Vascular Pathology Practice Questions

Q: A 36-year-old woman presents with muscle pain, fever, and chronic sinusitis. Physical examination shows mucosal ulcerations of the nasopharynx. A biopsy from her nasopharynx reveals necrotizing vasculitis with chronic inflammatory cells and giant cells surrounding necrotic areas. The presence of which of the following autoantibodies would be most consistent with a diagnosis of Wegener's granulomatosis?

Antineutrophil cytoplasmic antibodies. The clinical presentation of chronic sinusitis, nasopharyngeal ulcerations, and biopsy findings of necrotizing granulomatous vasculitis with giant cells [1] is classic for **Granulomatosis with Polyangiitis (GPA)**, formerly known as **Wegener’s granulomatosis**. **1. Why the Correct Answer is Right:** GPA is a small-vessel vasculitis characterized by a "triad" of involvement: upper respiratory tract, lower respiratory tract (lungs), and kidneys (glomerulonephritis) [1]. The hallmark laboratory marker for GPA is **Antineutrophil Cytoplasmic Antibodies (ANCA)**. Specifically, GPA is most strongly associated with **c-ANCA (cytoplasmic pattern)**, which targets the enzyme **Proteinase-3 (PR3)** [1]. In active systemic GPA, c-ANCA has a sensitivity of over 90%. **2. Why the Incorrect Options are Wrong:** * **Antigliadin antibodies (A):** These are associated with **Celiac disease**, an autoimmune-mediated enteropathy triggered by gluten. * **Antinucleolar antibodies (B):** These are a subtype of Antinuclear Antibodies (ANA) seen in systemic sclerosis (**Scleroderma**), particularly the diffuse form. * **Antimitochondrial antibodies (D):** This is the highly specific hallmark for **Primary Biliary Cholangitis (PBC)**. **3. NEET-PG High-Yield Pearls:** * **GPA Triad:** Nasopharynx (saddle nose deformity), Lungs (hemoptysis/cavitation), and Kidney (RPGN/Crescentic GN) [1]. * **Microscopic Polyangiitis (MPA) vs. GPA:** MPA lacks granulomas and is associated with **p-ANCA (anti-MPO)**. * **Churg-Strauss (EGPA):** Characterized by asthma, eosinophilia, and p-ANCA. * **Treatment:** The standard induction therapy for GPA involves **Cyclophosphamide** or Rituximab combined with corticosteroids. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 519-520.

Q: What is the commonest site for glomangioma?

Nail bed. **Explanation:** **Glomus tumor (Glomangioma)** is a benign, exquisitely painful vascular neoplasm arising from the modified smooth muscle cells of the **glomus body** [1]. The glomus body is a specialized arteriovenous anastomosis involved in thermoregulation. 1. **Why the Nail Bed is Correct:** Glomus bodies are found in highest concentration in the dermis of the distal portions of the fingers and toes. Therefore, the **subungual region (nail bed)** is the most characteristic and commonest site for these tumors. They typically present as a small, firm, red-blue nodule under the nail. 2. **Why Other Options are Incorrect:** * **Head and Neck / Chest Wall:** While glomus tumors can occur anywhere in the skin or soft tissues, these are not the primary or most frequent locations. * **Retroperitoneal:** This is an extremely rare site. Deep-seated glomus tumors are uncommon and usually occur in the gastrointestinal tract (specifically the stomach) rather than the retroperitoneum. **High-Yield Clinical Pearls for NEET-PG:** * **Classic Triad:** Paroxysmal pain, localized point tenderness, and sensitivity to cold. * **Hildreth’s Sign:** Relief of pain upon application of a tourniquet (positive in glomus tumors). * **Histology:** Nests of uniform, round "glomus cells" with "punched-out" nuclei surrounding thin-walled vascular vascular spaces. * **Immunohistochemistry (IHC):** Glomus cells are positive for **Alpha-Smooth Muscle Actin (α-SMA)** and Type IV Collagen (pericellular staining), but negative for endothelial markers like CD31 (which stain the vessels, not the tumor cells). **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 523-524.

Q: Kaposi's sarcoma is associated with which of the following conditions?

HIV. **Explanation:** **Kaposi’s Sarcoma (KS)** is a vascular neoplasm caused by **Human Herpesvirus 8 (HHV-8)**, also known as Kaposi Sarcoma-associated Herpesvirus (KSHV). While HHV-8 is the primary oncogenic driver, the clinical manifestation of the disease is heavily dependent on the host's immune status. **Why HIV is the correct answer:** The most common and aggressive form of the disease is **AIDS-associated (Epidemic) Kaposi’s Sarcoma** [1]. In patients with HIV, the profound depletion of CD4+ T-cells and the presence of the HIV-Tat protein synergize with HHV-8 to promote spindle cell proliferation and angiogenesis. It is currently the most common neoplasm associated with HIV/AIDS and is considered an **AIDS-defining illness** [1]. **Analysis of Incorrect Options:** * **Bronchial Asthma:** This is a chronic inflammatory airway disease with no known association with HHV-8 or vascular malignancies. * **Hepatitis B:** While HBV is strongly associated with Hepatocellular Carcinoma (HCC), it does not play a role in the pathogenesis of Kaposi’s Sarcoma. * **Hairy Cell Leukaemia:** This is a rare B-cell lymphoproliferative disorder characterized by the BRAF V600E mutation; it is not linked to HHV-8. **Clinical Pearls for NEET-PG:** * **Morphology:** Presents as painless, non-blanching, violaceous (purple) macules, plaques, or nodules [1]. * **Histology:** Characterized by **spindle-shaped cells**, slit-like vascular spaces, and extravasated RBCs. * **Four Clinical Variants:** 1. Classic (Elderly Mediterranean men), 2. Endemic (African), 3. Iatrogenic (Transplant-related), 4. AIDS-associated [1]. * **Treatment:** Highly Active Antiretroviral Therapy (HAART) is the first-line management for AIDS-related KS. For localized lesions, intralesional vinblastine or cryotherapy is used; systemic chemotherapy (Liposomal Doxorubicin) is reserved for visceral involvement.

