Vascular Pathology Practice Questions

Q: Which multifocal tumor of vascular origin is commonly seen in patients with AIDS?

Kaposi sarcoma. **Explanation:** **Kaposi Sarcoma (KS)** is the correct answer as it is the most common neoplasm associated with HIV/AIDS. It is a **multifocal tumor of vascular endothelial origin** caused by **Human Herpesvirus 8 (HHV-8)**, also known as Kaposi Sarcoma-associated Herpesvirus (KSHV). In AIDS patients, it typically presents as painless, reddish-purple skin nodules or plaques, but it can also involve the viscera (lungs, GI tract). It is considered an AIDS-defining illness. **Analysis of Incorrect Options:** * **Astrocytoma:** This is a primary brain tumor of glial origin. While HIV patients are at risk for various CNS issues, astrocytomas are not specifically linked to HIV or vascular proliferation. * **Gastric Carcinoma:** This is an epithelial malignancy. While HIV patients have a higher risk of certain GI cancers (like Lymphoma), gastric adenocarcinoma is not the classic vascular tumor associated with the virus. * **Primary CNS Lymphoma:** This is the second most common malignancy in AIDS patients (associated with **EBV**). However, it is a tumor of **lymphoid origin**, not vascular origin. **High-Yield Clinical Pearls for NEET-PG:** * **Histology:** Characterized by **spindle-shaped cells**, slit-like vascular spaces, and extravasated RBCs. * **Transmission:** HHV-8 is primarily transmitted through saliva and sexual contact. * **Other HHV-8 Associations:** Primary Effusion Lymphoma (PEL) and Multicentric Castleman Disease. * **Treatment:** Highly Active Antiretroviral Therapy (HAART) often leads to regression of lesions by boosting CD4 counts.

Q: A 60-year-old asymptomatic female shows the following change in the tunica media of blood vessels. What is the diagnosis?

Medial calcification. ***Medial calcification*** - **Mönckeberg's medial calcific sclerosis** presents as **calcium deposits** in the tunica media, appearing as **basophilic deposits** on H&E staining in elderly patients. - This condition is typically **asymptomatic** and does **not narrow the vessel lumen**, distinguishing it from intimal calcification seen in atherosclerosis. *Medial fibrosis* - Would show **collagen deposition** and **fibroblast proliferation** in the tunica media rather than calcium deposits. - Typically associated with **hypertensive vascular disease** and would appear **eosinophilic** on H&E staining, not basophilic. *Amyloidosis* - Characterized by **Congo red positive** deposits that show **apple-green birefringence** under polarized light. - **Amyloid deposits** would appear as **homogeneous eosinophilic material** on routine H&E staining, not calcium deposits. *None of the above* - The clinical presentation of an **asymptomatic elderly female** with tunica media changes is classic for **Mönckeberg's sclerosis**. - The **basophilic calcium deposits** in the media are pathognomonic for medial calcification, making this the correct diagnosis.

Q: Which of the following diseases is more common in patients with alpha-1 antitrypsin deficiency?

Granulomatosis with polyangiitis. **Explanation:** **Alpha-1 antitrypsin (AAT) deficiency** is primarily known for causing panacinar emphysema and liver cirrhosis [1]. However, it is also a well-recognized genetic risk factor for **Granulomatosis with Polyangiitis (GPA)**, formerly known as Wegener’s granulomatosis. **The Underlying Concept:** AAT is a potent inhibitor of **Proteinase 3 (PR3)**, an enzyme released by neutrophils. In AAT deficiency, there is insufficient inhibition of PR3. This leads to increased availability of PR3 to interact with the immune system, promoting the development of **PR3-ANCA (c-ANCA)** antibodies. These antibodies are the hallmark of GPA. Research shows that patients with the PiZ or PiS alleles of the SERPINA1 gene have a significantly higher risk of developing GPA compared to the general population. **Analysis of Incorrect Options:** * **Microscopic polyangiitis (MPA):** While MPA is a small-vessel vasculitis, it is typically associated with **MPO-ANCA (p-ANCA)**. The link between AAT deficiency and MPO-associated vasculitis is much weaker than its link with PR3-associated GPA. * **Eosinophilic granulomatosis with polyangiitis (EGPA):** Formerly Churg-Strauss, this is characterized by asthma and eosinophilia. It is not pathophysiologically linked to AAT deficiency. * **Goodpasture Syndrome:** This is caused by anti-glomerular basement membrane (anti-GBM) antibodies and does not involve the PR3 enzyme or ANCA-mediated pathways. **High-Yield Clinical Pearls for NEET-PG:** * **Classic Triad of GPA:** Upper respiratory tract (sinusitis/saddle nose), Lower respiratory tract (cavitation), and Kidneys (RPGN). * **Serology:** GPA is associated with **c-ANCA (anti-PR3)**; MPA and EGPA are associated with **p-ANCA (anti-MPO)**. * **AAT Deficiency Association:** Always remember the "P's": **P**anacinar emphysema, **P**R3-ANCA, and **P**as-positive globules in the liver.

Q: Epithelioid hemangioendothelioma of the nose is classified as which of the following?

