Cardiovascular Radiology — MCQs

Cardiovascular Radiology Indian Medical PG Practice Questions and MCQs

Question 131: Which of the following is the most reliable imaging technique for detecting cyanotic congenital heart diseases in newborns?

A. CT angiography
B. Echocardiography (Correct Answer)
C. MRI
D. Chest X-ray

Explanation: ***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 132: A child with Tetralogy of Fallot presents with cyanosis. Which imaging modality is essential for surgical planning?

A. Chest X-ray
B. Echocardiography (Correct Answer)
C. CT scan
D. MRI

Explanation: ***Echocardiography*** - **Echocardiography** is the primary imaging modality for diagnosing and evaluating Tetralogy of Fallot, providing detailed information on the four classic defects: **ventricular septal defect (VSD)**, **pulmonary stenosis**, **overriding aorta**, and **right ventricular hypertrophy**. - It allows for assessment of the size and location of the VSD, the severity of pulmonary stenosis, precise measurements of ventricular and great vessel dimensions, and the evaluation of associated anomalies crucial for detailed **surgical planning**. *Chest X-ray* - A **chest X-ray** provides general information about the heart size and pulmonary vasculature (e.g., "boot-shaped heart"), but lacks the detailed anatomical and physiological information needed for comprehensive **surgical planning**. - While useful for initial assessment, it cannot visualize the specific cardiac malformations with the precision required to guide surgical repair in Tetralogy of Fallot. *CT scan* - **CT scans** provide excellent anatomical detail, especially for extracardiac structures or complex vascular anomalies, but expose the patient to **ionizing radiation**, and its primary role is usually supplementary to echocardiography. - While it can delineate the great vessels and pulmonary arteries, it is often reserved for cases where echocardiography is inconclusive or additional information is required, rather than being the essential first-line modality for primary surgical planning in Tetralogy of Fallot. *MRI* - **Cardiac MRI** offers comprehensive anatomical and functional assessment without radiation exposure and is particularly useful for quantifying ventricular volumes and flow, especially in older children or for follow-up. - However, for the initial diagnosis and immediate surgical planning in infants and young children with Tetralogy of Fallot, **echocardiography** remains superior due to its real-time imaging, portability, and lack of necessity for sedation in many cases.

Question 133: Which imaging modality is essential for diagnosing Tetralogy of Fallot and planning surgical intervention in infants?

A. Chest X-ray
B. Echocardiography (Correct Answer)
C. CT scan
D. MRI

Explanation: ***Echocardiography*** - **Echocardiography** is the primary diagnostic tool as it provides real-time, detailed visualization of the heart's structures and blood flow, essential for identifying the four defects of **Tetralogy of Fallot** (**VSD**, **pulmonary stenosis**, **overriding aorta**, and **right ventricular hypertrophy**). - It non-invasively assesses the **severity of pulmonary stenosis**, the size of the **VSD**, and the extent of **right ventricular hypertrophy**, guiding surgical planning without radiation exposure. *Chest X-ray* - A chest X-ray can show generalized heart size and lung vasculature, and in Tetralogy of Fallot, it often reveals a "**boot-shaped heart**" due to **right ventricular hypertrophy** and an upturned apex due to a small pulmonary artery. - While suggestive, it lacks the detailed anatomical information required for definitive diagnosis or comprehensive surgical planning on its own. *CT scan* - While a **CT scan** offers excellent spatial resolution for anatomical details and can be useful in complex cases or for evaluating the **pulmonary arteries**, it involves significant **radiation exposure**, which is a major concern in infants. - It is usually reserved for situations where echocardiography is inconclusive or additional anatomical detail is needed, especially for extracardiac structures or detailed pulmonary artery mapping, but is not typically the first-line diagnostic and surgical planning tool. *MRI* - **Cardiac MRI** provides highly detailed anatomical and functional information without radiation exposure, making it valuable for assessing complex congenital heart disease, especially for evaluating the **right ventricular volume** and **pulmonary artery anatomy**. - However, it often requires **sedation** or **anesthesia** in infants due to the need for prolonged stillness, making it less practical as a primary diagnostic tool compared to echocardiography, which is quicker and more readily performed in an awake infant.

Question 134: Kerley B lines are seen in mitral stenosis when the resting left atrial pressure exceeds which value?

