of Virchow’s Triad, hyperglycemia does not inherently cause immediate hypercoagulability or stasis [2]. In fact, severe hyperglycemia often leads to osmotic diuresis and dehydration; if blood volume is significantly depleted without a compensatory increase in viscosity or stasis, it does not meet the classic criteria for acute thrombosis. **Analysis of Incorrect Options:** * **Malignancy:** Many tumors (especially adenocarcinomas) secrete procoagulant substances (e.g., tissue factor, mucin) that lead to a systemic hypercoagulable state, known as **Trousseau syndrome** (migratory thrombophlebitis). [1] * **Decreased Blood Volume:** Significant dehydration or hemorrhage leads to **hemoconcentration** and increased blood viscosity. This slows down microcirculation, promoting stasis and platelet aggregation. * **Decreased Blood Flow:** Stasis is a pillar of Virchow’s Triad. It prevents the dilution of activated clotting factors and inhibits the inflow of clotting inhibitors, directly leading to thrombus formation (common in bedridden patients or atrial fibrillation). [2] **High-Yield Clinical Pearls for NEET-PG:** * **Virchow’s Triad:** Endothelial injury is the most important factor for arterial thrombosis; Stasis is the most important for venous thrombosis. [2] * **Lines of Zahn:** These are characteristic laminations (pale platelet/fibrin layers vs. dark RBC layers) found only in thrombi formed in **flowing blood**, helping distinguish them from post-mortem clots. * **Factor V Leiden:** The most common inherited cause of hypercoagulability (thrombophilia). **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 522-523. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Hemodynamic Disorders, Thromboembolic Disease, and Shock, pp. 132-133. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Endocrine System, pp. 1118-1119.

Question 224: Which of the following is NOT seen in malignant hypertension?

A. Fibrinoid necrosis
B. Hyaline arteriosclerosis (Correct Answer)
C. Necrotizing glomerulonephritis
D. Hyperplastic arteriosclerosis

Explanation: **Explanation:** Malignant hypertension (accelerated hypertension) is a medical emergency characterized by a sudden, severe rise in blood pressure (usually >200/120 mmHg) [1]. It leads to acute vascular injury, whereas **Hyaline Arteriosclerosis** is a hallmark of **benign hypertension** and diabetes mellitus [2]. **Why Hyaline Arteriosclerosis is the correct answer:** In chronic, low-grade (benign) hypertension, plasma components leak across the endothelium due to hemodynamic stress, leading to the deposition of pink, amorphous hyaline material in the arteriolar walls [2]. This process is slow and results in luminal narrowing but not acute necrosis. **Analysis of Incorrect Options:** * **Hyperplastic Arteriosclerosis:** This is the classic morphological feature of malignant hypertension. It involves "onion-skin" concentric laminations of smooth muscle cells and basement membrane thickening in response to acute pressure overload [3]. * **Fibrinoid Necrosis:** In malignant hypertension, the rapid rise in pressure causes direct damage to the vessel wall, leading to the leakage of plasma proteins (including fibrin) and cell death [1]. This appears as bright pink, smudgy material on H&E stain. * **Necrotizing Glomerulonephritis:** The combination of fibrinoid necrosis and hyperplastic changes in the renal arterioles leads to "flea-bitten kidney" (petechial hemorrhages) and necrotizing changes in the glomeruli [3]. **High-Yield Clinical Pearls for NEET-PG:** * **Benign Hypertension:** Hyaline Arteriosclerosis (Slow, protein leakage) [2]. * **Malignant Hypertension:** Hyperplastic Arteriosclerosis + Fibrinoid Necrosis (Rapid, proliferative/necrotic) [3]. * **Flea-bitten Kidney:** Seen in Malignant Hypertension, Infective Endocarditis, and PSGN. * **Onion-skinning:** Characteristic of Hyperplastic Arteriosclerosis [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, p. 945. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 943-945. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 498-499.

Question 225: Polyarteritis Nodosa (PAN) typically involves which of the following?

