Cardiovascular Radiology Practice Questions

Q: The procedure of choice for the evaluation of an aneurysm is:

Computed tomography. ***Computed tomography*** **Computed tomography (CT)**, particularly **CT angiography (CTA)**, is widely considered the procedure of choice for evaluating aneurysms due to its **rapid acquisition**, **high spatial resolution**, and ability to visualize the vessel lumen and surrounding structures. **Key advantages:** - Particularly useful for assessing aneurysm size, morphology, thrombus formation, and rupture - Excellent for both emergent and elective settings - Widely available and fast imaging acquisition - Provides comprehensive anatomical detail *Ultrasonography* **Ultrasonography** is an excellent and cost-effective **screening tool for abdominal aortic aneurysms (AAA)** because it is non-invasive and does not involve radiation. However, its utility is limited for: - Complex aneurysms requiring detailed anatomical information - Less accessible locations (e.g., thoracic, cerebral aneurysms) - **Operator dependence** and **limited field of view** restrict its use as a definitive diagnostic tool *Magnetic resonance imaging* **Magnetic resonance imaging (MRI)** and **magnetic resonance angiography (MRA)** provide excellent soft tissue contrast without ionizing radiation and can accurately evaluate aneurysm morphology and flow characteristics. However, MRI is: - More time-consuming and expensive - May be contraindicated in patients with metallic implants or claustrophobia - Less suitable for initial acute evaluation compared to CT *Angiography* **Angiography**, traditionally a catheter-based invasive procedure, provides detailed images of the vessel lumen and is excellent for evaluating precise anatomy and planning endovascular repair. While it offers highly detailed images, its: - Invasiveness - Exposure to radiation and contrast agents - Potential for complications These factors typically reserve it for **interventional planning** or when non-invasive methods are inconclusive, rather than as the primary diagnostic tool.

Q: Gas shadow in the heart and great vessels is characteristically seen in:

Air embolism. ***Air embolism*** - An **air embolism** occurs when air or gas enters the bloodstream and travels to the heart or great vessels, appearing as a gas shadow on imaging. - This can be due to medical procedures, trauma, or certain deep-sea diving injuries, where gas forms within the vascular system. *Gas-forming infection* - While gas-forming infections can produce gas, they typically result in gas within tissues or organs, not directly as a prominent gas shadow within the **heart chambers** or **great vessels** themselves. - Examples include **clostridial myonecrosis** or abscesses, which are localized and distinct from an intravascular gas collection. *Traumatic injury* - Traumatic injury can lead to **pneumothorax**, **pneumomediastinum**, or gas in soft tissues, but usually not directly within the heart and great vessels to the extent seen with an air embolism. - While gas might be seen if a vessel or heart chamber is perforated, it is typically a secondary effect and not the primary cause of intravascular gas shadow. *Septic thrombophlebitis* - **Septic thrombophlebitis** involves infected blood clots in veins and can lead to inflammation and systemic infection. - It does not typically generate gas or gas shadows within the heart and great vessels; rather, it involves the presence of pus and infected thrombi.

Q: Snowman sign is seen in:

TAPVC. ***TAPVC*** - The **snowman sign**, or "figure-of-8" or "cottage loaf" heart, is characteristic of **supracardiac total anomalous pulmonary venous connection (TAPVC)**. - It results from the **dilatation of the superior vena cava** and the abnormally draining pulmonary veins entering the innominate vein, forming the "head" of the snowman, combined with the normal cardiac silhouette forming the "body." *VSD* - **Ventricular septal defects (VSDs)** primarily cause left-to-right shunting and may lead to **cardiomegaly** and **pulmonary vascular congestion** but do not typically present with a snowman sign. - The characteristic echocardiographic finding for a VSD is a **defect in the interventricular septum** with turbulent flow. *ASD* - **Atrial septal defects (ASDs)** involve a shunt between the atria and typically manifest with **right ventricular enlargement** and **dilated pulmonary arteries**, but not the characteristic appearance of a snowman. - The chest X-ray in ASD may show **increased pulmonary vascular markings** and cardiomegaly, but not the specific suprasternal widening seen in TAPVC. *TGA* - **Transposition of the great arteries (TGA)** often presents with a **"egg-on-a-string" appearance** on chest X-ray due to a narrow vascular pedicle and cardiomegaly. - This is primarily due to the **aorta arising from the right ventricle** and the **pulmonary artery from the left ventricle**, leading to separate circulations and distinct radiographic findings from TAPVC.