Sarcoma. **Explanation:** **Epithelioid Hemangioendothelioma (EHE)** is a rare vascular neoplasm of intermediate malignancy. The correct classification is **Sarcoma** because it originates from mesenchymal tissue (specifically vascular endothelial cells). 1. **Why Sarcoma is Correct:** By definition, a sarcoma is a malignant tumor arising from mesenchymal cells (bone, cartilage, fat, muscle, or blood vessels). EHE is characterized by "epithelioid" endothelial cells that mimic epithelial cells in appearance but are positive for vascular markers like **CD31, CD34, and Factor VIII-related antigen**. It is considered an intermediate-grade vascular sarcoma, falling between a benign hemangioma and a highly aggressive angiosarcoma. 2. **Why Other Options are Incorrect:** * **Carcinoma:** These are malignant tumors of **epithelial** origin (e.g., Squamous Cell Carcinoma). While EHE has "epithelioid" features histologically, its lineage is endothelial (mesenchymal). * **Carcinosarcoma:** This is a true "mixed" tumor containing both malignant epithelial and malignant mesenchymal components. * **Hamartoma:** This is a benign, disorganized growth of mature native tissue. EHE is a neoplastic process with metastatic potential, not a developmental malformation. **High-Yield Clinical Pearls for NEET-PG:** * **Histology:** Look for "intracytoplasmic vacuoles" (lumina) containing red blood cells within epithelioid cells. * **Genetics:** Often associated with a specific translocation: **t(1;3)(p36;q25)** resulting in the **WWTR1-CAMTA1** fusion gene. * **Behavior:** It is locally invasive and has a metastatic rate of approximately 20-30%. * **Treatment:** Wide surgical excision is the primary modality; it is generally resistant to radiotherapy and chemotherapy.

Question 1

A 25-year-old male is brought to the emergency department 48 hours after sustaining a closed fracture of the right femur in a road traffic accident. He develops sudden onset confusion, petechial rash over the chest, and progressive hypoxia. Chest X-ray shows bilateral diffuse infiltrates. A lung biopsy specimen is stained with hematoxylin and eosin (H&E) on a paraffin section and examined (Image 1). Which of the following best explains the pathophysiological mechanism responsible for the pulmonary findings seen in this image?

Accepted Answer

A. Mechanical obstruction of pulmonary capillaries by marrow-derived neutral lipids released from fractured bone, triggering a secondary inflammatory cascade

Answer

B. Thrombotic occlusion of pulmonary arterioles by platelet-fibrin thrombi originating from deep venous thrombosis in the injured limb

Answer

C. Diffuse alveolar damage caused by direct aspiration of gastric contents following loss of consciousness at the time of injury

Answer

D. Immune complex deposition in pulmonary capillary walls triggering complement-mediated neutrophilic inflammation

Question 2

Kaposi's sarcoma is a tumor of which system?

Accepted Answer

Blood vessels

Answer

Reticuloendothelial system

Answer

Striated muscles

Answer

Smooth muscles

Question 3

A 55-year-old woman presents with several weeks of fever, abdominal pain, weight loss, and fatigue. Three days prior to assessment, she developed a left foot drop. Her blood pressure is 160/90 mm Hg and pulse is 80/min. Physical examination confirms left peroneal nerve damage and a bilateral sensory neuropathy in both legs. There are no skin rashes. Laboratory evaluation reveals an ESR of 105 mm/h, WBC of 14,000/mL, and negative serologic tests for antineutrophil cytoplasmic antibody (ANCA) and ANA. The eosinophil count is normal, and urinalysis is negative for casts, protein, and red cells. A clinical diagnosis of polyarteritis nodosa is made. Which of the following is the most likely mechanism for renal injury in this condition?

Accepted Answer

necrotizing vasculitis of vessels

Answer

nephrotic syndrome

Answer

diffuse glomerulonephritis

Answer

granuloma formation

Question 4

Which multifocal tumor of vascular origin is commonly seen in patients with AIDS?

Accepted Answer

Kaposi sarcoma

Answer

Astrocytoma

Answer

Gastric Carcinoma

Answer

Primary CNS lymphoma

Question 5

A 60-year-old asymptomatic female shows the following change in the tunica media of blood vessels. What is the diagnosis?

Accepted Answer

Medial calcification

Answer

Medial fibrosis

Answer

Amyloidosis

Answer

None of the above

Question 6

Which of the following diseases is more common in patients with alpha-1 antitrypsin deficiency?

Accepted Answer

Granulomatosis with polyangiitis

Answer

Goodpasture syndrome

Answer

Microscopic polyangiitis

Answer

Eosinophilic granulomatosis with polyangiitis

Question 7

A 60-year-old man has his left forearm amputated due to invasive rhabdomyosarcoma. The pathologist notes calcification in the wall of the radial artery, which otherwise appears unremarkable. Which of the following is the appropriate diagnosis?

Accepted Answer

Monckeberg medial sclerosis

Answer

Churg-Strauss disease

Answer

Complicated atherosclerotic plaque

Answer

Fibromuscular dysplasia

Question 8

Epithelioid hemangioendothelioma of the nose is classified as which of the following?

Accepted Answer

Sarcoma

Answer

Carcinoma

Answer

Carcinosarcoma

Answer

Hamartoma

Question 9

Which of the following conditions does NOT present with granulomatous vasculitis?

Accepted Answer

Microscopic polyangiitis

Answer

Polyarteritis nodosa

Answer

Wegener's granulomatosis

Answer

Churg-Strauss syndrome

Question 10

ANCA is found in all except?

Accepted Answer

Bacterial Vasculitis

Answer

Wegener's granulomatosis

Answer

Churg-Strauss syndrome

Answer

Microscopic Polyangiitis

Vascular Pathology — MCQs

Vascular Pathology — MCQs

On this page

Practice by Chapter

Want unlimited practice?