A. Large elastic arteries
B. Small- or medium-sized muscular arteries (Correct Answer)
C. Arterioles
D. Capillaries

Explanation: **Explanation:** **Polyarteritis Nodosa (PAN)** is a systemic necrotizing vasculitis that characteristically involves **small- or medium-sized muscular arteries** (Option B) [1]. The underlying pathology involves segmental, transmural fibrinoid necrosis [1]. A key feature of PAN is that it affects vessels at different stages of development simultaneously—ranging from acute inflammation to fibrous thickening [1]. This leads to weakening of the arterial wall, resulting in characteristic "beaded" aneurysms seen on angiography [1]. **Why other options are incorrect:** * **Option A (Large elastic arteries):** These are involved in Large Vessel Vasculitis, such as **Takayasu Arteritis** and **Giant Cell (Temporal) Arteritis**. * **Options C & D (Arterioles and Capillaries):** PAN is strictly a medium-vessel vasculitis. It **spares** the smallest vessels (arterioles, capillaries, and venules) [2]. Involvement of these microvessels, particularly in the lungs, is a hallmark of **Microscopic Polyangiitis (MPA)**, not PAN [2]. **High-Yield Clinical Pearls for NEET-PG:** * **Hepatitis B Association:** Approximately 30% of PAN cases are associated with chronic Hepatitis B surface antigen (HBsAg) positivity [3]. * **Organ Sparing:** PAN characteristically **spares the pulmonary circulation** (no primary lung involvement). * **Renal Involvement:** It commonly affects renal arteries (leading to hypertension), but it **does not cause glomerulonephritis** (since it spares capillaries). * **ANCA Status:** PAN is typically **ANCA-negative**, distinguishing it from MPA and Granulomatosis with Polyangiitis (GPA). * **Classic Image:** "Rosary sign" or "string of pearls" on angiography due to multiple aneurysms. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 517-518. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 518-519. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Osteoarticular And Connective Tissue Disease, pp. 687-688.

Question 226: Which of the following is seen in hyperemia?

A. Decreased arteriolar blood flow to the tissue
B. Increased arteriolar blood flow to the tissue (Correct Answer)
C. Increased venous blood flow in the tissue
D. Decreased venous blood flow in the tissue

Explanation: **Explanation:** **Hyperemia** is an **active process** characterized by an increase in blood volume within a particular tissue [2], [3]. It occurs due to **arteriolar dilation**, which leads to an **increased inflow of arterial blood** into the capillary beds [3]. This results in the tissue appearing redder (erythematous) because of the engorgement with oxygenated blood [1]. Common physiological examples include skeletal muscle during exercise or skin during blushing; pathological examples include the early stages of inflammation [1], [2]. **Analysis of Options:** * **Option B (Correct):** Hyperemia is defined by the active dilation of arterioles, leading to increased blood flow into the tissue [3]. * **Option A:** Decreased arteriolar flow would lead to ischemia, not hyperemia. * **Options C & D:** These relate to **Congestion**, which is a **passive process**. Congestion results from impaired venous outflow (e.g., in cardiac failure or venous obstruction). Unlike hyperemia, congested tissue appears blue-blue/red (cyanosis) due to the accumulation of deoxygenated hemoglobin. **High-Yield Clinical Pearls for NEET-PG:** * **Active vs. Passive:** Hyperemia is **Active** (Arterial inflow ↑); Congestion is **Passive** (Venous outflow ↓). * **Color Clue:** Hyperemia = **Red** (Oxygenated blood); Congestion = **Blue/Cyanotic** (Deoxygenated blood). * **Chronic Passive Congestion (CPC):** Frequently tested in the context of the **"Nutmeg Liver"** (seen in Right Heart Failure) and **"Heart Failure Cells"** (hemosiderin-laden macrophages in the lungs seen in Left Heart Failure). **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 185-186. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 186-187. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, pp. 84-85.

Question 227: Which of the following statements regarding aneurysms is FALSE?

