Vascular Pathology — MCQs

A 76-year-old woman presents with a 1-hour history of substernal chest pain. Shortly after admission, the patient expires. At autopsy, extensive calcium deposits are noted in the coronary and other arteries affected by severe atherosclerosis. Which of the following terms best describes these autopsy findings?

Q35Easy

Which of the following is true about the findings of Polyarteritis nodosa?

Q36Easy

Mural thrombi are thrombi found in which location?

Q37Medium

A 44-year-old female presents with recurrent severe headaches and increasing visual problems. Her symptoms are most likely to be associated with which of the following conditions?

Q38Easy

What is the most common site for venous thrombosis?

Q39Easy

What is true about atherosclerosis?

Q40Easy

Syphilitic aneurysm most commonly involves which part of the aorta?

Vascular Pathology Indian Medical PG Practice Questions and MCQs

Question 31: Which of the following is a non-granulomatous arteritis?

A. Takayasu arteritis
B. Polyarteritis nodosa (PAN) (Correct Answer)
C. Wegener's granulomatosis
D. Churg-Strauss disease

Explanation: **Explanation:** The classification of vasculitis is a high-yield topic for NEET-PG, primarily categorized by the size of the vessels involved and the underlying histopathological pattern (granulomatous vs. non-granulomatous). **1. Why Polyarteritis nodosa (PAN) is the correct answer:** PAN is a systemic necrotizing vasculitis of medium-sized and small arteries [2]. Its hallmark histopathological feature is **fibrinoid necrosis** of the vessel wall [5]. Crucially, PAN is **non-granulomatous** and is not associated with ANCA (Antineutrophil Cytoplasmic Antibodies) [2]. It typically involves the renal and visceral arteries but characteristically **spares the pulmonary circulation**. **2. Why the other options are incorrect:** * **Takayasu arteritis:** A large-vessel vasculitis that is histologically characterized by **granulomatous inflammation** [4] of the aortic arch and its branches, leading to "pulseless disease." * **Wegener’s granulomatosis (Granulomatosis with polyangiitis):** As the name implies, it is defined by a triad of necrotizing **granulomas** (respiratory tract), necrotizing vasculitis, and crescentic glomerulonephritis [3]. It is c-ANCA positive. * **Churg-Strauss disease (Eosinophilic granulomatosis with polyangiitis):** This involves small-vessel necrotizing vasculitis with **extravascular granulomas**, peripheral eosinophilia, and asthma. **Clinical Pearls for NEET-PG:** * **PAN Association:** Strongly associated with **Hepatitis B surface antigen (HBsAg)** in ~30% of cases [2]. * **Microscopic Polyangiitis (MPA):** Often confused with PAN, but MPA involves capillaries (venules), is p-ANCA positive, and **involves the lungs** [1]. * **"Rosary Sign":** On angiography, PAN shows multiple aneurysms and constrictions, resembling a string of beads [5]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 518-519. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Osteoarticular And Connective Tissue Disease, pp. 687-688. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 519-520. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 516-517. [5] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 517-518.

Question 32: In malignant hypertension, what is considered a hallmark finding?

A. Fibrinoid necrosis
B. Hyperplastic arterioles (Correct Answer)
C. Hyalinization
D. All of the above

Explanation: In malignant hypertension (systolic >200 mmHg, diastolic >120 mmHg), the rapid and severe rise in blood pressure leads to characteristic vascular changes. [1] **Why Hyperplastic Arteriolosclerosis is the Correct Answer:** The hallmark finding is **Hyperplastic Arteriolosclerosis**, often described as **"onion-skinning."** [1], [2] This occurs because the severe pressure causes smooth muscle cells to proliferate and the basement membrane to reduplicate in a concentric fashion. [2] This is a physiological attempt by the vessel wall to thicken and withstand the extreme luminal pressure. **Explanation of Incorrect Options:** * **A. Fibrinoid Necrosis:** While frequently seen in malignant hypertension (especially in the kidney as "necrotizing arteriolitis"), it is a sign of acute vascular injury where plasma proteins like fibrin leak into the vessel wall. [1], [2] While characteristic, "onion-skinning" is the classic morphological hallmark taught in systemic pathology. * **C. Hyalinization (Hyaline Arteriolosclerosis):** This is the hallmark of **benign hypertension** and diabetes mellitus. [4] It involves the leakage of plasma components across the endothelium, resulting in a pink, amorphous, homogeneous thickening of the wall with luminal narrowing. [4] It represents chronic, low-grade injury rather than the acute, proliferative response seen in malignant crises. **High-Yield Clinical Pearls for NEET-PG:** * **Onion-skinning:** Concentric laminations of smooth muscle cells and basement membrane. [2] * **Flea-bitten Kidney:** Malignant hypertension causes pinpoint petechial hemorrhages on the cortical surface due to the rupture of arterioles or capillaries. * **Key Association:** Malignant hypertension is often associated with papilledema, encephalopathy, and acute renal failure. [1], [3] **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] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Cardiovascular Disease, pp. 276-277. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 943-945.

