Vascular Pathology Practice Questions

Q: Leutic aneurysms are common in all of the following locations EXCEPT?

Abdominal aorta. **Explanation:** **Leutic aneurysms** (syphilitic aneurysms) are a complication of tertiary syphilis. The underlying pathophysiology involves **obliterative endarteritis** of the **vasa vasorum** [1]. This leads to ischemic injury of the tunica media (mesoatortitis), resulting in the loss of elastic tissue and subsequent aneurysmal dilatation [1]. **Why the Abdominal Aorta is the Correct Answer:** The distribution of leutic aneurysms is directly proportional to the density of the vasa vasorum. The **ascending aorta and arch of the aorta** have the highest concentration of vasa vasorum, making them the most common sites. As we move distally, the density of these vessels decreases significantly. The **abdominal aorta** has the fewest vasa vasora; therefore, it is rarely involved in syphilis. Instead, the abdominal aorta is the most common site for **atherosclerotic aneurysms**. **Analysis of Incorrect Options:** * **A & B (Ascending Aorta & Arch):** These are the most frequent sites (approx. 80%) for syphilitic involvement due to the rich vascular supply to the media [1]. * **C (Descending Thoracic Aorta):** While less common than the arch, it is still a recognized site for leutic aneurysms as it contains more vasa vasorum than the abdominal segment. **High-Yield Clinical Pearls for NEET-PG:** * **Gross Appearance:** The damaged intima heals with scarring, leading to a characteristic **"Tree-bark appearance."** * **Complication:** Dilation of the ascending aorta often stretches the aortic valve ring, leading to **Aortic Regurgitation** and "Cor Bovinum" (massive heart). * **Microscopy:** Plasma cell-rich infiltrate around the vasa vasorum [1]. * **Key Distinction:** Syphilis = Thoracic Aorta; Atherosclerosis = Abdominal Aorta. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Infectious Diseases, pp. 388-389.

Q: Kasabach-Merritt syndrome is associated with which of the following?

Giant hemangioma. **Explanation:** **Kasabach-Merritt Syndrome (KMS)**, also known as Hemangioma-thrombocytopenia syndrome, is a life-threatening condition characterized by the association of a rapidly growing vascular tumor with **consumptive coagulopathy**. **Why Option A is correct:** The underlying pathology involves a **giant hemangioma** (most commonly a *tufted angioma* or *kaposiform hemangioendothelioma*). The complex, irregular architecture of the vascular channels within these large tumors causes blood stasis and platelet activation. This leads to massive **platelet sequestration** and consumption of clotting factors within the lesion, resulting in severe thrombocytopenia, microangiopathic hemolytic anemia, and disseminated intravascular coagulation (DIC). **Why the other options are incorrect:** * **Option B:** Large aortic aneurysms are associated with stasis and mural thrombi, but they do not typically cause the profound consumptive thrombocytopenia seen in KMS. * **Option C:** Giant thrombocytes (platelets) are characteristic of Bernard-Soulier Syndrome, a qualitative platelet disorder, not a vascular entrapment syndrome. * **Option D:** While Arteriovenous malformations (AVMs) involve abnormal vessels, they generally lack the specific proliferative endothelium required to trap and destroy platelets in the manner diagnostic of KMS. **High-Yield Clinical Pearls for NEET-PG:** * **Classic Triad:** Giant vascular tumor + Thrombocytopenia + Consumptive coagulopathy. * **Common Sites:** Skin and soft tissues (most common), but can involve the liver or spleen. * **Laboratory Findings:** Low platelet count, decreased fibrinogen, and elevated D-dimers (indicative of DIC). * **Management:** Often requires systemic corticosteroids, vincristine, or sirolimus; surgery is rarely feasible due to the risk of massive hemorrhage.

Question 1

Leutic aneurysms are common in all of the following locations EXCEPT?

Accepted Answer

Abdominal aorta

Answer

Ascending aorta

Answer

Arch of aorta

Answer

Descending thoracic aorta

Question 2

Takayasu arteritis mainly affects which artery?

Accepted Answer

Subclavian artery

Answer

Dorsalis pedis artery

Answer

Celiac artery

Answer

Superior mesenteric artery

Question 3

What is the most common site of venous thrombosis?

Accepted Answer

Veins of the lower extremity

Answer

Veins of the upper extremity

Answer

Dural sinus

Answer

Popliteal vein

Question 4

Cystic medial necrosis responsible for aortic dilatation and rupture is seen in which condition?

Accepted Answer

Marfan syndrome

Answer

Syphilitic aneurysm

Answer

Takayasu arteritis

Answer

Atherosclerosis

Question 5

Which vasculitis affects both the arterial and venous systems?

Accepted Answer

Wegener granulomatosis

Answer

Polyarteritis nodosa

Answer

Behcet's disease

Answer

Kawasaki disease

Question 6

A muscle biopsy in Polyarteritis Nodosa (PAN) shows which of the following findings?

Accepted Answer

Necrotizing arteritis

Answer

Atrophy

Answer

Granulomatous lesions

Answer

Ring lesions

Question 7

An experiment studies early atheroma development. Lipid streaks on arterial walls are examined microscopically and biochemically to determine their cellular and chemical constituents and the factors promoting their formation. Early lesions show increased attachment of monocytes to the endothelium. The monocytes migrate subendothelially and become macrophages; these macrophages transform themselves into foam cells. Which of the following substances is most likely to be responsible for the transformation of macrophages into foam cells?

Accepted Answer

Oxidized LDL

Answer

C-reactive protein

Answer

Homocysteine

Answer

Lp(a)

Question 8

A cleft-like space within an atheromatous plaque typically contains which of the following?

Accepted Answer

Cholesterol crystals

Answer

Smooth muscle cells

Answer

Fibrous tissue

Answer

None of these

Question 9

Which of the following conditions is associated with Hepatitis B?

Accepted Answer

Polyarteritis nodosa

Answer

Wegener's granulomatosis

Answer

Systemic lupus erythematosus

Answer

Sjogren syndrome

Question 10

Kasabach-Merritt syndrome is associated with which of the following?

Accepted Answer

Giant hemangioma

Answer

Large aneurysm of the aorta

Answer

Giant thrombocytes

Answer

Arteriovenous malformation

Vascular Pathology — MCQs

Vascular Pathology — MCQs

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