A. A true aneurysm contains all three layers of the arterial wall.
B. In dissecting aneurysms, the media layer is defective.
C. Charcot-Bouchard aneurysms are typically found in the brain.
D. Saccular aneurysms involve the entire circumference of the vessel wall. (Correct Answer)

Explanation: **Explanation:** The correct answer is **D**. This statement is false because **saccular aneurisms** (also known as berry aneurisms) are spherical outpocketings that involve only a **portion or a segment** of the vessel wall [1]. In contrast, **fusiform aneurisms** involve the **entire circumference** of the vessel, resulting in a symmetrical, spindle-shaped dilation [1]. **Analysis of other options:** * **Option A (True):** By definition, a **true aneurysm** involves an intact but attenuated arterial wall containing all three layers: intima, media, and adventitia (e.g., atherosclerotic or congenital aneurysms) [1]. A "false" aneurysm (pseudoaneurysm) is a wall defect leading to an extravascular hematoma [1]. * **Option B (True):** Aortic dissection occurs when blood enters the media through an intimal tear [1]. The underlying pathology is often **cystic medial degeneration**, where the elastic tissue of the media is defective or fragmented. * **Option C (True):** **Charcot-Bouchard aneurysms** are microaneurysms occurring in small perforating arteries (like lenticulostriate arteries) of the brain [3]. They are strongly associated with chronic hypertension and are a common cause of intracerebral hemorrhage [3]. **NEET-PG High-Yield Pearls:** * **Most common site for Atherosclerotic Aneurysm:** Abdominal Aorta (infra-renal) [4]. * **Most common site for Berry Aneurysm:** Anterior communicating artery (Circle of Willis) [2]. * **Syphilitic (Luetic) Aneurysms:** Characteristically involve the **ascending aorta** and show a "tree-bark" appearance due to obliterative endarteritis of the vasa vorum [3]. * **Mycotic Aneurysms:** Result from bacterial or fungal infections weakening the vessel wall, often secondary to infective endocarditis [4]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 509-510. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Central Nervous System, p. 1272. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Cardiovascular Disease, pp. 273-274. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 510-511.

Question 228: Which of the following are risk factors for Angiosarcoma?

A. Polyvinyl chloride
B. Arsenic
C. Thorotrast
D. All of the above (Correct Answer)

Explanation: ### Explanation **Angiosarcoma** is a highly aggressive, malignant vascular neoplasm arising from endothelial cells [3]. While it can occur anywhere, it most commonly affects the skin, soft tissues, breast, and liver. **Why "All of the Above" is Correct:** Hepatic angiosarcoma is classically associated with specific environmental and occupational carcinogens. The underlying mechanism involves chronic exposure leading to DNA damage in the sinusoidal endothelial cells of the liver. * **Polyvinyl Chloride (PVC):** Workers in the plastics industry exposed to vinyl chloride monomer have a significantly increased risk. * **Arsenic:** Historically found in pesticides (Fowler’s solution) and contaminated well water [2]. * **Thorotrast:** A radioactive contrast medium (thorium dioxide) used in radiology between the 1920s and 1950s; it emits alpha particles and has an extremely long half-life, leading to tumors decades after exposure [1]. **Clinical Pearls for NEET-PG:** 1. **Immunohistochemistry (IHC):** Angiosarcomas are positive for endothelial markers—**CD31** (most specific), **CD34**, and **von Willebrand factor** [3]. 2. **Post-Radiation Angiosarcoma:** A high-yield association is angiosarcoma of the breast occurring several years after radical mastectomy and radiation therapy for breast cancer. 3. **Stewart-Treves Syndrome:** This refers to angiosarcoma arising in a limb with chronic lymphedema (classically post-mastectomy). 4. **Morphology:** Look for "anastomosing vascular channels" lined by atypical, pleomorphic endothelial cells with high mitotic activity [3]. **Summary:** For NEET-PG, remember the "Triple Threat" for Hepatic Angiosarcoma: **VAT** (**V**inyl Chloride, **A**rsenic, **T**horotrast). **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 216-217. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, p. 286. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 527-528.

Question 229: An elderly man presents with a history of abdominal pain. He is found to have a fusiform dilatation of the descending aorta. What is the likely cause?

