Vascular Pathology — MCQs

Vascular Pathology Indian Medical PG Practice Questions and MCQs

Question 151: In atherosclerosis, what leads to increased LDL in monocyte macrophages?

A. Presence of LDL receptors on macrophages
B. Presence of LDL receptors on the endothelium
C. Oxidation of lipids within LDL particles (Correct Answer)
D. All of the above

Explanation: ### Explanation The development of an atherosclerotic plaque begins with the accumulation of **Low-Density Lipoprotein (LDL)** in the arterial intima [1]. However, native LDL is not readily taken up by macrophages in large enough quantities to form foam cells. **1. Why Option C is Correct:** The critical step is the **oxidation of LDL** by reactive oxygen species (ROS) produced by endothelial cells or macrophages [1]. Oxidized LDL (ox-LDL) is recognized by **Scavenger Receptors (SR-A and CD36)** on macrophages. Unlike the tightly regulated native LDL receptor, scavenger receptors are **not downregulated** by high intracellular cholesterol levels [2]. This allows macrophages to ingest unlimited amounts of oxidized lipids, transforming them into lipid-laden **foam cells**, the hallmark of the fatty streak. **2. Why Other Options are Incorrect:** * **Option A:** While macrophages do have native LDL receptors, these are regulated by a negative feedback loop [2]. Once the cell has enough cholesterol, the receptors are internalized, preventing the massive accumulation required for atherosclerosis. * **Option B:** LDL receptors on the endothelium facilitate the transport of LDL into the subendothelial space, but they do not explain the specific accumulation within macrophages. * **Option D:** Since the mechanism specifically requires the modification (oxidation) of LDL to bypass cellular regulatory systems, "All of the above" is incorrect. **High-Yield NEET-PG Pearls:** * **Key Receptors:** Scavenger Receptor A (SR-A) and CD36 are the primary mediators of foam cell formation. * **Fatty Streaks:** These are the earliest visible lesions of atherosclerosis and can be seen in the aortas of children as young as 1 year old. * **Location:** Atherosclerosis most commonly affects the **Abdominal Aorta** (most common site), followed by Coronary arteries, Popliteal arteries, and Internal Carotids. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 502-504. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Genetic Disorders, pp. 156-157.

Question 152: Which of the following is NOT true about Berry aneurysms?

A. Rupture leading to subarachnoid hemorrhage
B. Most common in the posterior circulation (Correct Answer)
C. A developmental anomaly
D. Common in the anterior circulation

Explanation: **Explanation:** **Berry (Saccular) aneurysms** are the most common cause of non-traumatic subarachnoid hemorrhage [1]. The correct answer is **Option B** because it is a false statement: Berry aneurysms are significantly more common in the **anterior circulation (approx. 90%)** than the posterior circulation [2]. 1. **Why Option B is the correct answer (False statement):** The most frequent site for Berry aneurysms is the **Anterior Communicating Artery (ACoA)** junction (30-35%), followed by the Internal Carotid Artery and Middle Cerebral Artery. Only about 10% occur in the posterior circulation (e.g., Basilar artery tip) [2]. 2. **Why Option A is true:** Rupture of these aneurysms releases blood directly into the subarachnoid space, leading to a classic "thunderclap headache" (worst headache of life) [1]. 3. **Why Option C is true:** They are considered developmental anomalies caused by a **congenital deficiency of the tunica media** (muscle layer) at arterial bifurcations. They are not present at birth but develop over time due to hemodynamic stress. 4. **Why Option D is true:** As stated above, the vast majority (90%) occur in the anterior part of the Circle of Willis [2]. **High-Yield Clinical Pearls for NEET-PG:** * **Associated Conditions:** Autosomal Dominant Polycystic Kidney Disease (ADPKD), Ehlers-Danlos Syndrome, and Coarctation of the aorta [1]. * **Risk Factors:** Hypertension and smoking significantly increase the risk of rupture [1]. * **Morphology:** They are thin-walled outpocketings lacking a media and internal elastic lamina [2]. * **Diagnosis:** CT scan is the initial investigation; Digital Subtraction Angiography (DSA) is the gold standard. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Manifestations Of Central And Peripheral Nervous System Disease, pp. 705-706. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Central Nervous System, p. 1272.

Question 153: A 75-year-old woman presents with facial pain, headache, and intermittent visual symptoms. Temporal artery biopsies are performed. If the biopsies show abnormal vessels, which of the following would be the most likely pathological finding?

