Vascular Surgery — MCQs

Vascular Surgery Indian Medical PG Practice Questions and MCQs

Question 381: Which of the following is NOT a clinical presentation of Peripheral arterial occlusion?

A. Pain
B. Pallor
C. Anesthesia
D. None of the above (Correct Answer)

Explanation: The clinical presentation of acute peripheral arterial occlusion is classically described by the **"6 Ps" mnemonic**. This condition is a surgical emergency resulting from a sudden decrease in limb perfusion, most commonly due to an embolism or thrombosis. **Explanation of the Correct Answer:** The correct answer is **D (None of the above)** because all the listed options (Pain, Pallor, and Anesthesia) are hallmark clinical features of acute limb ischemia. Since the question asks which is *NOT* a presentation, and all listed are indeed presentations, "None of the above" is the only logical choice. **Analysis of Options:** * **Pain (Option A):** Usually the earliest and most common symptom. It is typically sudden, severe, and located distal to the site of occlusion. * **Pallor (Option B):** Due to the lack of arterial blood flow, the affected limb appears pale or "waxy" white. As ischemia progresses, it may turn mottled or cyanotic. * **Anesthesia/Paresthesia (Option C):** Nerve fibers are highly sensitive to hypoxia. Loss of sensation (anesthesia) or "pins and needles" (paresthesia) indicates significant ischemic compromise and is a warning sign of impending limb loss. **High-Yield Clinical Pearls for NEET-PG:** * **The 6 Ps:** Pain, Pallor, Pulselessness, Paresthesia, Paralysis, and Poikilothermia (perishing cold). * **Prognostic Sign:** **Paralysis and Anesthesia** are the most ominous signs, suggesting irreversible muscle and nerve damage (Rutherford Class III). * **Gold Standard Investigation:** Digital Subtraction Angiography (DSA). * **Immediate Management:** Start IV Unfractionated Heparin to prevent clot propagation while awaiting definitive intervention (Embolectomy or Thrombolysis).

Question 382: In an extraperitoneal approach for left sympathectomy, which of the following structures may be injured?

A. Ureter
B. Gonadal vessels
C. Ureter and Gonadal vessels (Correct Answer)
D. Inferior Vena Cava (IVC)

Explanation: **Explanation:** Lumbar sympathectomy is commonly performed via an **extraperitoneal approach** (retroperitoneal) to treat peripheral vascular disease or hyperhidrosis. To access the sympathetic chain, which lies on the anterolateral aspect of the lumbar vertebral bodies, the surgeon must retract the peritoneum and its contents medially. **Why Option C is Correct:** The **ureter** and the **gonadal vessels** (testicular or ovarian) are both retroperitoneal structures that are anatomically adherent to the posterior layer of the peritoneum. During the medial displacement of the peritoneal sac to expose the psoas muscle and the sympathetic chain, these structures are lifted and retracted along with the peritoneum. Consequently, they lie directly in the surgical field and are at high risk of accidental traction or transection injuries. **Analysis of Incorrect Options:** * **Option A & B:** While both are at risk, selecting only one is incomplete. Both structures travel in close proximity in the retroperitoneum and are equally vulnerable during the dissection. * **Option D (IVC):** The Inferior Vena Cava is located on the **right side** of the vertebral column. In a **left-sided** sympathectomy, the IVC is not encountered; instead, the **Aorta** would be the major vessel medial to the sympathetic chain. **High-Yield Clinical Pearls for NEET-PG:** * **Anatomical Landmark:** The lumbar sympathetic chain lies in the groove between the **Psoas major muscle** and the **vertebral bodies**. * **Right vs. Left:** On the right, the chain is covered by the **IVC**; on the left, it is lateral to the **Aorta**. * **Identification:** The sympathetic chain is identified by its distinct ganglia (usually L2-L4 are targeted) and its "firm, cord-like" feel compared to the genitofemoral nerve. * **Complication:** The most common side effect of bilateral lumbar sympathectomy in males is **retrograde ejaculation** (due to involvement of L1).