A. 10 mm Hg
B. 30 mm Hg
C. 40 mm Hg
D. 20 mm Hg (Correct Answer)

Explanation: ***20 mm Hg*** - **Kerley B lines** are radiographic signs of **interstitial pulmonary edema**, which in mitral stenosis occurs when the **left atrial pressure** (and subsequent pulmonary venous pressure) rises sufficiently to force fluid into the **lymphatic system** and **interlobular septa**. - This typically happens when the left atrial pressure exceeds approximately **20-25 mmHg**, indicating significant pulmonary congestion and initiating lymphatic engorgement that becomes visible as linear opacities. *10 mm Hg* - A left atrial pressure of 10 mm Hg is generally considered within the **normal physiological range** or only slightly elevated. - At this pressure, the pulmonary capillaries do not typically transude enough fluid to cause **interstitial edema** visible as Kerley B lines. *30 mm Hg* - While a left atrial pressure of 30 mm Hg would definitely cause Kerley B lines to be present, it represents a more severe degree of **pulmonary edema** than the threshold for their initial appearance. - Such pressures often lead to more extensive signs of pulmonary congestion, including **alveolar edema**. *40 mm Hg* - A left atrial pressure of 40 mm Hg indicates **severe pulmonary venous hypertension** and would result in florid **pulmonary edema**, likely including **alveolar edema** in addition to interstitial edema and Kerley B lines. - This is well above the threshold required for the initial appearance of Kerley B lines.

Question 135: Which of the following is a radiological feature of coarctation of the aorta?

A. Figure of 3 sign (Correct Answer)
B. Reverse figure of 3 sign
C. Bump sign
D. None of the options

Explanation: ***Figure of 3 sign*** - The **figure of 3 sign** is the classic radiological finding in coarctation of the aorta, visible on plain **chest X-ray**. - It results from **pre-stenotic dilation** (proximal aorta), **indentation at the coarctation site**, and **post-stenotic dilation** (distal aorta). - The three components create a "3" shape along the left heart border. - Other radiological features of coarctation include **rib notching** (from collateral circulation via intercostal arteries). *Reverse figure of 3 sign* - The **reverse figure of 3 sign** (or **E sign**) is also seen in coarctation of the aorta, but on **barium swallow**. - It represents the **indentation of the esophagus** by the same dilated proximal aorta, coarctation site, and dilated distal aorta. - This is NOT the primary radiological sign and is less commonly used for diagnosis. *Bump sign* - The **bump sign** is not a recognized specific radiological feature of coarctation of the aorta. - This term may refer to prominence of the aortic knuckle or other non-specific findings. - It is not diagnostic for coarctation. *None of the options* - This is incorrect because **figure of 3 sign** is the well-established, pathognomonic radiological sign for coarctation of the aorta on chest X-ray.

Question 136: Which view is taken for aortic window?

A. AP
B. LAO (Correct Answer)
C. RAO
D. LPO

Explanation: ***LAO*** - The **left anterior oblique (LAO) view** is used in **cardiac catheterization and angiography** to optimally visualize the **aortic root and proximal great vessels**. - This projection (particularly **LAO cranial**) provides separation of the aorta from overlapping mediastinal structures and is commonly used to assess the **aortic arch, left main coronary artery origin**, and great vessel relationships. - The LAO view opens up the space between cardiac structures for better delineation. *AP* - An **anteroposterior (AP) view** results in significant **superimposition of the aorta** with the spine and mediastinal structures. - This overlap makes detailed assessment of aortic anatomy difficult during fluoroscopic procedures. *RAO* - The **right anterior oblique (RAO) view** is more commonly used for visualizing the **right coronary artery, right ventricle**, and interventricular septum. - While useful for some aortic root imaging, it may cause overlap with the **pulmonary artery** that obscures optimal aortic window visualization. *LPO* - The **left posterior oblique (LPO) view** is less commonly used in cardiac catheterization. - This projection is not optimal for aortic imaging and is more suited for **left ventricular** assessment.

Question 137: Which imaging modality is most effective for assessing plaque morphology in coronary arteries?

A. MRI
B. CMR
C. IVUS (Correct Answer)
D. CCTA

Explanation: ***IVUS*** - **Intravascular ultrasound (IVUS)** offers high-resolution, cross-sectional imaging of the coronary artery lumen and vessel wall, allowing for detailed assessment of **plaque morphology**, composition, and volume. - It provides crucial information on plaque features such as **lipid core size**, fibrous cap thickness, and presence of calcification, which are important for predicting plaque rupture risk. *MRI* - **Magnetic Resonance Imaging (MRI)** of the coronary arteries is challenging due to respiratory and cardiac motion, and its resolution is generally insufficient for detailed **intracoronary plaque morphology**. - While MRI can assess **myocardial perfusion** and viability, it is not the primary tool for detailed assessment of specific plaque characteristics within the coronary lumen. *CMR* - **Cardiac Magnetic Resonance (CMR)** is excellent for evaluating **myocardial function**, viability, and perfusion, as well as detecting **myocardial fibrosis** or scarring. - However, its resolution is typically too low for detailed **coronary artery plaque characterization** and visualizing the intricate details of plaque morphology within the vessel wall. *CCTA* - **Coronary Computed Tomography Angiography (CCTA)** is effective for identifying and quantifying **coronary artery stenosis** and detecting the presence of coronary atherosclerosis. - While it can identify **calcified plaques** and some non-calcified plaques, its ability to provide high-resolution, detailed information on **plaque morphology** and specific plaque components (e.g., lipid core, fibrous cap) is limited compared to IVUS.

