Cardiovascular Radiology Practice Questions

Q: Left atrial enlargement is best seen with which imaging view?

Barium swallow right anterior oblique view. ### Explanation **1. Why the Correct Answer is Right:** The **Left Atrium (LA)** is the most posterior chamber of the heart. In the mediastinum, it lies in direct contact with the anterior wall of the mid-esophagus. When the left atrium enlarges, it displaces the esophagus posteriorly and to the right. In a **Barium swallow Right Anterior Oblique (RAO) view**, the esophagus is projected between the heart and the spine. This specific orientation provides the highest sensitivity for detecting early LA enlargement, as the opacified esophagus will show a characteristic **posterior indentation or displacement**. **2. Why the Other Options are Wrong:** * **Chest X-ray AP View:** While LA enlargement can be seen here (e.g., double atrial shadow, splaying of the carina), it is less sensitive than barium studies for early detection because the heart is a 3D structure projected onto a 2D plane, leading to overlap. * **Chest X-ray Left Lateral View:** This view can show posterior displacement of the esophagus or the left main bronchus (walking-man sign), but the RAO view with barium provides better anatomical separation and visualization of the esophageal-atrial interface. * **Barium Swallow LAO View:** In the Left Anterior Oblique view, the left atrium is not the primary structure indenting the esophagus; this view is better suited for evaluating the aortic arch and the right ventricle. **3. High-Yield Clinical Pearls for NEET-PG:** * **Earliest sign of LA enlargement on CXR PA view:** Straightening of the left cardiac border. * **Most specific sign on CXR PA view:** Double atrial shadow (Double density sign). * **Carinal Angle:** LA enlargement causes widening of the subcarinal angle (>90 degrees) and elevation of the left main bronchus (**"Walking Man Sign"** on lateral view). * **Mitral Stenosis:** The most common cause of isolated left atrial enlargement.

Q: Which condition is characterized by the presence of the figure of three signs?

Coarctation of Aorta. **Explanation:** The **Figure of 3 sign** is a classic radiological hallmark of **Coarctation of the Aorta** seen on a frontal chest X-ray. It is formed by the contour of the aorta: * **Upper convexity:** Formed by the dilated pre-stenotic segment (left subclavian artery and aortic arch). * **Indentation:** Represents the site of the actual coarctation (narrowing). * **Lower convexity:** Formed by the post-stenotic dilatation of the descending aorta. On a Barium swallow, this same pathology produces the **"E sign"** (or reverse 3 sign) due to the indentation of the esophagus by the dilated segments. **Analysis of Incorrect Options:** * **Mitral Stenosis:** Characterized by left atrial enlargement, leading to a "straightening of the left heart border," "double atrial shadow," and "Kerley B lines" due to pulmonary venous hypertension. * **Transposition of Great Arteries (TGA):** Classically presents with an **"Egg-on-a-string"** appearance due to a narrow mediastinum (atrophy of the thymus and hyperinflated lungs) and a globular heart. * **Aortic Stenosis:** Typically shows a prominent ascending aorta due to post-stenotic dilatation and a "boot-shaped heart" (though more common in Tetralogy of Fallot) or left ventricular hypertrophy (rounded apex). **High-Yield Clinical Pearls for NEET-PG:** * **Rib Notching (Roesler Sign):** Seen in Coarctation, typically involving the 3rd to 8th ribs. It is caused by pressure erosion from dilated intercostal arteries (collateral circulation). It is **not** seen in the 1st and 2nd ribs as they are supplied by the costocervical trunk. * **Clinical Triad:** Radio-femoral delay, upper limb hypertension, and a systolic murmur over the back (interscapular area).

Q: A left-sided cardiac bulge seen on chest X-ray is most likely due to which of the following?

Enlargement of the left atrial appendage. ### Explanation The correct answer is **Enlargement of the left atrial appendage (LAA)**. On a standard frontal chest X-ray (PA view), the **left heart border** is formed by four distinct segments (from superior to inferior): 1. **Aortic Arch (Aortic Knuckle)** 2. **Pulmonary Trunk (Main Pulmonary Artery)** 3. **Left Atrial Appendage (LAA)** 4. **Left Ventricle** Normally, the LAA segment is flat or slightly concave. When the left atrium enlarges (most commonly due to **Mitral Stenosis**), the LAA becomes prominent, creating a "bulge" or "straightening" of the left heart border. This is often referred to as the **"Third Mogul"** sign (the first being the aorta and the second being the pulmonary artery). #### Why the other options are incorrect: * **Azygos vein enlargement:** This typically presents as a rounded opacity at the **right tracheobronchial angle**, not on the left cardiac border. * **Coronary artery aneurysm:** While these can occur, they are rarely large enough to cause a discrete bulge on a routine chest X-ray and are not a classic radiological sign for heart border changes. * **Pulmonary edema:** This presents with bilateral perihilar "bat-wing" opacities, Kerley B lines, and pleural effusions, rather than a localized focal bulge of the cardiac contour. #### High-Yield Clinical Pearls for NEET-PG: * **Mitral Stenosis (MS):** The most common cause of LAA enlargement. Look for the **"Double Density Sign"** (right side) and **"Walking-man sign"** (splaying of the carina) on the same X-ray. * **Right Heart Border:** Formed by the Superior Vena Cava (top) and the Right Atrium (bottom). The Right Ventricle does **not** form a border on the PA view (it is anterior). * **Boot-shaped heart (Coeur en sabot):** Seen in Tetralogy of Fallot due to right ventricular hypertrophy lifting the apex.