Question 383: Following graft repair of a thoraco-abdominal aneurysm, a patient develops lower limb weakness. What is the most probable cause for this complication?

A. Decreased blood supply to the lower limbs
B. Thoracosplanchnic injury
C. Disruption of the artery of Adamkiewicz (great anterior radicular artery) (Correct Answer)
D. Lumbosacral nerve injury

Explanation: ### Explanation **Correct Option: C. Disruption of the artery of Adamkiewicz** The most dreaded complication of thoraco-abdominal aortic aneurysm (TAAA) repair is **spinal cord ischemia**, leading to paraplegia or lower limb weakness. The spinal cord receives its primary blood supply in the lower thoracic and lumbar regions from the **Artery of Adamkiewicz** (Great Anterior Radicular Artery). This artery typically arises from a left-sided intercostal or lumbar artery between **T8 and L1**. During graft repair, this vessel may be ligated, excluded, or suffer from perioperative hypotension, leading to infarction of the anterior two-thirds of the spinal cord (Anterior Spinal Artery Syndrome). **Why other options are incorrect:** * **A. Decreased blood supply to the lower limbs:** While acute limb ischemia can cause weakness, it presents with the "6 Ps" (Pain, Pallor, Pulselessness, etc.). In the context of TAAA repair, central neurological deficit (spinal cord) is a more specific and common cause of bilateral weakness. * **B. Thoracosplanchnic injury:** These nerves provide sympathetic innervation to the abdomen. Injury would result in paralytic ileus or visceral dysfunction, not motor weakness of the limbs. * **D. Lumbosacral nerve injury:** This would typically cause focal or peripheral nerve deficits. Bilateral weakness following aortic cross-clamping is classically central (spinal cord) rather than peripheral. **High-Yield Clinical Pearls for NEET-PG:** * **Crawford Classification:** Used to categorize TAAA; Type II (involving the whole descending thoracic and abdominal aorta) carries the highest risk of spinal cord ischemia. * **Prevention Strategies:** To prevent this complication, surgeons use **distal aortic perfusion**, **reimplantation of intercostal arteries**, and **cerebrospinal fluid (CSF) drainage** to improve spinal cord perfusion pressure. * **Artery of Adamkiewicz origin:** Most commonly arises from the left side between T9 and T12.

Question 384: What is the most common site of lymph node enlargement in Hodgkin's lymphoma?

A. Cervical
B. Axillary
C. Mediastinal (Correct Answer)
D. Abdominal

Explanation: **Explanation:** In **Hodgkin’s Lymphoma (HL)**, the disease typically originates in a single node or chain of nodes and spreads predictably to anatomically contiguous groups. **Why Mediastinal is the Correct Answer:** While cervical lymphadenopathy is the most common *palpable* presentation (found in 60-80% of patients during physical examination), **mediastinal involvement** is the most common site of lymph node enlargement overall when considering both clinical and radiological findings. Approximately **60% to 80% of patients** with the Nodular Sclerosis subtype (the most common variant) present with a mediastinal mass. In modern clinical practice and imaging-based staging, the mediastinum is recognized as the most frequently involved site. **Analysis of Incorrect Options:** * **A. Cervical:** This is the most common site for *peripheral* or *palpable* lymphadenopathy. If the question specifically asks for the most common "palpable" site, cervical is the answer. However, in a general context, mediastinal involvement is more frequent. * **B. Axillary:** Involved in about 10-20% of cases; it is rarely the primary or most common site. * **C. Abdominal:** Para-aortic and splenic involvement occur but are less common than supradiaphragmatic sites (Cervical/Mediastinal). Abdominal involvement is more characteristic of Non-Hodgkin Lymphoma (NHL). **High-Yield Clinical Pearls for NEET-PG:** * **Bimodal Age Distribution:** HL peaks in the 20s and again after age 50. * **Reed-Sternberg (RS) Cells:** The diagnostic hallmark (classic "Owl’s eye" appearance). * **Nodular Sclerosis:** The most common histological subtype; frequently presents with a large mediastinal mass in young females. * **Spread:** HL spreads in a **contiguous** fashion (node to adjacent node), unlike NHL which is often disseminated. * **Alcohol-induced pain:** A rare but classic symptom where lymph nodes become painful after alcohol consumption.