A. Atherosclerotic plaque
B. Fibrinoid necrosis
C. Focal granulomatous inflammation (Correct Answer)
D. Fungal hyphae

Explanation: ### Explanation **Correct Answer: C. Focal granulomatous inflammation** The clinical presentation of a 75-year-old woman with facial pain (jaw claudication), headache, and visual symptoms is classic for **Giant Cell (Temporal) Arteritis (GCA)** [1][2]. GCA is the most common systemic vasculitis in adults over age 50. The hallmark pathological finding in GCA is **granulomatous inflammation** of the media, characterized by an infiltrate of lymphocytes, macrophages, and multinucleated giant cells [1][2]. A critical diagnostic feature is that the inflammation is **focal (segmental)**, meaning it does not involve the entire length of the vessel [1]. This leads to "skip lesions," which is why a long segment of the temporal artery must be biopsied to avoid a false-negative result. **Analysis of Incorrect Options:** * **A. Atherosclerotic plaque:** While common in the elderly, atherosclerosis typically affects large elastic and medium-sized muscular arteries (like coronaries) and is characterized by intimal lipid accumulation, not primary granulomatous inflammation of the media. * **B. Fibridoid necrosis:** This is the characteristic finding in **Polyarteritis Nodosa (PAN)** or small-vessel vasculitides (like GPA). GCA is a large-vessel vasculitis and rarely shows fibrinoid necrosis [3]. * **D. Fungal hyphae:** While angioinvasive fungi (like *Mucor*) can cause vessel destruction, they typically present in immunocompromised patients with acute, necrotic facial lesions, not the chronic, systemic symptoms of GCA. **High-Yield Clinical Pearls for NEET-PG:** * **Demographics:** Almost exclusively occurs in patients >50 years; strongly associated with **Polymyalgia Rheumatica (PMR)** [1][2]. * **Lab Marker:** Markedly elevated **ESR** (often >100 mm/hr) and CRP [2]. * **Complication:** The most feared complication is **permanent blindness** due to ophthalmic artery involvement [3]. * **Treatment:** Immediate high-dose **corticosteroids** should be started even before biopsy results are available if clinical suspicion is high. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 516-517. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Osteoarticular And Connective Tissue Disease, pp. 686-687. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Osteoarticular And Connective Tissue Disease, pp. 688-689.

Question 154: What type of arteritis may lead to myocardial infarction in children?

A. Kawasaki disease (Correct Answer)
B. Takayasu arteritis
C. Polyarteritis nodosa
D. Microscopic polyangitis

Explanation: **Explanation:** **Kawasaki Disease (Mucocutaneous Lymph Node Syndrome)** is the correct answer because it is a medium-vessel vasculitis that specifically targets the **coronary arteries** in infants and young children (typically <5 years old). The underlying pathology involves transmural inflammation leading to weakening of the arterial wall, which results in **coronary artery aneurysms**. These aneurysms can undergo thrombosis or rupture, leading to acute myocardial infarction (MI)—the leading cause of acquired heart disease in children in developed nations. **Analysis of Incorrect Options:** * **Takayasu Arteritis:** Known as "pulseless disease," it is a large-vessel vasculitis affecting the aorta and its main branches [3]. It typically presents in young females (not children) with diminished peripheral pulses. * **Polyarteritis Nodosa (PAN):** A medium-vessel vasculitis associated with Hepatitis B [1]. While it causes "string of pearls" aneurysms in renal and visceral vessels, it characteristically **spares the pulmonary and coronary arteries** in the pediatric population. * **Microscopic Polyangiitis:** A small-vessel vasculitis (p-ANCA positive) that primarily affects the kidneys (glomerulonephritis) and lungs (hemoptysis) [2], rather than causing coronary aneurysms. **High-Yield Clinical Pearls for NEET-PG:** * **Clinical Diagnosis (CRASH and Burn):** **C**onjunctivitis (non-purulent), **R**ash (polymorphous), **A**denopathy (cervical), **S**trawberry tongue (oral mucositis), **H**ands/Feet (edema/desquamation), and **Burn** (high fever >5 days). * **Treatment:** High-dose Aspirin and IVIG (Intravenous Immunoglobulin) are used to prevent coronary aneurysm formation. * **Pathology:** Healed lesions may show obstructive intimal thickening, further increasing MI risk. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 517-518. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 518-519. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 516-517.

Question 155: Syphilitic aneurysm most commonly involves which part of the aorta?

