Cardiovascular Radiology Practice Questions

Q: Which view is taken for aortic window?

LAO. ***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.

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

Figure of 3 sign. ***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.

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

IVUS. ***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.

Q: Identify the condition in the X-ray given below:

TOF. ***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.

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

Ebstein anomalies. ***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.

Q: 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?

Coarctation of Aorta. ***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.

Q: Boot shape of heart in TOF is due to:

Right ventricular hypertrophy. ***Right ventricular hypertrophy*** - The characteristic **boot-shaped heart (coeur en sabot)** seen in Tetralogy of Fallot (TOF) on a chest X-ray is primarily due to **right ventricular hypertrophy** and the small pulmonary artery. - The hypertrophied right ventricle lifts the cardiac apex, while the concavity in the area of the pulmonary artery (due to **pulmonary stenosis**) gives the heart its distinctive shape. *Enlargement of the left atrium* - Left atrial enlargement is not a feature of **Tetralogy of Fallot**; in fact, chronic pulmonary outflow obstruction often leads to a relatively normal or small left atrium. - This condition involves right-sided heart abnormalities, and left atrial enlargement would suggest increased left-sided pressures, which are not typical for TOF. *Enlargement of the right atrium* - While right atrial enlargement can occur in severe cases of TOF due to increased resistance to blood flow, it is **right ventricular hypertrophy** that is the primary determinant of the classic boot-shaped cardiac silhouette. - Right atrial enlargement alone does not create the specific "boot" appearance which is largely due to the ventricular contour. *Hypertrophy of both ventricles* - In Tetralogy of Fallot, the primary ventricular abnormality is **right ventricular hypertrophy**, driven by the need to pump blood through a stenosed pulmonary artery. - The left ventricle typically maintains a normal size and function, as it primarily pumps into the systemic circulation and is not directly affected by the primary defects in the same way as the right ventricle.

Q: For pericardial calcifications, which is the best investigation?

CT scan. ***Correct: CT scan*** - **CT scans** are highly sensitive and specific for detecting **pericardial calcifications** due to their excellent spatial resolution and ability to measure calcium density (Hounsfield units). - They provide detailed anatomical information about the **pericardium** and can accurately map the extent, location, and thickness of calcified areas. - **CT is the gold standard** for detecting and quantifying pericardial calcification, particularly in constrictive pericarditis. *Incorrect: Ultrasound* - While ultrasound (echocardiography) can visualize the pericardium and may detect calcifications, its ability to definitively identify and characterize **calcifications** is limited compared to CT. - **Acoustic shadowing** from calcifications can obscure underlying structures, making a precise assessment challenging. - Useful for detecting pericardial effusion and thickening, but not optimal for calcification assessment. *Incorrect: MRI* - **MRI excels** in visualizing soft tissues, pericardial inflammation, and fluid collections, but it is **poor at detecting calcium**. - Calcifications typically appear as signal voids (black) on MRI, making it difficult to differentiate them from other structures, air, or motion artifacts. - MRI is valuable for assessing pericardial inflammation and constriction but not the preferred method for calcification. *Incorrect: Transesophageal echocardiography* - TEE offers high-resolution images of cardiac structures and is primarily used for assessing valve function, intracardiac masses, endocarditis, and aortic pathology. - Its utility in detecting and characterizing **pericardial calcifications** is limited compared to CT, especially for diffuse or subtle calcifications. - The pericardium is not optimally visualized with TEE compared to transthoracic echocardiography.

Q: Which of the following conditions is NOT associated with a flask-shaped heart?