Question 385: What are the presenting symptoms of immunoproliferative small intestinal lymphoma?

A. Chronic diarrhea (Correct Answer)
B. Obstruction
C. Peritonitis
D. Tenesmus

Explanation: **Explanation:** **Immunoproliferative Small Intestinal Disease (IPSID)**, also known as Mediterranean lymphoma or Seligmann’s disease, is a variant of MALT lymphoma associated with *Campylobacter jejuni* infection. It is characterized by the production of truncated alpha heavy chains (Alpha heavy chain disease). 1. **Why Chronic Diarrhea is correct:** The primary pathology involves diffuse infiltration of the small intestinal mucosa (mainly duodenum and jejunum) by plasma cells. This leads to a severe **malabsorption syndrome**. Consequently, the most common presenting symptoms are **chronic diarrhea**, steatorrhea, weight loss, and abdominal pain. Clubbing is also a frequently associated clinical sign. 2. **Why incorrect options are wrong:** * **Obstruction:** While IPSID can cause bowel wall thickening, it typically presents as a diffuse mucosal process rather than a discrete, obstructing mass (unlike Western-type sporadic lymphoma). * **Peritonitis:** This is a sign of perforation. While lymphoma can perforate (especially after starting chemotherapy), it is a late complication and not the typical presenting symptom. * **Tenesmus:** This refers to the feeling of incomplete defecation, usually associated with rectal pathology (e.g., rectal cancer or ulcerative colitis). IPSID primarily affects the proximal small intestine. **High-Yield Pearls for NEET-PG:** * **Marker:** Presence of **Alpha heavy chains** in serum or intestinal secretions. * **Epidemiology:** Most common in young adults from lower socioeconomic backgrounds (Middle East/Mediterranean). * **Treatment:** Early-stage disease often responds to **Antibiotics** (Tetracycline/Metronidazole); advanced stages require CHOP chemotherapy. * **Radiology:** Barium studies may show "cobblestone" appearance or thickened mucosal folds.

Question 386: A 30-year-old chronic smoker male presents with a condition requiring diagnosis. What is the most likely diagnosis?

A. Diabetic gangrene
B. Buerger's disease (Correct Answer)
C. Atherosclerotic plaque
D. Clostridium welchii infection

Explanation: ***Buerger's disease*** - **Thromboangiitis obliterans** is strongly associated with chronic smoking in **young males (age 20-40)**, making it the most likely diagnosis. - Classic angiographic finding shows **corkscrew collaterals** and segmental occlusion of small and medium arteries with **inflammation**. *Diabetic gangrene* - Typically occurs in **elderly diabetic patients** with poor glycemic control and peripheral neuropathy. - Associated with **large vessel atherosclerosis** and diabetic complications, not primarily linked to smoking in young adults. *Atherosclerotic plaque* - Usually affects **older patients (>50 years)** with multiple cardiovascular risk factors like hypertension and hyperlipidemia. - Involves **large and medium-sized arteries** with calcified plaques, not the inflammatory small vessel disease seen in young smokers. *Clostridium welchii infection* - **Gas gangrene** presents with rapid onset of severe pain, **crepitus**, and systemic toxicity following trauma or surgery. - Characterized by **muscle necrosis** and gas formation in tissues, unrelated to chronic smoking history.

Question 387: Which of the following is not a complication of surgery for thoracic outlet syndrome?

