Vascular Pathology Practice Questions

Q: Which of the following changes does NOT occur in malignant hypertension?

Hyaline arteriosclerosis. **Explanation:** Malignant hypertension (hypertensive emergency) is characterized by a sudden, severe rise in blood pressure (typically >200/120 mmHg), leading to acute vascular injury. The hallmark of this condition is **acute** hemodynamic stress, whereas **Hyaline arteriosclerosis** is a feature of **benign hypertension** or diabetes mellitus [1]. **1. Why Hyaline Arteriosclerosis is the Correct Answer:** Hyaline arteriosclerosis occurs due to chronic, long-standing "leakage" of plasma components across the vascular endothelium, resulting in pink, homogeneous thickening of the arteriolar walls [1]. It is a slow, degenerative process associated with chronic hypertension, not the acute, necrotizing injury seen in malignant hypertension. **2. Analysis of Other Options:** * **Fibrinoid necrosis (Option B):** This is the pathognomonic lesion of malignant hypertension. Acute pressure elevation causes necrosis of the vessel wall with accumulation of plasma proteins (fibrin), giving it a bright pink, granular appearance. * **Intimal concentric thickening (Option C):** Also known as **"Onion-skinning,"** this is a proliferative response to acute injury where smooth muscle cells migrate and proliferate in the intima, creating concentric layers. * **Petechial hemorrhages (Option D):** The rupture of necrotic arterioles and capillaries on the kidney's cortical surface leads to a "flea-bitten kidney" appearance, a classic gross finding in malignant hypertension. **NEET-PG High-Yield Pearls:** * **Flea-bitten Kidney:** Seen in Malignant Hypertension, Infective Endocarditis, and PSGN. * **Onion-skinning:** Characteristic of Hyperplastic Arteriolosclerosis (Malignant HTN). * **Hyaline Arteriosclerosis:** Associated with Benign HTN and Diabetic Microangiopathy [1]. * **Key Clinical Feature:** Malignant HTN must be accompanied by end-organ damage (e.g., papilledema, encephalopathy, or acute kidney injury).

Q: Which of the following is NOT an ANCA-associated vasculitis?

Anti-GBM disease. The classification of small-vessel vasculitis is primarily based on the presence or absence of immune deposits. **ANCA-associated vasculitides (AAV)** are characterized by "pauci-immune" inflammation (minimal or no immunoglobulin deposition) and the presence of Antineutrophil Cytoplasmic Antibodies [3]. **Why Anti-GBM disease is the correct answer:** Anti-GBM (Glomerular Basement Membrane) disease, formerly known as Goodpasture’s syndrome, is **not** an ANCA-associated vasculitis. It is an **immune-complex mediated** disease caused by direct autoantibodies against the alpha-3 chain of Type IV collagen [3]. On immunofluorescence, it shows a characteristic **linear deposition** of IgG along the glomerular capillaries [1], unlike the "pauci-immune" (negative) staining seen in AAV. **Analysis of incorrect options:** * **A. Granulomatosis with polyangiitis (GPA):** Formerly Wegener’s. A classic AAV characterized by granulomatous inflammation of the respiratory tract and necrotizing vasculitis. * **B. Eosinophilic granulomatosis with polyangiitis (EGPA):** Formerly Churg-Strauss. An AAV characterized by asthma, peripheral eosinophilia, and granulomatous inflammation [2]. Associated with **p-ANCA (anti-MPO)** in about 40-50% of cases. * **C. Microscopic polyangiitis (MPA):** A necrotizing AAV that lacks granulomas. It frequently involves the kidneys (RPGN) and lungs. **High-Yield Clinical Pearls for NEET-PG:** * **Double Positive:** Approximately 10-40% of patients with Anti-GBM disease also test positive for ANCA (usually p-ANCA). These patients have a "dual-positive" profile and carry a prognosis intermediate between the two diseases. * **Pauci-immune Glomerulonephritis:** If a biopsy shows necrotizing crescentic GN with *negative* immunofluorescence, the diagnosis is almost always an ANCA-associated vasculitis [3]. * **C-ANCA vs. P-ANCA:** Remember **C**-ANCA for **C**entral (PR3) and **P**-ANCA for **P**eriduclear (MPO).

Q: IgA deposits are seen on a skin biopsy in which of the following conditions?