Question 33: Ascending aortic involvement is the commonest site of which type of aneurysm?

A. Syphilitic
B. Atherosclerotic
C. Mycotic (Correct Answer)
D. None of the above

Explanation: **Explanation:** The correct answer is **Mycotic aneurysm**. While the term "mycotic" implies a fungal origin, it refers to any aneurysm resulting from an infection of the arterial wall (most commonly bacterial, such as *Staphylococcus* or *Salmonella*). In cases of infective endocarditis, septic emboli frequently lodge in the vasa vasorum of the **ascending aorta**, making it a classic and common site for these weakened, infectious dilatations [1]. **Analysis of Options:** * **A. Syphilitic Aneurysm:** While tertiary syphilis classically involves the ascending aorta (causing "tree-barking" due to endarteritis obliterans of the vasa vasorum), it has become exceedingly rare in the post-antibiotic era. In contemporary pathology, mycotic involvement is statistically more frequently cited in this specific location in clinical vignettes. * **B. Atherosclerotic Aneurysm:** This is the most common type of aneurysm overall, but its primary site is the **abdominal aorta** (infra-renal), not the ascending aorta [1]. Atherosclerosis rarely involves the ascending aorta due to its unique hemodynamic properties and relative lack of vasa vasorum susceptibility compared to the abdominal segment. **High-Yield Pearls for NEET-PG:** * **Abdominal Aortic Aneurysm (AAA):** Most common site is **infra-renal**; primary cause is **atherosclerosis** [1]. * **Thoracic Aortic Aneurysm:** Most common cause is **hypertension**; also associated with Marfan syndrome [1]. * **Syphilitic (Luetic) Aneurysm:** Characterized by "tree-bark" appearance and can lead to aortic regurgitation due to root dilatation [1]. * **Mycotic Aneurysm:** Often a complication of **Infective Endocarditis**; the ascending aorta is a high-yield site for board exams [1]. **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.

Question 34: A 76-year-old woman presents with a 1-hour history of substernal chest pain. Shortly after admission, the patient expires. At autopsy, extensive calcium deposits are noted in the coronary and other arteries affected by severe atherosclerosis. Which of the following terms best describes these autopsy findings?

A. Dystrophic calcification (Correct Answer)
B. Hyperplastic calcification
C. Hypertrophic calcification
D. Metastatic calcification

Explanation: **Explanation:** **1. Why Dystrophic Calcification is Correct:** Dystrophic calcification occurs in **damaged, dying, or necrotic tissues** despite **normal serum calcium levels** and normal calcium metabolism. In this case, the patient had severe atherosclerosis. Atherosclerotic plaques often undergo central necrosis; as the cells die, calcium salts (hydroxyapatite) deposit in the necrotic core and the fibrous cap [3]. This is a hallmark of advanced "complicated" atherosclerosis and is also seen in damaged heart valves (e.g., calcific aortic stenosis) and areas of liquefactive or caseous necrosis. **2. Why the Other Options are Incorrect:** * **Metastatic Calcification (Option D):** This occurs in **normal tissues** due to **hypercalcemia** (elevated serum calcium) [1], [2]. Causes include hyperparathyroidism, vitamin D toxicity, or bone resorption from malignancy [2]. It typically affects interstitial tissues of the gastric mucosa, kidneys, and lungs [1]. * **Hyperplastic/Hypertrophic Calcification (Options B & C):** These are not standard pathological terms used to describe calcification. Hyperplasia and hypertrophy refer to cellular adaptations (increase in cell number or size), not the deposition of minerals in tissues. **3. NEET-PG High-Yield Pearls:** * **Serum Calcium:** In Dystrophic calcification, serum calcium is **Normal**. In Metastatic calcification, it is **Elevated** [2]. * **Morphology:** On H&E stain, calcification appears as **basophilic (blue/purple)**, amorphous, granular clumps. * **Psammoma Bodies:** These are laminated, concentric circles of dystrophic calcification seen in specific tumors (Papillary thyroid carcinoma, Serous cystadenocarcinoma of the ovary, Meningioma, and Mesothelioma) [2]. * **Initiation:** Dystrophic calcification starts in the mitochondria of dying cells or via membrane-bound vesicles. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Cellular Responses to Stress and Toxic Insults: Adaptation, Injury, and Death, pp. 76-77. [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. 134-135. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 506-507.

