Congenital Vascular Anomalies — MCQs
What is the next best step for a 22-year-old with a hepatic hemangioma on ultrasound?
A 7-year old boy presents with a right-sided hemangioma and left-sided focal seizures. The most likely diagnosis is:
Which skin lesion is associated with Sturge-Weber syndrome?
What is the most common orbital tumor in children?
Which of the following findings on colonoscopy is most consistent with angiodysplasia?
Monckeberg's calcific sclerosis primarily affects which layer of the medium-sized muscular arteries?
A red soft to firm swelling on the sternum shows proliferation of endothelial cells forming vascular channels on biopsy. What is the most likely diagnosis?
The histological image shows a blood vessel with characteristic changes. What is the most likely diagnosis?
Angiofibroma bleeds profusely because:
Lines of Zahn occur in -
Congenital Vascular Anomalies Indian Medical PG Practice Questions and MCQs
Question 1: What is the next best step for a 22-year-old with a hepatic hemangioma on ultrasound?
- A. Angiography
- B. CT
- C. Biopsy
- D. MRI (Correct Answer)
Explanation: ***MRI*** - **Magnetic Resonance Imaging (MRI)** is the most sensitive and specific imaging modality for confirming the diagnosis of a **hepatic hemangioma** due to its characteristic enhancement patterns. - An MRI with contrast (e.g., gadolinium) can definitively distinguish a hemangioma from other **benign or malignant liver lesions**, especially when the ultrasound findings are equivocal. *Angiography* - **Angiography** is an invasive procedure and is typically reserved for cases where **embolization** or surgical resection of a very large or symptomatic hemangioma is being considered. - It is not the initial diagnostic choice for confirming a suspected hemangioma identified on **ultrasound**. *CT* - A **CT scan** with contrast can also characterize a hemangioma, showing peripheral nodular enhancement followed by progressive centripetal fill-in. - However, **MRI** generally offers superior soft tissue contrast and provides more definitive diagnostic features for hemangiomas, particularly in younger patients where radiation exposure from CT is a concern. *Biopsy* - **Biopsy** of a suspected hepatic hemangioma is generally contraindicated due to the risk of **hemorrhage** and is rarely necessary for diagnosis. - Imaging characteristics (especially on MRI) are usually sufficient to confirm the diagnosis without the need for an invasive procedure.
Question 2: A 7-year old boy presents with a right-sided hemangioma and left-sided focal seizures. The most likely diagnosis is:
- A. Incontinentia pigmenti
- B. Sturge-Weber disease (Correct Answer)
- C. Neurofibromatosis
- D. Hypermelanosis of Ito
Explanation: ***Sturge-Weber disease*** - The classic presentation of a **facial hemangioma** (port-wine stain) and **focal seizures** on the contralateral side is highly characteristic of Sturge-Weber disease. - This neurocutaneous syndrome involves a **leptomeningeal angioma** on the same side as the facial hemangioma, leading to neurological symptoms. *Incontinentia pigmenti* - This X-linked dominant disorder primarily affects females and presents with **skin lesions** that evolve through vesicular, verrucous, and hyperpigmented stages, often in a **linear pattern**. - While it can cause neurological symptoms, a unilateral hemangioma and contralateral focal seizures are not typical. *Neurofibromatosis* - Neurofibromatosis Type 1 (NF1) is characterized by **café-au-lait spots**, **axillary/inguinal freckling**, and **neurofibromas**. - While seizures can occur, the combination of a unilateral hemangioma and contralateral focal seizures is not the hallmark presentation of neurofibromatosis. *Hypermelanosis of Ito* - This condition is characterized by **streaky or whorled hyperpigmentation** patterns on the skin, often following Blaschko's lines. - While neurological abnormalities can be associated, the primary cutaneous manifestation is diffuse hyperpigmentation, not a focal hemangioma.
Question 3: Which skin lesion is associated with Sturge-Weber syndrome?
- A. Port-wine stain (Correct Answer)
- B. Strawberry nevus
- C. Mongolian spot
- D. Salmon patch
Explanation: ***Port-wine stain*** - A **port-wine stain (nevus flammeus)**, especially when located on the face following the trigeminal nerve distribution, is the characteristic skin lesion of **Sturge-Weber syndrome**. - Sturge-Weber syndrome is a **neurocutaneous disorder** associated with neurological abnormalities like seizures, glaucoma, and leptomeningeal angioma. *Salmon patch* - A **salmon patch (nevus simplex)** is a common, benign vascular lesion typically found on the eyelids, glabella, or nape of the neck. - Unlike a port-wine stain, a salmon patch usually **fades within the first year of life** and is not associated with Sturge-Weber syndrome. *Strawberry nevus* - A **strawberry nevus (infantile hemangioma)** is a common benign vascular tumor that typically appears a few weeks after birth, grows rapidly, and then usually regresses spontaneously by age 5-10. - It is a **raised, bright red lesion** that is distinct from the flat, diffuse appearance of a port-wine stain and not directly linked to Sturge-Weber syndrome. *Mongolian spot* - A **Mongolian spot (dermal melanocytosis)** is a benign, flat, bluish-gray pigmented lesion commonly found on the lower back or buttocks of infants, particularly those with darker skin tones. - It results from **melanocytes trapped in the dermis** and typically fades during childhood, having no association with Sturge-Weber syndrome.