Q: What is the procedure of choice for the evaluation of an aortic aneurysm?

Computed Tomography (CT). **Explanation:** The gold standard and procedure of choice for the evaluation of an aortic aneurysm (specifically Abdominal Aortic Aneurysm - AAA) is **Contrast-Enhanced Computed Tomography (CECT)**. **Why CT is the Correct Choice:** CT provides precise anatomical detail, including the maximum diameter of the aneurysm, its longitudinal extent, and its relationship to the renal and iliac arteries. It is essential for **pre-operative planning** (determining suitability for EVAR vs. open repair) and can detect signs of impending rupture (e.g., "draped aorta" sign) or retroperitoneal hemorrhage. **Analysis of Incorrect Options:** * **Ultrasound (USG):** While USG is the investigation of choice for **screening** and longitudinal **monitoring** of small asymptomatic aneurysms due to its low cost and lack of radiation, it is operator-dependent and less accurate for surgical planning. * **MRI:** Offers excellent detail without ionizing radiation, but it is time-consuming, expensive, and often impractical in emergency settings or for patients with metallic implants. * **Angiography:** Historically the gold standard, it is now rarely used for diagnosis. It is an invasive procedure that only visualizes the **lumen**; if a large mural thrombus is present, angiography may underestimate the true size of the aneurysm. **High-Yield Clinical Pearls for NEET-PG:** * **Screening/Initial Investigation:** Ultrasound. * **Pre-operative Planning/Evaluation:** CT Scan. * **Indication for Surgery:** Diameter >5.5 cm in men, >5.0 cm in women, or rapid expansion (>0.5 cm in 6 months). * **Most common site:** Infra-renal (between the renal arteries and the aortic bifurcation). * **Triad of Ruptured AAA:** Hypotension, pulsatile abdominal mass, and back/abdominal pain.

Q: Which of the following statements is TRUE about Coronary Calcium Scoring, EXCEPT?

It requires the administration of iodinated contrast.. ### Explanation **Coronary Artery Calcium (CAC) Scoring** is a non-invasive screening tool used to quantify the burden of atherosclerotic plaque in the coronary arteries. **Why Option B is the correct answer (The "Except" statement):** Coronary Calcium Scoring is a **non-contrast** study. It relies on the high attenuation (density) of calcium deposits, which are naturally radio-opaque. Administering iodinated contrast would fill the vessel lumen with high-density material, making it impossible to distinguish between the contrast in the blood and the calcium in the vessel wall. Contrast is only used in *Coronary CT Angiography (CCTA)*, not for calcium scoring. **Analysis of other options:** * **Option A:** It is performed using **Multi-Detector Computed Tomography (MDCT)**, typically with ECG-gating to minimize motion artifacts from the beating heart. * **Option C:** The **Agatston Score** is the standard reporting method. A score of **>400** represents extensive plaque burden and indicates a very high risk of a major adverse cardiovascular event (MACE). * **Option D:** It is a low-dose procedure. The radiation dose typically ranges between **1–2 mSv**, which is significantly lower than a standard diagnostic CT chest or a full coronary angiogram. --- ### High-Yield Clinical Pearls for NEET-PG * **Agatston Score Categories:** * 0: No disease * 1–10: Minimal disease * 11–100: Mild disease * 101–400: Moderate disease * >400: Severe disease * **Primary Use:** It is most useful for risk stratification in **asymptomatic** individuals with intermediate risk. * **Limitation:** A score of 0 does not 100% rule out CAD, as it cannot detect **"soft" (non-calcified) plaques**, which are prone to rupture. * **Technical Requirement:** Requires a high temporal resolution; hence, a minimum of a 16-slice (preferably 64-slice) CT scanner is used.

Q: Which of the following is NOT a radiological sign of coarctation of the aorta?