A. Ascending aorta
B. Descending aorta
C. Abdominal aorta above the renal arteries
D. None of the above (Correct Answer)

Explanation: **Explanation:** The correct answer is **None of the above** because the question asks for the most common site, and while syphilis affects the thoracic aorta, it specifically targets the **arch of the aorta** most frequently, followed by the ascending aorta. **1. Underlying Medical Concept:** Syphilitic (luetic) aneurysm is a complication of tertiary syphilis. The pathophysiology involves **obliterative endarteritis** of the **vasa vasorum** [1]. This leads to ischemic injury of the aortic media (mesoaortitis), resulting in the destruction of elastic tissue and smooth muscle. The weakened wall undergoes aneurysmal dilation. Because the vasa vasorum are most abundant in the thoracic aorta, this is the primary site of involvement [1]. **2. Analysis of Options:** * **Ascending Aorta (A):** While frequently involved and a classic site for syphilitic aortitis leading to aortic regurgitation, the **arch** is statistically the most common site for the actual aneurysm formation. * **Descending Aorta (B):** This is less commonly involved compared to the proximal thoracic segments. * **Abdominal Aorta (C):** This is the most common site for **Atherosclerotic aneurysms**, not syphilitic ones. Syphilis rarely involves the aorta below the diaphragm because the abdominal aorta has fewer vasa vasorum. **3. NEET-PG High-Yield Pearls:** * **Gross Appearance:** "Tree-bark" appearance of the intima due to patchy subintimal fibrosis. * **Key Complication:** Aortic root dilation leading to **Aortic Regurgitation** (proximal involvement). * **Microscopy:** Plasma cell-rich infiltrate around the vasa vasorum [1]. * **Comparison:** Atherosclerotic aneurysms are typically **Abdominal (infra-renal)**; Syphilitic aneurysms are typically **Thoracic (Arch > Ascending)**. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Infectious Diseases, pp. 388-389.

Question 156: A mycotic aneurysm is an aneurysm infected because of-

A. Fungal infection
B. Blood-borne infection (intravascular)
C. Infection introduced from outside (extravascular)
D. Both intravascular and extravascular infection (Correct Answer)

Explanation: **Explanation:** A **mycotic aneurysm** refers to an aneurysm caused by an infection that weakens the arterial wall [1]. Despite the name (coined by William Osler due to the "mushroom-like" appearance of the vegetations), it is most commonly caused by **bacteria** (e.g., *Staphylococcus, Streptococcus, Salmonella*) rather than fungi [2]. The infection can reach the vessel wall through two primary routes, making **Option D** the correct answer: 1. **Intravascular (Blood-borne):** This is the most common mechanism. It typically occurs via **septic embolization** (e.g., from Infective Endocarditis) where infected material lodges in the *vasa vasorum* or the vessel lumen, or via direct seeding during bacteremia [1], [2]. 2. **Extravascular (Outside-in):** The infection spreads to the artery from an **adjacent focus**, such as a nearby abscess, cellulitis, or tuberculous lymphadenitis (common in the aorta) [1]. It can also occur through direct inoculation via trauma or non-sterile medical procedures (e.g., IV drug use). **Analysis of Incorrect Options:** * **Option A:** While "mycotic" implies fungal, fungi are a rare cause. The term is a historical misnomer [2]. * **Options B & C:** These are incomplete. Both routes are recognized pathways for the pathogenesis of mycotic aneurysms. **NEET-PG High-Yield Pearls:** * **Most common site:** The **Aorta** (specifically the abdominal aorta) is the most common site, followed by the femoral and cerebral arteries. * **Most common cause:** *Staphylococcus aureus* and *Salmonella* are frequently implicated. * **Morphology:** These are typically **false aneurysms** (pseudoaneurysms) because the infection destroys the vessel wall layers. * **Complication:** They carry a high risk of sudden rupture and catastrophic hemorrhage. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 510-511. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 146-147.

Question 157: Which of the following does not cause deep vein thrombosis?