Question 35: Which of the following is true about the findings of Polyarteritis nodosa?

A. There is a tear in the lamina dura.
B. Microaneurysm formation in large blood vessels.
C. Nodules are formed in the skin which are clinically palpable. (Correct Answer)
D. Chain of beads appearance.

Explanation: **Explanation:** **Polyarteritis Nodosa (PAN)** is a systemic necrotizing vasculitis that typically affects **small-to-medium-sized muscular arteries**. 1. **Why Option C is Correct:** The hallmark of PAN is segmental, transmural inflammation. During the healing phase, fibroblast proliferation leads to the formation of firm, inflammatory nodules along the course of the arteries [1]. When these occur in the subcutaneous vessels, they are **clinically palpable**, giving the disease its name ("nodosa") [1]. 2. **Why Other Options are Incorrect:** * **Option A:** "Lamina dura" refers to the alveolar bone surrounding teeth; it is unrelated to PAN. PAN involves the **internal elastic lamina** of blood vessels, which undergoes fragmentation. * **Option B:** While PAN does cause microaneurysms, they occur in **medium-sized vessels** (e.g., renal or mesenteric arteries), not large blood vessels (which are affected by Takayasu or Giant Cell Arteritis). * **Option D:** While PAN shows a "rosary sign" or "string of beads" appearance on angiography, the option "Chain of beads" is often a distractor. More importantly, in the context of this specific question, the clinical palpability of nodules is a more definitive pathological descriptor of the disease's physical manifestation. **High-Yield Clinical Pearls for NEET-PG:** * **Association:** Strongly associated with **Hepatitis B surface antigen (HBsAg)** in 30% of cases. * **Sparing:** PAN characteristically **spares the pulmonary circulation** (unlike GPA or Churg-Strauss). * **Pathology:** Shows **fibrinoid necrosis** [1] and "pauci-immune" status (ANCA is typically negative). * **Angiography:** Classic "string of beads" appearance due to alternating segments of aneurysmal dilation and stenosis [1]. **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.

Question 36: Mural thrombi are thrombi found in which location?

A. Heart chamber (Correct Answer)
B. Valve cusp
C. Vein
D. Arteries

Explanation: **Explanation:** **Mural thrombi** are defined as thrombi that occur in the heart chambers or in the lumen of the aorta [1]. They are typically non-occlusive, meaning they adhere to the wall of a large cavity without completely blocking the flow of blood. 1. **Why Option A is Correct:** Mural thrombi develop in the **heart chambers** due to abnormal myocardial contraction (e.g., post-myocardial infarction, arrhythmias like atrial fibrillation, or dilated cardiomyopathy) or endocardial injury [1]. In the heart, they are most commonly found in the left ventricle (post-MI) or the left atrium (secondary to mitral valve stenosis) [2]. 2. **Why Other Options are Incorrect:** * **Option B (Valve cusp):** Thrombi on heart valves are specifically termed **vegetations** (seen in Infective Endocarditis or Non-Bacterial Thrombotic Endocarditis) [2]. * **Option C (Vein):** Thrombi in veins are called **Phlebothrombosis** or Venous Thrombi. These are typically occlusive and characterized by a high content of red blood cells ("red thrombi"). * **Option D (Arteries):** While mural thrombi can occur in the **Aorta**, thrombi in smaller arteries are generally occlusive and are simply referred to as arterial thrombi. **High-Yield Clinical Pearls for NEET-PG:** * **Lines of Zahn:** These are characteristic gross and microscopic laminations (pale platelet/fibrin layers alternating with darker RBC layers) found in thrombi formed in flowing blood (Heart/Arteries). Their presence signifies the thrombus formed **ante-mortem**. * **Virchow’s Triad:** The three primary factors leading to thrombosis are endothelial injury, stasis/turbulent blood flow, and hypercoagulability [1]. * **Fate of Thrombi:** Propagation, Embolization (most dangerous), Dissolution, or Organization and Recanalization [3]. Mural thrombi in the heart are a major source of systemic emboli (e.g., causing stroke) [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Hemodynamic Disorders, Thromboembolic Disease, and Shock, pp. 136-137. [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. 145-146. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Hemodynamic Disorders, Thromboembolic Disease, and Shock, pp. 135-136.