Q: Egg on side appearance is seen in:

TGA. ***TGA*** - Transposition of the Great Arteries (TGA) characteristically presents with a **narrow mediastinum** on chest X-ray, leading to the "egg on a string" or "egg on side" appearance. - This is due to the **aorta** and **pulmonary artery** being transposed, changing the typical vascular shadow. *TAPVC* - Total Anomalous Pulmonary Venous Connection (TAPVC) usually shows a **"snowman" or "figure-of-8" heart** on chest X-ray, particularly in the supracardiac type. - This results from the enlarged superior vena cava and anomalous pulmonary venous collector. *Ebstein anomaly* - Ebstein's anomaly involves downward displacement of the tricuspid valve, leading to a **massive cardiomegaly** and a typically **box-shaped heart** on chest X-ray. - This is caused by the atrialization of the right ventricle and subsequent right atrial enlargement. *TOF* - Tetralogy of Fallot (TOF) classically presents with a **"boot-shaped heart" (coeur en sabot)** on chest X-ray. - This appearance is due to **right ventricular hypertrophy** and an upturned cardiac apex, along with a concave main pulmonary artery segment.

Q: The CT thorax image shows:

Descending aortic dissection. ***Descending aortic dissection*** - The CT image shows a **classic intimal flap** separating the true and false lumens in the descending thoracic aorta, which is the hallmark feature of an aortic dissection. - This represents a **Stanford Type B dissection** involving the descending aorta (distal to the left subclavian artery), which is typically managed **medically** with blood pressure control and monitoring. *Aortic aneurysm* - An **aortic aneurysm** represents focal dilatation of the aortic wall (>50% increase in diameter) without separation of the intimal layers. - The key finding here is the **intimal flap dividing the lumen**, which defines dissection rather than simple aneurysmal dilatation without luminal separation. *Aortic coarctation* - **Aortic coarctation** is a congenital narrowing of the aorta, typically located at the aortic isthmus near the **ligamentum arteriosum**. - CT would show focal narrowing with **pre-stenotic dilatation** and collateral vessel formation, not an intimal flap creating dual lumens. *Ascending aortic dissection* - While the intimal flap is characteristic of dissection, the image shows involvement of the **descending thoracic aorta**, not the ascending aorta (proximal to the left subclavian artery). - Ascending aortic dissections (**Stanford Type A**) are surgical emergencies requiring **immediate operative intervention** due to high risk of rupture and cardiac tamponade.

Q: The Figure of 3 sign on chest X-ray is seen in which condition?

Coarctation of the Aorta. ***Coarctation of the Aorta*** - The **Figure of 3 sign** is a classic radiographic finding in coarctation of the aorta, representing pre- and post-stenotic dilatation along with the indentation of the coarctation itself. - This sign is often accompanied by **rib notching** due to collateral circulation, seen on chest X-ray. *Transposition of the Great Arteries* - Characteristically presents with a **"egg-on-a-string" appearance** on chest X-ray due to a narrow mediastinum and cardiomegaly. - This condition involves the great arteries being **switched**, leading to separate systemic and pulmonary circulations. *Mitral Stenosis* - Chest X-ray findings typically include **left atrial enlargement**, which can cause a "double density" sign or splaying of the carina. - Other findings might include **pulmonary venous hypertension** and kerley B lines, not the Figure of 3 sign. *Aortic Stenosis* - Can cause **post-stenotic dilatation of the ascending aorta**, but it does not produce the characteristic Figure of 3 sign. - Severe aortic stenosis might show **left ventricular hypertrophy** on ECG or echocardiography, but not clearly on a standard chest X-ray.

Q: Chest radiograph obtained from a male patient with hypertension. What could be the probable diagnosis?