TAPVC. ***TAPVC*** - **Total anomalous pulmonary venous connection (TAPVC)** is characterized by normal heart size or mild cardiomegaly, but not typically a flask-shaped heart. - The distinctive finding in TAPVC on chest X-ray is often a **"snowman" or "figure-of-8" sign** due to a large supracardiac venous confluence and dilated SVC, rather than a globally enlarged, flask-shaped silhouette. *Ebstein anomaly* - **Ebstein anomaly** involves apical displacement of the tricuspid valve, leading to massive right atrial enlargement and often severe tricuspid regurgitation. - The marked right atrial dilatation causes a very large, globular heart silhouette on chest X-ray, classically described as **flask-shaped** or **box-shaped heart**. *Pericardial effusion* - A significant **pericardial effusion** causes the heart shadow to appear enlarged and globular, with smooth borders and blunting of the cardiac waist. - This classic appearance is described as a **flask-shaped** or **"water-bottle heart"**, as the fluid accumulation distends the pericardial sac symmetrically. *Atrial Septal Defect (ASD)* - **ASD** with significant left-to-right shunt causes volume overload of the right atrium and right ventricle. - This leads to **cardiomegaly** with a globular, flask-shaped cardiac silhouette, increased pulmonary vascular markings (shunt vascularity), and prominent pulmonary artery segment.

Q: Which of the following conditions is the MOST COMMON cause of rib notching?

Coarctation of aorta. ***Coarctation of aorta*** - **Coarctation of the aorta** is the classic and **most common cause** of rib notching. - The notching is caused by the enlargement and tortuosity of the **intercostal arteries** as they provide collateral circulation to bypass the narrowed aorta. *Chronic superior venacava obstruction* - Chronic superior vena cava (SVC) obstruction may lead to the development of collateral circulation through the azygos and hemiazygos veins, but it does **not typically cause rib notching**. - Rib notching is specifically related to collateral flow bypassing an aortic obstruction, not a venous obstruction. *Atrial septal defect* - An **atrial septal defect (ASD)** is a communication between the atria that can lead to right heart volume overload and pulmonary hypertension. - While it's a congenital heart defect, an ASD does **not cause rib notching** as it does not involve an obstruction of systemic arterial flow requiring collateral circulation via the intercostal arteries. *Congenital interruption of aorta* - While **congenital interruption of the aorta** also involves an aortic obstruction, it is a **much rarer condition** than coarctation of the aorta. - Due to its rarity, it is not considered the most common cause of rib notching, even though it would theoretically lead to similar collateral vessel formation.

Question 1

Which view is taken for aortic window?

Accepted Answer

LAO

Answer

AP

Answer

RAO

Answer

LPO

Question 2

Which of the following is a radiological feature of coarctation of the aorta?

Accepted Answer

Figure of 3 sign

Answer

Reverse figure of 3 sign

Answer

Bump sign

Answer

None of the options

Question 3

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

Accepted Answer

IVUS

Answer

MRI

Answer

CMR

Answer

CCTA

Question 4

Identify the condition in the X-ray given below:

Accepted Answer

TOF

Answer

TGA

Answer

TAPVC

Answer

Ebstein's anomaly

Question 5

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

Accepted Answer

Ebstein anomalies

Answer

Tricuspid Atresia

Answer

Double outlet right ventricle

Answer

Hypoplastic left heart syndrome

Question 6

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?

Accepted Answer

Coarctation of Aorta

Answer

Tetralogy of Fallot

Answer

Ebstein's Anomaly

Answer

TAPVC

Question 7

Boot shape of heart in TOF is due to:

Accepted Answer

Right ventricular hypertrophy

Answer

Enlargement of the left atrium

Answer

Enlargement of the right atrium

Answer

Hypertrophy of both ventricles

Question 8

For pericardial calcifications, which is the best investigation?

Accepted Answer

CT scan

Answer

Ultrasound

Answer

MRI

Answer

Transesophageal echocardiography

Question 9

Which of the following conditions is NOT associated with a flask-shaped heart?

Accepted Answer

TAPVC

Answer

Ebstein anomaly

Answer

Pericardial effusion

Answer

Atrial Septal Defect (ASD)

Question 10

Which of the following conditions is the MOST COMMON cause of rib notching?

Accepted Answer

Coarctation of aorta

Answer

Atrial septal defect

Answer

Chronic superior venacava obstruction

Answer

Congenital interruption of aorta

Cardiovascular Radiology — MCQs

Cardiovascular Radiology — MCQs

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