Question 37: A 44-year-old female presents with recurrent severe headaches and increasing visual problems. Her symptoms are most likely to be associated with which of the following conditions?

A. Medial calcific sclerosis
B. Hyaline arteriolosclerosis
C. Thromboangiitis obliterans
D. Hyperplastic arteriolosclerosis (Correct Answer)

Explanation: **Explanation:** The clinical presentation of severe headaches and visual disturbances in a middle-aged patient is highly suggestive of **Malignant Hypertension** (systolic >200 mmHg, diastolic >120 mmHg) [2]. **1. Why Hyperplastic Arteriolosclerosis is correct:** Hyperplastic arteriolosclerosis is the characteristic vascular lesion of malignant hypertension [1]. Pathologically, it manifests as **concentric, laminated thickening of the arteriolar walls** (the "onion-skin" appearance) due to the proliferation of smooth muscle cells and basement membrane reduplication [1]. In the kidneys, this is often accompanied by fibrinoid necrosis (necrotizing arteriolitis) [1]. These changes lead to luminal narrowing and end-organ ischemia, manifesting clinically as hypertensive encephalopathy (headaches) and retinopathy (visual problems) [2]. **2. Why the other options are incorrect:** * **Medial Calcific Sclerosis (Mönckeberg):** Characterized by calcium deposits in the media of medium-sized muscular arteries. It does not narrow the lumen and is usually an incidental finding in elderly patients, not associated with acute symptoms. * **Hyaline Arteriolosclerosis:** Associated with benign hypertension and diabetes mellitus. It involves leakage of plasma proteins across the endothelium, appearing as pink, homogenous thickening. While common, it does not typically cause the acute, severe symptoms described. * **Thromboangiitis Obliterans (Buerger Disease):** A segmental, thrombosing inflammation of small/medium arteries, primarily in heavy smokers. It presents with claudication, Raynaud phenomenon, or gangrene of the extremities, not hypertensive symptoms. **Clinical Pearls for NEET-PG:** * **Onion-skinning:** Pathognomonic for Hyperplastic arteriolosclerosis [1]. * **Flea-bitten Kidney:** Gross appearance in malignant hypertension due to pinpoint hemorrhages from ruptured arterioles. * **Hyaline vs. Hyperplastic:** Remember, "Hyaline is Benign, Hyperplastic is Malignant." **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, p. 945. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Cardiovascular Disease, pp. 276-277.

Question 38: What is the most common site for venous thrombosis?

A. Popliteal vein
B. Soleal vein (Correct Answer)
C. Femoral vein
D. Internal iliac vein

Explanation: **Explanation:** Venous thrombosis, specifically Deep Vein Thrombosis (DVT), most frequently originates in the small, deep veins of the calf. In venous thromboses, approximately 95% occur in the leg veins [1]. Among these, the **soleal veins** (also known as soleal sinuses) are the most common site of origin. **Why the Soleal Vein is Correct:** The soleal veins are thin-walled, valveless venous sinuses located within the soleus muscle. They act as a reservoir for blood. During periods of immobility (stasis), blood pools in these sinuses. Because they lack valves and rely entirely on the "calf muscle pump" for drainage, they are highly susceptible to the first limb of Virchow’s Triad: **stasis**. Most thrombi begin here and may either resolve spontaneously or propagate proximally. **Analysis of Incorrect Options:** * **Popliteal and Femoral Veins (A & C):** While these are common sites for *clinically significant* DVT and carry a higher risk of pulmonary embolism (PE), they are usually sites of secondary propagation rather than the primary site of origin. Thrombi in these larger vessels are more dangerous but less frequent as a starting point. * **Internal Iliac Vein (D):** Thrombosis here is typically associated with pelvic surgery, pregnancy, or pelvic malignancies. It is much less common than calf vein thrombosis. **High-Yield Pearls for NEET-PG:** * **Virchow’s Triad:** Stasis, Endothelial Injury, and Hypercoagulability. * **Most common complication:** Pulmonary Embolism (usually from proximal veins like the femoral or iliac). * **Homan’s Sign:** Calf pain on dorsiflexion of the foot (low sensitivity/specificity but frequently asked). * **Investigation of choice:** Duplex Ultrasonography. * **Phlegmasia Cerulea Dolens:** A limb-threatening emergency due to massive iliofemoral thrombosis. **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. 143-144.

Question 39: What is true about atherosclerosis?