Coarctation of Aorta. ***Coarctation of Aorta*** - **Coarctation of the aorta** is a congenital narrowing of the aorta, often presenting with **hypertension** in the upper extremities. - Chest X-rays can show **rib notching** (due to collateral circulation via intercostal arteries) and a **"3" sign** (indentation of the aorta at the coarctation site). *Mitral Stenosis* - **Mitral stenosis** primarily affects the **mitral valve**, leading to left atrial enlargement and pulmonary congestion. - While it can manifest as dyspnea and **pulmonary hypertension**, it does not typically present with the same radiographic findings as coarctation or systemic hypertension alone. *Transposition of Great Arteries* - **Transposition of the great arteries** is a cyanotic congenital heart defect, where the aorta arises from the right ventricle and the pulmonary artery from the left ventricle. - It presents in infancy with **cyanosis** and a characteristic **"egg on a string"** appearance on chest X-ray due to narrow mediastinum and abnormal great vessel alignment. *Aortic Stenosis* - **Aortic stenosis** is the narrowing of the aortic outflow tract, which can cause symptoms like angina, syncope, and heart failure. - While it can lead to **left ventricular hypertrophy** and widened pulse pressure, it is not typically associated with the specific radiographic findings of coarctation and the isolated hypertension in upper limbs.

Q: Which of the following is the most reliable imaging technique for detecting cyanotic congenital heart diseases in newborns?

Echocardiography. ***Correct Answer: Echocardiography*** - **Echocardiography** is the gold standard for diagnosing congenital heart diseases in newborns due to its non-invasive nature, real-time imaging capabilities, and ability to assess blood flow dynamics - Provides detailed anatomical and functional information about the heart, great vessels, and associated anomalies without radiation exposure - Can be performed at bedside and allows Doppler assessment of intracardiac shunts and flow patterns - **First-line investigation** for suspected cyanotic heart disease in the neonatal period *Incorrect: CT angiography* - Involves **radiation exposure**, which is a significant concern in newborns - While it offers excellent anatomical detail, it is typically reserved for complex cases where echocardiography is inconclusive or for surgical planning - Not used as a primary diagnostic tool in neonates *Incorrect: MRI* - Provides comprehensive anatomical and functional data without radiation, but often requires **sedation** in newborns due to long scan times and need for stillness - Limited availability compared to echocardiography makes it less practical as a first-line diagnostic method - Reserved for cases requiring detailed vascular anatomy or when echocardiographic windows are poor *Incorrect: Chest X-ray* - Can show general cardiac size and pulmonary vascularity patterns (increased or decreased), which may suggest congenital heart disease - Provides **limited anatomical detail** and cannot definitively diagnose specific cardiac defects - Useful as an initial screening tool but lacks the detailed functional and structural information needed for definitive diagnosis

Question 1

The procedure of choice for the evaluation of an aneurysm is:

Accepted Answer

Computed tomography

Answer

Ultrasonography

Answer

Magnetic resonance imaging

Answer

Angiography

Question 2

Gas shadow in the heart and great vessels is characteristically seen in:

Accepted Answer

Air embolism

Answer

Gas-forming infection

Answer

Traumatic injury

Answer

Septic thrombophlebitis

Question 3

Snowman sign is seen in:

Accepted Answer

TAPVC

Answer

VSD

Answer

ASD

Answer

TGA

Question 4

Egg on side appearance is seen in:

Accepted Answer

TGA

Answer

TAPVC

Answer

Ebstein anomaly

Answer

TOF

Question 5

Carotid atheromas may appear radiographically as:

Accepted Answer

Both nodular radio-opaque mass and double vertical radio-opaque lines

Answer

Double vertical radio-opaque lines within the neck

Answer

Nodular radio-opaque mass

Answer

None of the options

Question 6

The CT thorax image shows:

Accepted Answer

Descending aortic dissection

Answer

Ascending aortic dissection

Answer

Aortic aneurysm

Answer

Aortic coarctation

Question 7

The Figure of 3 sign on chest X-ray is seen in which condition?

Accepted Answer

Coarctation of the Aorta

Answer

Transposition of the Great Arteries

Answer

Mitral Stenosis

Answer

Aortic Stenosis

Question 8

Chest radiograph obtained from a male patient with hypertension. What could be the probable diagnosis?

Accepted Answer

Coarctation of Aorta

Answer

Mitral Stenosis

Answer

Transposition of Great Arteries

Answer

Aortic Stenosis

Question 9

Which of the following is the most reliable imaging technique for detecting cyanotic congenital heart diseases in newborns?

Accepted Answer

Echocardiography

Answer

CT angiography

Answer

MRI

Answer

Chest X-ray

Question 10

For which of the following conditions is CT thorax considered the gold standard imaging modality for diagnosis?

Accepted Answer

Descending Aortic dissection

Answer

Ascending Aortic dissection

Answer

Aortic aneurysm

Answer

Cystic fibrosis

Cardiovascular Radiology — MCQs

Cardiovascular Radiology — MCQs

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