A. Estrogen
B. Thrombocytosis
C. Paroxysmal nocturnal hemoglobinuria
D. Sickle cell anemia (Correct Answer)

Explanation: The correct answer is **Sickle cell anemia**. ### **Explanation** The pathogenesis of Deep Vein Thrombosis (DVT) is governed by **Virchow’s Triad**: Endothelial injury, Stasis, and Hypercoagulability [1]. **Why Sickle Cell Anemia (SCA) is the correct answer:** While SCA is a prothrombotic state, its primary vascular complication is **Vaso-occlusive Crisis (VOC)** occurring in the **microvasculature** (capillaries and venules) due to the polymerization of HbS and sickling of RBCs [2]. While patients with SCA have an increased risk of venous thromboembolism (VTE) generally, in the context of standard NEET-PG pathology, SCA is classically associated with **arterial-side complications** (infarcts of the spleen, bone, and brain) [2] and microvascular occlusion rather than being a primary cause of classic DVT when compared to the other high-risk hypercoagulable states listed. ### **Analysis of Incorrect Options:** * **A. Estrogen:** Combined oral contraceptives or HRT increase the synthesis of clotting factors (II, VII, IX, X) and decrease Antithrombin III, creating a systemic hypercoagulable state directly linked to DVT [3]. * **B. Thrombocytosis:** An absolute increase in platelet count (e.g., in Essential Thrombocythemia or Polycythemia Vera) increases blood viscosity and platelet aggregation [4], leading to both arterial and venous thrombosis (DVT). * **C. Paroxysmal Nocturnal Hemoglobinuria (PNH):** This is a high-yield cause of thrombosis. The deficiency of CD55/CD59 leads to complement-mediated platelet activation. Thrombosis (especially in the hepatic vein—Budd-Chiari syndrome—and DVT) is the **leading cause of death** in PNH. ### **High-Yield Clinical Pearls for NEET-PG:** * **Most common genetic cause of DVT:** Factor V Leiden mutation (Resistance to Activated Protein C) [3]. * **Trousseau Sign:** Migratory thrombophlebitis associated with visceral malignancies (especially pancreatic adenocarcinoma). * **Homan’s Sign:** Calf pain on dorsiflexion of the foot; classic but non-specific clinical sign for DVT. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Hemodynamic Disorders, Thromboembolic Disease, and Shock, pp. 132-133. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, pp. 644-645. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Hemodynamic Disorders, Thromboembolic Disease, and Shock, pp. 133-134. [4] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 141-142.

Question 158: ANCA is found in all of the following conditions EXCEPT?

A. Wegener's granulomatosis
B. Churg-Strauss disease
C. Microscopic polyangiitis
D. Takayasu arteritis (Correct Answer)

Explanation: **Explanation:** The correct answer is **Takayasu arteritis** because it is a **Large Vessel Vasculitis**, whereas ANCA (Antineutrophil Cytoplasmic Antibodies) are specifically associated with **Small Vessel Vasculitis**. **1. Why Takayasu Arteritis is the correct answer:** Takayasu arteritis (also known as "Pulseless disease") is a granulomatous inflammation of the aorta and its major branches [1]. Its pathogenesis is primarily cell-mediated immunity, not autoantibody-driven. Diagnosis relies on imaging (angiography) showing arterial narrowing or aneurysms, and it is characteristically **ANCA-negative** [1]. **2. Why the other options are incorrect:** Options A, B, and C constitute the three primary **ANCA-Associated Vasculitides (AAV)**: * **Wegener’s Granulomatosis (Granulomatosis with Polyangiitis):** Strongly associated with **c-ANCA** (anti-PR3) [2]. It presents with the triad of upper respiratory, lower respiratory, and renal involvement [2], [4]. * **Churg-Strauss Disease (Eosinophilic Granulomatosis with Polyangiitis):** Associated with **p-ANCA** (anti-MPO). Key features include asthma, peripheral eosinophilia, and granulomatous inflammation. * **Microscopic Polyangiitis (MPA):** Associated with **p-ANCA** (anti-MPO) [3]. Unlike Wegener’s, it lacks granulomatous inflammation and nasopharyngeal involvement [3]. **High-Yield Clinical Pearls for NEET-PG:** * **c-ANCA (Cytoplasmic):** Targets Proteinase-3 (PR3). Most specific for Wegener’s [2]. * **p-ANCA (Perinuclear):** Targets Myeloperoxidase (MPO). Seen in MPA, Churg-Strauss, and Primary Sclerosing Cholangitis. * **Large Vessel Vasculitis:** Includes Takayasu Arteritis and Giant Cell (Temporal) Arteritis [1]. Both are ANCA-negative and typically show a high ESR. * **Pauci-immune Glomerulonephritis:** A hallmark of ANCA-associated vasculitis, referring to minimal immune complex deposition in the kidneys [3]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 516-517. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 519-520. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 518-519. [4] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Diseases Of The Urinary And Male Genital Tracts, pp. 536-537.

Question 159: Which of the following is classified as a small vessel vasculitis?