A. Pneumothorax
B. Brachial plexus injury
C. Lymphocutaneous fistula (Correct Answer)
D. Long thoracic nerve injury

Explanation: **Explanation:** Thoracic Outlet Syndrome (TOS) surgery typically involves **first rib resection** and/or **scalenectomy** via transaxillary or supraclavicular approaches. Understanding the regional anatomy is key to identifying potential complications. **Why Lymphocutaneous fistula is the correct answer:** While the **thoracic duct** (on the left) or the **right lymphatic duct** can be injured during supraclavicular dissection, this typically results in a **Chylothorax** (if it leaks into the pleura) or a **Chylous fistula**. A "lymphocutaneous fistula" (leakage of clear lymph through the skin) is not a recognized or standard complication of TOS surgery. **Analysis of incorrect options:** * **Pneumothorax:** This is the **most common complication** of TOS surgery. The apical pleura lies immediately adjacent to the first rib; accidental entry into the pleural space during rib resection is frequent. * **Brachial Plexus Injury:** The roots and trunks of the brachial plexus pass through the scalene triangle directly over the first rib. Excessive traction or direct trauma during surgery can lead to temporary neuropraxia or permanent palsy. * **Long Thoracic Nerve Injury:** This nerve (C5-C7) can be injured during the transaxillary approach as it courses along the chest wall. Injury leads to **winging of the scapula**. **High-Yield Clinical Pearls for NEET-PG:** * **Most common nerve injured:** Lower trunk of the brachial plexus (C8-T1) or the Intercostobrachial nerve (causing numbness in the inner arm). * **Vascular structures at risk:** Subclavian artery and vein. * **Adson’s Test:** A classic clinical test for TOS where the radial pulse disappears upon neck extension and rotation to the affected side. * **Paget-Schroetter Syndrome:** Effort-induced thrombosis of the subclavian vein, often requiring first rib resection.

Question 388: Which of the following statements is true regarding a descending aortic dissection?

A. It originates distal to the subclavian artery.
B. It is usually found in hypertensive patients.
C. It may extend the entire length of the aorta.
D. All of the above. (Correct Answer)

Explanation: **Explanation:** A descending aortic dissection corresponds to **Stanford Type B** or **DeBakey Type III** classification. The correct answer is **D (All of the above)** because each statement accurately describes the pathophysiology and clinical presentation of this condition. 1. **Origin (Option A):** By definition, a descending aortic dissection (Stanford Type B) originates distal to the takeoff of the **left subclavian artery**. This distinguishes it from Type A dissections, which involve the ascending aorta. 2. **Etiology (Option B):** Chronic **hypertension** is the single most important risk factor for descending aortic dissections. The constant hemodynamic stress leads to intimal tearing, especially in older patients with atherosclerotic changes. 3. **Extent (Option C):** Once an intimal tear occurs, the blood creates a "false lumen." This dissection plane can propagate distally, often extending through the entire length of the thoracic and abdominal aorta, potentially involving the iliac arteries. **Clinical Pearls for NEET-PG:** * **Classification Systems:** * **Stanford:** Type A (Ascending aorta involved); Type B (Descending only). * **DeBakey:** Type I (Ascending + Descending); Type II (Ascending only); Type III (Descending only). * **Management:** Unlike Type A (which is a surgical emergency), uncomplicated Type B dissections are primarily managed **medically** with aggressive blood pressure and heart rate control (IV Beta-blockers like Esmolol or Labetalol are first-line). * **Gold Standard Investigation:** CT Angiography (CTA) is the investigation of choice for diagnosis and mapping the extent of the dissection. * **Classic Presentation:** Sudden onset "tearing" or "ripping" interscapular back pain.

Question 389: Which of the following best describes Buerger's disease?