'Egg on side' appearance. **Explanation:** The **'Egg on side' (or Egg-on-a-string) appearance** is the classic radiological hallmark of **Transposition of the Great Arteries (TGA)**, not coarctation of the aorta. It occurs due to a narrow mediastinum (caused by the anteroposterior relationship of the great vessels and thymic atrophy) and a globular, enlarged heart. **Analysis of other options:** * **Rib Notching (Roesler’s Sign):** This is a classic sign of post-ductal coarctation. It occurs due to pressure erosion of the inferior margins of the 3rd to 8th ribs by dilated, tortuous intercostal arteries acting as collateral pathways. * **'E' Sign (or Figure-of-3 Sign):** On a Barium swallow, the esophagus shows an **'E' indentation** due to the pre-stenotic dilation, the site of coarctation, and the post-stenotic dilation. On a plain Chest X-ray, the contour of the aorta itself resembles a **'3'**. * **Normal shaped heart:** In many cases of coarctation, the heart size remains normal for a long period because the left ventricular hypertrophy (LVH) is concentric. Cardiomegaly only develops once heart failure ensues. **High-Yield Clinical Pearls for NEET-PG:** * **Rib Notching:** Usually involves the **3rd to 8th ribs**. It spares the 1st and 2nd ribs because their intercostal arteries arise from the costocervical trunk, not the aorta distal to the coarctation. * **Association:** Coarctation is strongly associated with **Bicuspid Aortic Valve** (most common) and **Turner Syndrome**. * **Physical Exam:** Look for **radio-femoral delay** and a blood pressure discrepancy between upper and lower limbs.

Q: Which is the most accurate investigation for assessing left ventricular global systolic function?

MRI. **Explanation:** **Cardiac MRI (CMR)** is currently considered the **Gold Standard** for the assessment of left ventricular (LV) volumes, mass, and global systolic function (Ejection Fraction). Its superiority lies in its high spatial and temporal resolution and its ability to provide three-dimensional volumetric data without relying on geometric assumptions or acoustic windows. Unlike other modalities, MRI provides excellent endocardial border definition, leading to the highest inter-observer reproducibility. **Analysis of Incorrect Options:** * **Echocardiography:** While it is the most common *initial* investigation due to its cost-effectiveness and availability, it is limited by the "acoustic window" (body habitus/lung disease) and relies on geometric assumptions (e.g., Simpson’s rule), which can be inaccurate in remodeled or dilated hearts. * **Multislice CT (MSCT):** Although CT offers excellent spatial resolution and can calculate EF, it involves significant ionizing radiation and iodinated contrast. It is generally reserved for coronary anatomy rather than routine functional assessment. * **Nuclear Scan (MUGA/SPECT):** These are useful for functional assessment but have lower spatial resolution compared to MRI and involve exposure to radioactive isotopes. **Clinical Pearls for NEET-PG:** * **Gold Standard for Myocardial Viability:** Cardiac MRI (Late Gadolinium Enhancement - LGE). * **Gold Standard for Iron Overload (Hemochromatosis):** Cardiac MRI T2* weighted imaging. * **First-line investigation for Valvular Heart Disease:** Echocardiography. * **Best for Coronary Artery Calcium Scoring:** Non-contrast CT.

Q: Hilar dance is seen in fluoroscopy of which condition?

Patent ductus arteriosus. **Explanation:** **Hilar Dance** refers to the visualization of vigorous, expansive pulsations of the pulmonary arteries during fluoroscopy. This phenomenon occurs due to a **large left-to-right shunt**, which leads to increased pulmonary blood flow and a wide pulse pressure within the pulmonary circulation. **Why Patent Ductus Arteriosus (PDA) is correct:** In PDA, blood shunts from the high-pressure aorta into the lower-pressure pulmonary artery. This continuous flooding of the pulmonary bed increases the stroke volume of the pulmonary arteries. During fluoroscopy, these hyperdynamic pulsations are seen at the hilum, creating the "hilar dance." While also seen in ASD and VSD, PDA is a classic cause among the provided options. **Why the other options are incorrect:** * **Aortic Stenosis:** This is an obstructive lesion of the left heart. It leads to post-stenotic dilatation of the ascending aorta, not increased pulmonary artery pulsations. * **Coarctation of Aorta:** This involves narrowing of the aortic arch. Characteristic radiological findings include the "3 sign" on X-ray and rib notching (Roesler’s sign), but it does not cause a hilar dance. * **Mitral Stenosis:** This results in pulmonary venous hypertension and enlarged left atrium. On X-ray, it shows features like Kerley B lines and a "double atrial shadow," but the pulmonary arteries are often constricted (Antler sign) rather than hyperdynamic. **High-Yield Pearls for NEET-PG:** * **Hilar Dance** is most commonly associated with **Atrial Septal Defect (ASD)**, but is also seen in VSD and PDA. * **Waterston’s Groove:** The groove between the right atrium and left atrium, often obliterated in Mitral Stenosis. * **Figure of 3 sign:** Pathognomonic for Coarctation of the Aorta. * **Egg-on-a-string appearance:** Seen in Transposition of the Great Arteries (TGA).