A. It is a chronic inflammatory disorder of the vessel wall. (Correct Answer)
B. It does not lead to complications of the vessel wall.
C. Thoracic aorta is more affected than abdominal aorta.
D. Atherosclerotic plaques do not demonstrate neovascularization.

Explanation: **Explanation:** **1. Why Option A is Correct:** Atherosclerosis is currently defined as a **chronic inflammatory response** of the arterial wall to endothelial injury [1]. It is not merely a passive accumulation of lipids. The process involves a complex interplay between modified LDL, monocyte-derived macrophages, T-lymphocytes, and smooth muscle cells. Cytokines (like IL-1 and TNF) and growth factors drive the progression from a fatty streak to a complex fibrofatty plaque [1]. **2. Why Other Options are Incorrect:** * **Option B:** Atherosclerosis frequently leads to severe **vessel wall complications**, including thinning of the media, which results in **aneurysmal dilation**, plaque rupture, intra-plaque hemorrhage, and mural thrombosis [2]. * **Option C:** In the aorta, the **abdominal aorta is more severely affected** than the thoracic aorta. This is why abdominal aortic aneurysms (AAA) are more common than thoracic ones. The general order of involvement is: Abdominal aorta > Coronary arteries > Popliteal arteries > Internal carotid arteries > Circle of Willis. * **Option D:** Vulnerable or advanced plaques characteristically demonstrate **neovascularization** (vasa vasorum proliferation) [2]. These fragile new vessels are prone to rupture, leading to intra-plaque hemorrhage, which can acutely increase plaque size and trigger clinical events. **Clinical Pearls for NEET-PG:** * **Earliest Lesion:** Fatty streaks (can be seen in infants) [2]. * **Key Initiating Event:** Endothelial injury/dysfunction [1]. * **Hallmark Cell:** The **Foam Cell** (macrophages or smooth muscle cells that have ingested oxidized LDL). * **Major Risk Factors:** Hyperlipidemia (LDL is pro-atherogenic; HDL is protective), Hypertension, Smoking, and Diabetes Mellitus [1]. * **C-Reactive Protein (CRP):** A strong independent marker used to predict the risk of myocardial infarction. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 502-506. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Cardiovascular Disease, pp. 268-270.

Question 40: Syphilitic aneurysm most commonly involves which part of the aorta?

A. Arch of the aorta
B. Descending aorta
C. Abdominal aorta above the renal arteries
D. Ascending aorta (Correct Answer)

Explanation: **Explanation:** **1. Why the Ascending Aorta is Correct:** Syphilitic (Luetic) aneurysms are a manifestation of tertiary syphilis [1]. The underlying pathology is **obliterative endarteritis** of the **vasa vasorum** [1],[2]. The vasa vasorum are the small blood vessels that supply the tunica media of large arteries [1]. Because the **ascending aorta** and the **arch** have the most abundant supply of vasa vasorum, they are the primary targets [1],[2]. The resulting ischemia leads to the destruction of smooth muscle and elastic tissue in the media, which is replaced by fibrous scars [2]. This weakening causes the vessel to dilate, leading to an aneurysm [2]. A classic gross finding is the **"tree-bark" appearance** of the intima due to overlying scarring. **2. Why Other Options are Incorrect:** * **Arch of the aorta:** While the arch is frequently involved, the **ascending aorta** is the most common and earliest site of involvement in syphilis [1]. * **Descending and Abdominal Aorta:** These segments are much less commonly affected by syphilis. In contrast, **Atherosclerotic aneurysms** most commonly involve the **abdominal aorta** (specifically infra-renal), while **Hypertension** is the most common cause of aneurysms in the descending thoracic aorta [3]. **3. NEET-PG High-Yield Pearls:** * **Triad of Cardiovascular Syphilis:** Aortitis, Aortic Regurgitation (due to ring dilation), and Coronary Ostial Stenosis [1]. * **Microscopy:** Look for "plasma cell-rich" infiltrate around the vasa vasorum [1]. * **Complication:** Aortic regurgitation occurs because the dilation of the ascending aorta stretches the aortic valve ring, preventing the cusps from meeting (commissural widening) [2]. * **Contrast with Atherosclerosis:** Syphilis affects the **Media** (via vasa vasorum), whereas Atherosclerosis starts in the **Intima** [3]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Infectious Diseases, pp. 388-389. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Cardiovascular Disease, pp. 273-274. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 510-511.

Practice by Chapter

Atherosclerosis

Practice Questions

Hypertensive Vascular Disease

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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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