Henoch-Schonlein purpura. **Explanation:** **Henoch-Schönlein Purpura (HSP)**, also known as **IgA Vasculitis**, is the correct answer because it is a small-vessel vasculitis characterized by the deposition of **IgA-dominant immune complexes** in the walls of small vessels (capillaries, venules, or arterioles). On Direct Immunofluorescence (DIF) of a skin biopsy, the hallmark finding is granular IgA deposits within the dermal vessel walls. Clinically, this presents as the classic tetrad of palpable purpura, arthralgia, abdominal pain, and renal involvement (IgA nephropathy). **Analysis of Incorrect Options:** * **B. Giant Cell Arteritis:** This is a large-vessel vasculitis. Diagnosis is made via temporal artery biopsy showing granulomatous inflammation; it is not characterized by IgA deposits. * **C. Microscopic Polyangiitis (MPA):** This is a small-vessel vasculitis associated with **p-ANCA** (anti-MPO). It is a "pauci-immune" vasculitis, meaning there are little to no immunoglobulin deposits on immunofluorescence. * **D. Wegener’s Granulomatosis (GPA):** Now called Granulomatosis with Polyangiitis, this is a small-vessel vasculitis associated with **c-ANCA** (anti-PR3). Like MPA, it is pauci-immune and lacks significant IgA deposition. **High-Yield Clinical Pearls for NEET-PG:** * **DIF in Dermatology:** IgA deposits are also the hallmark of **Dermatitis Herpetiformis** (granular deposits at the tips of dermal papillae) and **Linear IgA Bullous Dermatosis** (linear deposits along the BMZ). * **HSP Trigger:** Often follows an Upper Respiratory Tract Infection (URTI). * **Biopsy Timing:** For vasculitis, the best site for biopsy is a fresh lesion (<24–48 hours old) to capture the immune deposits before they are degraded by inflammation.

Q: Which of the following does NOT predispose to atherosclerosis?

Calcium. **Explanation:** The correct answer is **Calcium**. In the context of atherosclerosis, calcium is a **marker** of the disease process rather than a **predisposing risk factor**. Vascular calcification occurs as a late-stage phenomenon where calcium hydroxyapatite deposits in the necrotic core of an existing atherosclerotic plaque. While a high "Calcium Score" on a CT scan indicates the presence and extent of coronary artery disease, dietary or serum calcium levels do not initiate or predispose an individual to the formation of plaques. **Analysis of Incorrect Options:** * **Homocysteinemia:** High levels of homocysteine cause endothelial dysfunction and oxidative stress, promoting lipid peroxidation and plaque formation. It is a well-recognized independent risk factor. * **Fibrinogen:** As a key coagulation factor, elevated fibrinogen increases blood viscosity and promotes platelet aggregation and thrombus formation over atherosclerotic lesions. * **Lipoprotein (a) [Lp(a)]:** This is a low-density lipoprotein variant containing apolipoprotein(a). It is highly atherogenic because it is pro-inflammatory and structurally resembles plasminogen, thereby inhibiting fibrinolysis and promoting thrombosis. **Clinical Pearls for NEET-PG:** * **Lp(a):** Known as the "independent genetic risk factor" for premature coronary artery disease. * **Homocysteine:** Metabolism requires Vitamin B12, B6, and Folate; deficiencies in these vitamins lead to hyperhomocysteinemia. * **Coronary Artery Calcium (CAC) Score:** Used for risk stratification in asymptomatic patients, but remember: *Calcification stabilizes the plaque; it does not cause it.*

Q: A 30-year-old AIDS patient presents with complaints as shown below. All are true about the condition except?

Benign tumor. ***Benign tumor*** - **Kaposi's sarcoma** is a **malignant vascular tumor** characterized by abnormal proliferation of endothelial cells, making the statement that it's a benign tumor incorrect. - The lesions shown in the image (purplish-red to brownish plaques and nodules on the lower leg, typical in an AIDS patient) are highly suggestive of Kaposi's sarcoma, which is definitively not benign. *Vascular tumor* - **Kaposi's sarcoma** is indeed a **vascular tumor** that arises from endothelial cells and is characterized by the formation of new blood vessels. - The appearance of the lesions in the image, with their characteristic color and nodular/plaque-like morphology, is consistent with their vascular origin. *Not seen in transfusion related AIDS* - **Kaposi's sarcoma** can occur in individuals with **AIDS resulting from any mode of transmission**, including transfusion-related AIDS, as it is linked to the immunosuppression caused by HIV, not the specific mode of acquisition. - While it's more commonly associated with certain risk groups (e.g., homosexual men), the underlying immunosuppression is the key factor, meaning it can manifest regardless of how HIV was acquired. *HHV 8* - **Kaposi's sarcoma** is strongly associated with and considered a B-cell lymphotropic infection caused by the **Human Herpesvirus 8 (HHV-8)**, also known as Kaposi's sarcoma-associated herpesvirus (KSHV). - HHV-8 infection is a prerequisite for the development of Kaposi's sarcoma, particularly in immunocompromised individuals like those with AIDS.