Question 4: What is the most common orbital tumor in children?
- A. Nerve sheath tumor
- B. Hemangioma (Correct Answer)
- C. Lymphoma
- D. Meningioma
Explanation: ***Hemangioma*** - **Capillary hemangioma** is the **most common benign orbital tumor/mass** in children, typically presenting in the first few months of life. - It is characterized by **rapid growth during the first year**, followed by **spontaneous involution** (usually complete by age 5-7 years). - These lesions are composed of rapidly proliferating endothelial cells and can cause **proptosis, ptosis**, and, if large, **amblyopia** due to visual axis obstruction or induced astigmatism. - Management is often conservative (observation) unless vision-threatening, in which case systemic steroids or propranolol may be used. *Nerve sheath tumor* - **Optic nerve sheath meningiomas** and **schwannomas** are rare in children, typically presenting in older adults. - While they can cause visual impairment and proptosis, their incidence in the pediatric population is significantly lower than hemangiomas. *Lymphoma* - **Orbital lymphoma** is exceedingly rare in children and is typically a tumor of adulthood, often associated with systemic lymphoma. - When it does occur in children, it might be a manifestation of a more widespread lymphoproliferative disorder. *Meningioma* - **Meningiomas** generally arise from arachnoid cap cells and are less common in children than in adults. - In children, they are more often associated with **neurofibromatosis type 2** and tend to be more aggressive.
Question 5: Which of the following findings on colonoscopy is most consistent with angiodysplasia?
- A. Inflamed diverticula
- B. Dilated submucosal veins (Correct Answer)
- C. Mucosal ulcers
- D. Mass lesion
Explanation: Dilated submucosal veins - **Angiodysplasia** is characterized by the presence of **dilated, tortuous submucosal venules and capillaries** that are prone to bleeding. - On colonoscopy, these lesions typically appear as small, flat, cherry-red spots or fern-like vascular patterns. *Inflamed diverticula* - **Diverticulitis** involves inflammation and infection of outpouchings in the colon wall, presenting with pain, fever, and leukocytosis. - Colonoscopy during acute diverticulitis is generally avoided due to the risk of perforation, and the findings would be localized inflammation, not dilated vessels indicative of angiodysplasia. *Mucosal ulcers* - **Mucosal ulcers** are breaks in the mucosal lining, often associated with inflammatory bowel disease, infections, or ischemia. - While ulcers can cause bleeding, they represent a different pathological process than the vascular malformations characteristic of angiodysplasia. *Mass lesion* - A **mass lesion** suggests a tumor, polyp, or other growth within the colon. - This finding is more indicative of a neoplastic process or a large inflammatory lesion, distinct from the small, flat vascular lesions of angiodysplasia.
Question 6: Monckeberg's calcific sclerosis primarily affects which layer of the medium-sized muscular arteries?
- A. Intima
- B. Media (Correct Answer)
- C. Adventitia
- D. Intima and Media
Explanation: ***Media*** - Monckeberg's calcific sclerosis, also known as **medial calcinosis**, specifically involves the **tunica media** of medium-sized muscular arteries. - This condition is characterized by **calcific deposits** within the smooth muscle layer of the artery wall, without significant luminal narrowing. - Classic "**tram-track**" or "railroad track" appearance on imaging due to medial calcification. *Intima* - The **intima** is primarily affected in **atherosclerosis**, where plaque formation occurs within this innermost layer. - Monckeberg's sclerosis is distinct from atherosclerosis and does not involve significant intimal thickening or lipid deposition. *Adventitia* - The **adventitia** is the outermost layer of the arterial wall, providing structural support and containing nerves and vasa vasorum. - Monckeberg's calcification does not typically involve this layer. *Intima and Media* - While Monckeberg's sclerosis **exclusively affects the media**, this option incorrectly suggests intimal involvement. - The pathognomonic feature of Monckeberg's is its **restriction to the medial layer**, distinguishing it from atherosclerosis.
Question 7: A red soft to firm swelling on the sternum shows proliferation of endothelial cells forming vascular channels on biopsy. What is the most likely diagnosis?