A. Non-progressive
B. Segmental (Correct Answer)
C. Non-inflammatory
D. Atherosclerotic

Explanation: **Explanation:** **Buerger’s Disease**, also known as **Thromboangiitis Obliterans (TAO)**, is a non-atherosclerotic, inflammatory occlusive disease that primarily affects small and medium-sized arteries and veins of the distal upper and lower extremities. 1. **Why "Segmental" is correct:** The hallmark of Buerger’s disease is its **segmental distribution**. This means that diseased sections of the vessel are separated by segments of entirely normal, healthy vessels (skip lesions). This is a crucial diagnostic feature seen on angiography, often described as a "corkscrew" appearance due to collateral formation around the segmental occlusions. 2. **Why the other options are incorrect:** * **Non-progressive:** TAO is a **progressive** disease, especially if the patient continues to use tobacco. It can lead to critical limb ischemia, ulceration, and gangrene. * **Non-inflammatory:** TAO is fundamentally an **inflammatory** condition. Unlike atherosclerosis, it involves a highly cellular, inflammatory thrombus with relative sparing of the vessel wall (internal elastic lamina remains intact). * **Atherosclerotic:** TAO is a **non-atherosclerotic** vasculitis. It lacks the lipid deposition and calcification characteristic of atherosclerosis and typically affects much younger patients. **High-Yield Clinical Pearls for NEET-PG:** * **Strongest Risk Factor:** Heavy tobacco use (smoking or chewing). Cessation is the only way to halt disease progression. * **Demographics:** Typically affects young males (<45 years). * **Triad:** Distal ischemia (claudication/rest pain), Raynaud’s phenomenon, and Migratory Superficial Thrombophlebitis. * **Angiographic finding:** "Corkscrew" collaterals (Martorell’s sign). * **Histopathology:** Microabscesses within the thrombus (Langerhans giant cells).

Question 390: What is the most common cause of a thrombus in the common femoral artery in a 40-year-old male?

A. Atheroma (Correct Answer)
B. Thromboangiitis obliterans
C. Raynaud's disease
D. Abdominal mass

Explanation: **Explanation:** **1. Why Atheroma is Correct:** Atherosclerosis (Atheroma) is the most common cause of arterial thrombosis and chronic limb-threatening ischemia worldwide. In the lower limbs, the **common femoral artery** and the **superficial femoral artery (at Adductor canal)** are the most frequent sites for atherosclerotic plaque formation. Even in a 40-year-old male, lifestyle factors, genetics, and metabolic syndromes make atheroma the leading cause of large-vessel occlusion. The thrombus typically forms due to plaque rupture or endothelial erosion, which triggers the coagulation cascade. **2. Why Other Options are Incorrect:** * **Thromboangiitis obliterans (Buerger’s Disease):** While common in young male smokers, it primarily affects **small and medium-sized distal arteries** (e.g., tibial and radial arteries). It rarely involves the proximal common femoral artery. * **Raynaud’s Disease:** This is a functional vasospastic disorder affecting the digital arteries of the fingers and toes. It does not lead to large-vessel thrombus in the femoral artery. * **Abdominal Mass:** While a large mass (like an aneurysm or tumor) can cause extrinsic compression leading to stasis, it is a rare cause of femoral thrombosis compared to the systemic prevalence of atherosclerosis. **3. High-Yield Clinical Pearls for NEET-PG:** * **Most common site of peripheral arterial occlusion:** Superficial Femoral Artery (SFA). * **Most common site for an arterial embolus:** Femoral artery bifurcation (Common Femoral Artery). * **Leriche Syndrome:** A triad of claudication (buttock/thigh), impotence, and absent femoral pulses due to aortoiliac occlusive disease. * **Buerger’s Disease Hallmark:** Segmental inflammation with "corkscrew collaterals" on angiography.

Practice by Chapter

Atherosclerotic Disease

Practice Questions

Aortic Aneurysms

Practice Questions

Peripheral Arterial Disease

Practice Questions

Carotid Artery Disease

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Venous Thromboembolism

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Chronic Venous Insufficiency

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Mesenteric Vascular Disease

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Vascular Trauma

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Vascular Access for Hemodialysis

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Endovascular Techniques

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Diabetic Foot Vascular Disease

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Vasculitis

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