Q: A 62-year-old man presented in the medical emergency with complaints of severe headache and dizziness. His blood pressure was recorded to be 200/146 mm Hg. Pathological slide presentation is given in the image below. What is the most likely diagnosis?

Hyperplastic arteriolosclerosis. ***Hyperplastic arteriolosclerosis*** - The patient's severe hypertension (200/146 mm Hg) is characteristic of a **hypertensive crisis**, which is the typical setting for hyperplastic arteriolosclerosis [2]. - This condition is characterized by **concentric, laminated thickening of arteriole walls** (onion-skinning) due to proliferation of smooth muscle cells and reduplication of the basement membrane, often leading to luminal narrowing [1][2]. *Hyaline arteriolosclerosis* - This condition is typically associated with **benign hypertension** or diabetes, not the severe, acute hypertension seen in this case [2]. - It involves a **homogenous, pink, hyaline thickening** of arteriole walls due to plasma protein leakage and increased extracellular matrix, without the prominent cellular proliferation. *Accumulation of plasma proteins in the vessel wall* - While plasma protein accumulation does occur in hyaline arteriolosclerosis, it is a **component of the change**, not the primary diagnosis for the described severe hypertension and likely histological appearance. - This description is too general and does not capture the specific cellular and structural changes seen in severe hypertensive vasculopathy. *Neutrophilic infiltration* - **Neutrophilic infiltration** is characteristic of acute inflammation or vasculitis, such as in conditions like polyarteritis nodosa or ANCA-associated vasculitis. - It is **not a feature of hypertensive arteriolosclerosis**, which is a non-inflammatory vascular change due to chronic or severe pressure stress. **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.

Question 1

All endothelial cells are involved in the production of thrombomodulin EXCEPT those found in:

Accepted Answer

Cerebral microcirculation

Answer

Hepatic circulation

Answer

Cutaneous circulation

Answer

Renal circulation

Question 2

Which of the following changes does NOT occur in malignant hypertension?

Accepted Answer

Hyaline arteriosclerosis

Answer

Petechial hemorrhages on cortical surface

Answer

Fibrinoid necrosis of arterioles

Answer

Intimal concentric thickening

Question 3

Which of the following is NOT an ANCA-associated vasculitis?

Accepted Answer

Anti-GBM disease

Answer

Granulomatosis with polyangiitis

Answer

Eosinophilic granulomatosis with polyangiitis

Answer

Microscopic polyangiitis

Question 4

What is the characteristic pathological feature of pyogenic granuloma?

Accepted Answer

Granulation tissue

Answer

Epithelioid cells

Answer

Cavernous hemangioma

Answer

Giant cells

Question 5

What is the characteristic pathological feature of pyogenic granuloma?

Accepted Answer

Granulation tissue

Answer

Epithelioid cells

Answer

Cavernous hemangioma

Answer

Giant cells

Question 6

IgA deposits are seen on a skin biopsy in which of the following conditions?

Accepted Answer

Henoch-Schonlein purpura

Answer

Giant cell arteritis

Answer

Microscopic polyangiitis

Answer

Wegener's granulomatosis

Question 7

Which of the following does NOT predispose to atherosclerosis?

Accepted Answer

Calcium

Answer

Homocysteinemia

Answer

Fibrinogen

Answer

Lipoprotein A

Question 8

What is the earliest lesion observed in atherosclerosis?

Accepted Answer

Fatty streaks

Answer

Intimal thickening

Answer

Fibrinoid necrosis

Answer

Plaque

Question 9

A 30-year-old AIDS patient presents with complaints as shown below. All are true about the condition except?

Accepted Answer

Benign tumor

Answer

Vascular tumor

Answer

Not seen in transfusion related AIDS

Answer

HHV 8

Question 10

A 62-year-old man presented in the medical emergency with complaints of severe headache and dizziness. His blood pressure was recorded to be 200/146 mm Hg. Pathological slide presentation is given in the image below. What is the most likely diagnosis?

Accepted Answer

Hyperplastic arteriolosclerosis

Answer

Hyaline arteriolosclerosis

Answer

Accumulation of plasma proteins in the vessel wall

Answer

Neutrophilic infiltration

Vascular Pathology — MCQs

Vascular Pathology — MCQs

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