- A. Hemangioma (Correct Answer)
- B. Osteochondroma
- C. Osteoid osteoma
- D. Paget disease
Explanation: ***Hemangioma*** - The soft to firm swelling and histological findings indicative of vascular spaces are characteristic of a **hemangioma**, often presenting as a benign vascular tumor [1][2]. - Commonly found in the **sternum**, it may show red or bluish discoloration and typically undergoes a **biopsy** revealing endothelial cell proliferation [2]. *Osteochondroma* - This is a **benign bone tumor** that arises from the growth plate but typically presents as a hard, bony mass rather than a soft swelling. - Histologically, it shows **cartilaginous cap** and is associated with bone rather than vascular structures. *Osteoid osteoma* - Usually presents as a **painful, small bone lesion** often found in the long bones, generally not in the sternum and characterized by a **nidus** of osteoid. - The biopsy would show a **central nidus** with osteoid and woven bone, not consistent with soft swellings. *Paget disease* - This chronic bone disorder involves excessive bone remodeling, leading to enlarged and deformed bones rather than a discrete swelling. - Histologically, it would show **disorganized bone** formation and is not associated with soft or firm masses like hemangiomas. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 481-482. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 523-524.
Question 8: The histological image shows a blood vessel with characteristic changes. What is the most likely diagnosis?
- A. Monckeberg's arteriosclerosis
- B. Fibrinoid necrosis
- C. Hyaline arteriolosclerosis (Correct Answer)
- D. Hyperplastic arteriosclerosis
Explanation: ***Hyperplastic arteriosclerosis*** - The image likely shows **onion-skinning** of the arteriolar wall, which is characteristic of hyperplastic arteriosclerosis [1][2]. - This condition is typically seen in severe or **malignant hypertension** due to proliferation of smooth muscle cells and thickening of the basement membrane [1][2]. *Monckeberg's arteriosclerosis* - This involves **calcification of the media** of muscular arteries, without significant luminal narrowing. - It is typically asymptomatic and does not present with the **onion-skinning** appearance. *Hyaline arteriosclerosis* - Characterized by **homogeneous, pink, hyaline thickening** of arteriolar walls with luminal narrowing. - It is associated with benign hypertension and diabetes, but does not show the **concentric lamellar** appearance. *Fibrinoid necrosis* - This involves **deposition of fibrin-like material** in the vessel wall, often seen in malignant hypertension or vasculitis [3]. - While it can occur in severe hypertension, the primary image finding described as **onion-skinning** is more specific to hyperplastic arteriosclerosis [1]. **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. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Cardiovascular Disease, pp. 276-277.
Question 9: Angiofibroma bleeds profusely because:
- A. It has multiple sites of origin
- B. Vessels lack a contractile component (Correct Answer)
- C. It lacks a capsule
- D. None of the options
Explanation: ***Vessels lack a contractile component*** - The distinctive feature of angiofibroma is the presence of **abundant, thin-walled blood vessels** that lack the typical muscular or elastic contractile layers found in normal arteries. - This structural deficiency prevents effective **vasoconstriction** and vessel closure, leading to severe and prolonged bleeding when injured. *It has multiple sites of origin* - While angiofibromas typically arise from the **nasopharynx**, their propensity to bleed is not related to having multiple sites of origin. - Their origin site does not inherently determine the vascular structure or bleeding risk. *It lacks a capsule* - The absence of a capsule can make surgical resection challenging and contribute to incomplete excision, but it does not directly explain the **profuse bleeding** from within the tumor itself. - Bleeding is primarily due to the internal vascular architecture rather than the presence or absence of a surrounding capsule. *None of the options* - This option is incorrect because the statement "Vessels lack a contractile component" accurately explains why angiofibromas bleed profusely. - The other options are not the primary reason for the extensive bleeding characteristic of these tumors.
Question 10: Lines of Zahn occur in -
- A. Thrombus (Correct Answer)
- B. Embolus
- C. Infarct
- D. Postmortem clot
Explanation: ***Thrombus*** - **Lines of Zahn** are alternating layers of **platelets** (lighter bands) and **red blood cells** (darker bands) that are characteristic of a **thrombus** formed in flowing blood. - Their presence indicates that the clot was formed in a vessel where there was **blood flow** *Infarct* - An **infarct** is an area of **ischemic necrosis** caused by occlusion of either the arterial supply or venous drainage in a particular tissue. - While a thrombus can cause an infarct, an infarct itself does not contain Lines of Zahn; rather, it is the consequence of the thrombus. *Embolus* - An **embolus** is a detached intravascular solid, liquid, or gaseous mass that is carried by the blood to a site distant from its origin. - An embolus can be a fragment of a thrombus and therefore could contain Lines of Zahn, but the primary structure where these lines are formed is the stationary thrombus within a vessel. *Postmortem clot* - A **postmortem clot** forms after death and is typically gelatinous, poorly attached to the vessel wall, and has a dark red dependent portion (due to red cell settling) and a yellowish upper portion (like "chicken fat"). - It does not exhibit the layered architecture of platelets and red blood cells seen in **Lines of Zahn**, as there is no active blood flow or coagulation process at play.
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