Question 138: Pulmonary plethora is typically seen in all of the following conditions except:

A. Tricuspid Atresia
B. Ebstein anomalies (Correct Answer)
C. Double outlet right ventricle
D. Hypoplastic left heart syndrome

Explanation: ***Ebstein anomaly*** - Ebstein's anomaly involves **tricuspid valve displacement** (apical displacement of septal and posterior leaflets) into the right ventricle, leading to tricuspid regurgitation and an **atrialized portion of the RV**. - Results in **reduced pulmonary blood flow** (pulmonary oligemia) rather than plethora. - Often associated with right-to-left shunting through ASD, further reducing pulmonary flow. - **Classic chest X-ray finding: Decreased pulmonary vascular markings.** *Tricuspid Atresia* - This condition involves **complete absence of the tricuspid valve**, requiring an obligate right-to-left shunt at the atrial level for survival. - **Typically causes pulmonary oligemia** (decreased pulmonary markings), not plethora, as blood cannot flow from RA to RV. - Pulmonary blood flow depends on VSD or PDA, but flow is usually **reduced or balanced**, not increased. - **Note:** While some cases with large VSD/PDA may have increased flow, the **typical presentation is oligemia**, making this option potentially confusing in this question context. *Hypoplastic left heart syndrome (HLHS)* - Severe congenital defect with **underdeveloped left ventricle, mitral valve, and ascending aorta**. - Systemic circulation depends entirely on patent ductus arteriosus and right ventricle. - Chest X-ray typically shows **pulmonary venous congestion** and cardiomegaly, but this represents venous congestion rather than true arterial plethora. - **Not a classic example of pulmonary plethora.** *Double outlet right ventricle (DORV)* - Both **aorta and pulmonary artery arise from the right ventricle**. - Associated with VSD; pulmonary blood flow depends on the VSD location and presence of pulmonary stenosis. - **DORV without pulmonary stenosis** typically shows **increased pulmonary blood flow** (plethora) due to unrestricted flow through the pulmonary artery. - **Classic example of pulmonary plethora** when pulmonary stenosis is absent.

Question 139: The chest radiograph shown below is from a 25-year-old male patient presenting with hypertension. The image demonstrates bilateral inferior rib notching. What is the most likely diagnosis?

A. Tetralogy of Fallot
B. Ebstein's Anomaly
C. TAPVC
D. Coarctation of Aorta (Correct Answer)

Explanation: ***Coarctation of Aorta*** - The chest radiograph shows findings consistent with **rib notching**, which is a classic sign of coarctation of the aorta due to increased collateral circulation through intercostal arteries. - The history of **hypertension** in a male patient, especially if presenting at a younger age or with differential blood pressures between upper and lower extremities, strongly suggests coarctation of the aorta. *Tetralogy of Fallot* - Characterized by a **boot-shaped heart** due to right ventricular hypertrophy and pulmonary outflow obstruction. - Would typically present with **cyanosis** and decreased pulmonary vascular markings, not rib notching or isolated hypertension. *Ebstein's Anomaly* - Involves apical displacement of the **tricuspid valve**, leading to atrialization of the right ventricle and severe tricuspid regurgitation. - Chest X-rays often show **severe cardiomegaly** (huge heart due to right atrial enlargement) and decreased pulmonary vascularity, which are not depicted here. *TAPVC* - Total anomalous pulmonary venous connection (TAPVC) involves all pulmonary veins draining into the systemic circulation. - The classic chest X-ray finding for supracardiac TAPVC is a **"snowman" or "figure of 8" sign** due to dilated anomalous vessels and superior vena cava, which is absent in this image.

Question 140: Identify the condition in the X-ray given below:

A. TGA
B. TAPVC
C. TOF (Correct Answer)
D. Ebstein's anomaly

Explanation: ***TOF*** - The chest X-ray shows a **boot-shaped heart (coeur en sabot)**, which is highly characteristic of **Tetralogy of Fallot** due to right ventricular hypertrophy and pulmonary artery hypoplasia. - There is also **reduced pulmonary vascular markings** (oligemia), indicating decreased blood flow to the lungs, a typical finding in TOF. *TGA* - Transposition of the Great Arteries (TGA) typically presents with a **"egg-on-a-string" appearance** on chest X-ray, characterized by a narrow mediastinum and cardiomegaly, which is not seen here. - Pulmonary vascularity can be increased or normal in TGA, unlike the decreased vascularity observed in the image. *TAPVC* - Total Anomalous Pulmonary Venous Connection (TAPVC) usually shows a **"snowman" or "figure-of-8" heart** shadow on chest X-ray, due to enlarged SVC and innominate vein. - This condition is also associated with **increased pulmonary vascular markings** and often cardiomegaly, which are absent in the provided image. *Ebstein's anomaly* - Ebstein's anomaly is characterized by a **massively enlarged heart** on chest X-ray due to right atrial enlargement and tricuspid regurgitation. - It often shows **reduced pulmonary vascular markings** due to functional pulmonary stenosis, but the characteristic "boot shape" is not typically present.

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