A. Trauma
B. Atherosclerosis (Correct Answer)
C. Right ventricular failure
D. Syphilitic aortitis

Explanation: **Explanation:** **Atherosclerosis** is the most common cause of **Abdominal Aortic Aneurysms (AAA)** [1]. In elderly patients, atherosclerotic plaques lead to the destruction and thinning of the underlying aortic media. This results in a loss of elastic tissue and structural integrity, causing the vessel wall to weaken and dilate under arterial pressure, typically forming a **fusiform** (spindle-shaped) dilatation. These are most commonly located between the renal arteries and the aortic bifurcation [1]. **Analysis of Incorrect Options:** * **Trauma:** Usually results in a "false aneurysm" (pseudoaneurysm) or an aortic dissection/transection, typically following deceleration injuries (e.g., RTA) at the aortic isthmus, rather than a chronic fusiform dilatation [1]. * **Right Ventricular Failure:** This leads to systemic venous congestion (e.g., Nutmeg liver, pedal edema) but has no pathological role in the formation of arterial aneurysms. * **Syphilitic Aortitis:** Classically causes aneurysms of the **ascending aorta** (thoracic aorta) due to endarteritis obliterans of the vasa vasorum. It is much less common than atherosclerosis in the descending/abdominal aorta [3]. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site of AAA:** Infra-renal abdominal aorta [1]. * **Risk Factors:** Smoking (strongest), male gender, age >65, and hypertension [1], [3]. * **Triad of Ruptured AAA:** Sudden onset severe abdominal/back pain, hypotension (shock), and a pulsatile abdominal mass [2]. * **Morphology:** Atherosclerotic aneurysms are usually fusiform, whereas mycotic (infective) aneurysms are often saccular. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 510-511. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Cardiovascular Disease, pp. 271-272. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 511-512.

Question 230: Which infective agent is implicated in causing atherosclerosis?

A. Mycoplasma pneumoniae
B. Chlamydia pneumoniae (Correct Answer)
C. Haemophilus influenzae
D. Corynebacterium diphtheriae

Explanation: ### **Explanation** **Correct Option: B. Chlamydia pneumoniae** Atherosclerosis is primarily a chronic inflammatory response of the arterial wall to endothelial injury. While traditional risk factors (hyperlipidemia, hypertension, smoking) are paramount, the **"Infectious Theory of Atherosclerosis"** suggests that certain pathogens contribute to plaque formation and instability [1]. *Chlamydia pneumoniae* is the most strongly implicated agent. It has been detected within atherosclerotic plaques using PCR and electron microscopy. The mechanism involves the induction of chronic inflammation, pro-inflammatory cytokine release, and the promotion of foam cell formation by infecting macrophages and vascular smooth muscle cells [1]. **Analysis of Incorrect Options:** * **A. Mycoplasma pneumoniae:** While it causes atypical pneumonia, there is no established clinical or pathological evidence linking it to the pathogenesis of atherosclerosis. * **C. Haemophilus influenzae:** This is a common respiratory pathogen (causing pneumonia, meningitis, and epiglottitis) but does not play a role in chronic vascular inflammation. * **D. Corynebacterium diphtheriae:** It produces a potent exotoxin that can cause **myocarditis** (acute toxic damage), but it is not associated with the chronic, fibro-fatty process of atherosclerosis. **High-Yield NEET-PG Pearls:** * **Other implicated agents:** Besides *C. pneumoniae*, **Cytomegalovirus (CMV)** and **Helicobacter pylori** have also been studied for potential roles in atherosclerosis [1]. * **CRP Connection:** High-sensitivity C-reactive protein (hs-CRP) is a key marker of the systemic inflammation that drives atherosclerosis and is a strong predictor of myocardial infarction risk. * **Key Pathological Step:** The hallmark of early atherosclerosis is the **"Fatty Streak,"** which is composed of lipid-laden macrophages known as **Foam Cells**. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Cardiovascular Disease, pp. 270-271.

Practice by Chapter

Atherosclerosis

Practice Questions

Hypertensive Vascular Disease

Practice Questions

Aneurysms and Dissection

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Vasculitis

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Venous Disease and Thrombosis

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Vascular Tumors

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Varicose Veins and Lymphatics

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Pathology of Vascular Interventions

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Vascular Diseases in Specific Organs

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Congenital Vascular Anomalies

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