Q: Lipid-engorged macrophages are killed by which of the following?

Unesterified cholesterol. ### Explanation The correct answer is **Unesterified cholesterol (Free Cholesterol)**. **Mechanism of Cytotoxicity:** In the pathogenesis of atherosclerosis, macrophages take up oxidized LDL via scavenger receptors, becoming "foam cells." Under normal conditions, the enzyme **ACAT (Acyl-CoA:cholesterol acyltransferase)** converts excess free cholesterol into cholesteryl esters for safe storage in lipid droplets. However, when the influx of cholesterol exceeds the capacity of ACAT or when the hydrolysis of esters back to free cholesterol is accelerated, **unesterified (free) cholesterol** accumulates in the endoplasmic reticulum (ER) membrane. This accumulation triggers the **unfolded protein response (UPR)** and induces **ER stress**, leading to macrophage apoptosis (programmed cell death). This process contributes to the formation of the necrotic core in advanced atherosclerotic plaques. **Analysis of Incorrect Options:** * **A & B (Lipoproteins):** Lipoproteins (like LDL or HDL) are transport vehicles. While they deliver lipids to the macrophage, they are not the direct intracellular mediators of cell death. * **D (Esterified cholesterol):** This is the storage form of cholesterol. It is relatively inert and stored safely in cytoplasmic droplets; it does not trigger the ER stress pathways that lead to cell death. **High-Yield Clinical Pearls for NEET-PG:** * **Scavenger Receptors (SR-A, CD36):** Unlike the LDL receptor, these are **not** down-regulated by high intracellular cholesterol, leading to massive lipid loading. * **ACAT vs. LCAT:** Remember that **ACAT** works *inside* cells (macrophages/liver), while **LCAT** (Lecithin-cholesterol acyltransferase) works in the *plasma* (associated with HDL). * **Atherosclerosis Progression:** Macrophage death by free cholesterol is a key step in converting a stable fatty streak into a vulnerable, necrotic fibroatheroma.

Question 1

A 36-year-old woman presents with muscle pain, fever, and chronic sinusitis. Physical examination shows mucosal ulcerations of the nasopharynx. A biopsy from her nasopharynx reveals necrotizing vasculitis with chronic inflammatory cells and giant cells surrounding necrotic areas. The presence of which of the following autoantibodies would be most consistent with a diagnosis of Wegener's granulomatosis?

Accepted Answer

Antineutrophil cytoplasmic antibodies

Answer

Antigliadin antibodies

Answer

Antinucleolar antibodies

Answer

Antimitochondrial antibodies

Question 2

What is the primary mechanism by which smoking accelerates vascular injury?

Accepted Answer

Promoting endothelial dysfunction

Answer

Retention of sodium

Answer

Increased aldosterone production

Answer

Increasing plasma catecholamines

Question 3

What is the commonest site for glomangioma?

Accepted Answer

Nail bed

Answer

Head and neck

Answer

Chest wall

Answer

Retroperitoneal

Question 4

p-ANCA positivity is specific for which of the following conditions?

Accepted Answer

Wegener's granulomatosis

Answer

Polyarteritis nodosa

Answer

Henoch-Schonlein purpura

Answer

Churg-Strauss syndrome

Question 5

Kaposi's sarcoma is associated with which of the following conditions?

Accepted Answer

HIV

Answer

Bronchial asthma

Answer

Hepatitis B

Answer

Hairy cell leukaemia

Question 6

Which of the following statements regarding Kaposi's Sarcoma is true?

Accepted Answer

Has increasing incidence among AIDS patients.

Answer

Does not occur in non-HIV positive persons.

Answer

No gastrointestinal bleeding.

Answer

Uncommon among homosexual HIV positive individuals.

Question 7

A study is conducted involving persons with LDL cholesterol levels above 160 mg/dL. These individuals have increased oxidized LDL deposited in their arteries, leading to decreased arterial lumen size, particularly at branch points. Which of the following is the most likely initial pathologic change in these areas of arterial narrowing?

Accepted Answer

Intimal thickening

Answer

Endothelial cell disruption

Answer

Lymphocytic infiltrates

Answer

Platelet aggregation

Question 8

Hyperplastic arteriolitis with necrotizing arteriolitis is seen in?

Accepted Answer

Malignant hypertension

Answer

Buerger's disease

Answer

Benign hypertension

Answer

Diabetes

Question 9

Lipid-engorged macrophages are killed by which of the following?

Accepted Answer

Unesterified cholesterol

Answer

Unesterified lipoprotein

Answer

Esterified lipoprotein

Answer

Esterified cholesterol

Question 10

Which of the following cells does not participate in atherogenesis?

Accepted Answer

Neutrophil

Answer

Platelet

Answer

Monocyte

Answer

Smooth muscle

Vascular Pathology — MCQs

Vascular Pathology — MCQs

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