Q: A preterm neonate presents for follow-up with a systolic murmur, tachypnea, and hepatomegaly. Further history reveals the mother had an episode of fever with rash during the antenatal period. If CECT were performed, which of the following marked areas would represent a probable pathology in this neonate?

Area 3. ***Area 3*** - In **congenital rubella syndrome (CRS)**, the **ductus arteriosus** (Area 3) commonly remains patent, causing **left-to-right shunting** and pulmonary overcirculation. - **Patent ductus arteriosus (PDA)** presents with a characteristic **machinery murmur**, **tachypnea**, and **hepatomegaly** due to congestive heart failure. *Area 1* - Area 1 represents the **ascending aorta**, which would not be the primary pathological site in CRS. - While the ascending aorta may show changes secondary to increased cardiac output, it is not the **direct congenital defect** associated with rubella infection. *Area 2* - Area 2 represents the **main pulmonary artery**, which may be dilated secondary to increased flow but is not the primary defect. - **Pulmonary artery dilation** occurs as a consequence of the left-to-right shunt, not as the **primary congenital malformation**. *Area 4* - Area 4 represents the **descending aorta**, which would not show primary pathology in typical CRS cases. - The descending aorta may show **reduced diastolic pressure** due to PDA runoff, but this is a secondary effect, not the **anatomical defect** itself.

Question 1

Left atrial enlargement is best seen with which imaging view?

Accepted Answer

Barium swallow right anterior oblique view

Answer

Chest X-ray AP view

Answer

Chest X-ray left lateral view

Answer

Barium swallow left anterior oblique view

Question 2

Which condition is characterized by the presence of the figure of three signs?

Accepted Answer

Coarctation of Aorta

Answer

Mitral Stenosis

Answer

Transposition of Great Arteries

Answer

Aortic Stenosis

Question 3

A left-sided cardiac bulge seen on chest X-ray is most likely due to which of the following?

Accepted Answer

Enlargement of the left atrial appendage

Answer

Azygos vein enlargement

Answer

Coronary artery aneurysm

Answer

Pulmonary edema

Question 4

Transesophageal echocardiogram (TEE) is superior to transthoracic echocardiogram (TTE) because of which of the following advantages?

Accepted Answer

Higher sensitivity in detecting atheromatous plaques in the ascending thoracic aorta

Answer

Convenience

Answer

Higher sensitivity in detecting left ventricular apical thrombus

Answer

Higher sensitivity in detecting atrial appendage thrombus

Question 5

What is the procedure of choice for the evaluation of an aortic aneurysm?

Accepted Answer

Computed Tomography (CT)

Answer

Ultrasound (USG)

Answer

Magnetic Resonance Imaging (MRI)

Answer

Angiography

Question 6

Which of the following statements is TRUE about Coronary Calcium Scoring, EXCEPT?

Accepted Answer

It requires the administration of iodinated contrast.

Answer

It is done with the help of a CT scan machine.

Answer

A score greater than 400 indicates a very high risk of ischemic heart disease.

Answer

The radiation dose is approximately 1-2 mSv.

Question 7

Which of the following is NOT a radiological sign of coarctation of the aorta?

Accepted Answer

'Egg on side' appearance

Answer

Rib notching

Answer

'E' sign

Answer

Normal shaped heart

Question 8

Which is the most accurate investigation for assessing left ventricular global systolic function?

Accepted Answer

MRI

Answer

Multislice CT

Answer

Nuclear scan

Answer

Echocardiography

Question 9

Hilar dance is seen in fluoroscopy of which condition?

Accepted Answer

Patent ductus arteriosus

Answer

Aortic stenosis

Answer

Coarctation of aorta

Answer

Mitral stenosis

Question 10

A preterm neonate presents for follow-up with a systolic murmur, tachypnea, and hepatomegaly. Further history reveals the mother had an episode of fever with rash during the antenatal period. If CECT were performed, which of the following marked areas would represent a probable pathology in this neonate?

Accepted Answer

Area 3

Answer

Area 1

Answer

Area 2

Answer

Area 4

Cardiovascular Radiology — MCQs

Cardiovascular Radiology — MCQs

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