A. Classical Polyarteritis Nodosa (PAN)
B. Granulomatosis with Polyangiitis (Wegener's) (Correct Answer)
C. Giant Cell Arteritis
D. All of the above

Explanation: **Explanation:** Vasculitides are classified based on the caliber of the blood vessels they primarily affect, according to the **Chapel Hill Consensus Conference (CHCC)** criteria. **Why Option B is Correct:** **Granulomatosis with Polyangiitis (GPA)**, formerly known as Wegener’s, is a classic example of **Small Vessel Vasculitis** [1]. It primarily involves small arteries, arterioles, capillaries, and venules [2]. It is characterized by a triad of necrotizing granulomas of the respiratory tract, necrotizing vasculitis, and focal necrotizing glomerulonephritis [1], [2]. It is strongly associated with **c-ANCA (PR3-ANCA)** [1]. **Why Other Options are Incorrect:** * **Option A: Classical Polyarteritis Nodosa (PAN)** is a **Medium Vessel Vasculitis** [3]. It involves necrotizing inflammation of medium-sized or small arteries but, crucially, **spares** capillaries, venules, and arterioles (it does not cause glomerulonephritis). It is often associated with Hepatitis B. * **Option C: Giant Cell Arteritis (GCA)** is a **Large Vessel Vasculitis**. It typically affects the aorta and its major branches, particularly the extracranial branches of the carotid artery (e.g., temporal artery). **High-Yield NEET-PG Pearls:** 1. **Small Vessel Vasculitis Sub-types:** * *ANCA-associated:* GPA (c-ANCA), Microscopic Polyangiitis (p-ANCA), and Churg-Strauss Syndrome (p-ANCA). * *Immune Complex-mediated:* Henoch-Schönlein Purpura (IgA), Cryoglobulinemic vasculitis. 2. **Key Distinction:** If a question mentions "glomerulonephritis" or "alveolar hemorrhage," think **Small Vessel Vasculitis** [2]. 3. **PAN Rule-out:** PAN is "ANCA-negative" and characteristically spares the pulmonary circulation. **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. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Diseases Of The Urinary And Male Genital Tracts, pp. 536-537. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Cardiovascular Disease, pp. 278-279.

Question 160: The most commonly affected arteries seen by arteriography in Takayasu's arteritis is:

A. Abdominal aorta
B. Common carotid artery
C. Subclavian artery (Correct Answer)
D. Aortic arch or root

Explanation: **Explanation:** **Takayasu’s Arteritis (TA)**, also known as "Pulseless Disease," is a chronic granulomatous large-vessel vasculitis that primarily affects the aorta and its major branches [1]. **1. Why Subclavian Artery is Correct:** According to large-scale angiographic studies (including those by the National Institutes of Health), the **subclavian artery** is the most frequently involved vessel in Takayasu’s arteritis (seen in ~85-93% of cases). Involvement is typically bilateral and results in the classic clinical presentation of absent or diminished peripheral pulses and significant blood pressure discrepancies between the arms. **2. Analysis of Incorrect Options:** * **Abdominal Aorta:** While frequently involved (~50% of cases), it is less common than the subclavian or the descending thoracic aorta. * **Common Carotid Artery:** This is the second most common site (~60-70%). Involvement leads to visual disturbances, syncope, or "carotidynia." * **Aortic Arch or Root:** While the disease is often called "Aortic Arch Syndrome," the arch itself is involved less frequently than its primary branches (the subclavian and carotid arteries) [2]. **3. NEET-PG High-Yield Pearls:** * **Demographics:** Most common in females <40 years of age (Asian descent) [1]. * **Pathology:** Transmural granulomatous inflammation leading to "tree-barking" of the intima and segmental stenosis. * **Clinical Sign:** Asymmetric pulses and bruits (especially over the subclavian or abdominal aorta). * **Diagnosis:** Gold standard is **Conventional Angiography** (shows "string of pearls" appearance or tapered narrowing), though MRA/CTA are now preferred first-line. * **Classification:** Type I (Arch branches), Type II (Ascending/Arch), Type III (Thoracic/Abdominal), Type IV (Abdominal/Renal), Type V (Generalized). **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 516-517. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Osteoarticular And Connective Tissue Disease, pp. 688-689.

Practice by Chapter

Atherosclerosis

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Hypertensive Vascular Disease

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Aneurysms and Dissection

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Vasculitis

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Venous Disease and Thrombosis

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Vascular Tumors

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Varicose Veins and Lymphatics

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Pathology of Vascular Interventions

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Vascular Diseases in Specific Organs

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Congenital Vascular Anomalies

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