Cardiovascular Radiology Practice Questions

Q: What is the test of choice to detect perivalvular abscesses?

Transesophageal echocardiography (TEE) with color Doppler. ### Explanation **1. Why Transesophageal Echocardiography (TEE) is the Correct Answer:** In the context of Infective Endocarditis (IE), a perivalvular abscess is a serious complication indicating the spread of infection beyond the valve leaflets. **TEE is the gold standard** for detecting these abscesses because the esophagus lies directly behind the heart, providing a high-resolution window without interference from the lungs or chest wall. The addition of **Color Doppler** is crucial as it helps identify "fistulous tracts" or turbulent flow within the abscess cavity, significantly increasing sensitivity (up to 90% compared to <30% for TTE). **2. Why Other Options are Incorrect:** * **2D-Echocardiography (Transthoracic/TTE):** While TTE is the initial screening tool for IE, it has poor sensitivity for perivalvular extensions, especially in patients with prosthetic valves or obesity, due to acoustic shadowing. * **CT Scan:** Cardiac CT is excellent for visualizing coronary anatomy and can detect abscesses, but it lacks the real-time hemodynamic assessment (blood flow velocity) provided by Doppler. It is usually a secondary choice when TEE is contraindicated. * **MRI:** Although MRI provides detailed anatomical images, it is rarely used in acute settings due to long acquisition times, difficulty in monitoring unstable patients, and artifacts caused by metallic prosthetic valves. **3. High-Yield Clinical Pearls for NEET-PG:** * **Duke’s Criteria:** Remember that "Echocardiogram positive for IE" (including abscess or new valvular regurgitation) is a **Major Criterion**. * **Prosthetic Valves:** TEE is mandatory if a prosthetic valve infection is suspected, as TTE is almost always non-diagnostic due to shadowing. * **Most Common Site:** Perivalvular abscesses are most frequently associated with the **Aortic valve** (often presenting as a new conduction block/prolonged PR interval on ECG).

Q: All are features of Kerley A lines except?

Located at the base of the lungs. **Explanation:** The question asks for the feature that is **NOT** characteristic of Kerley A lines. Kerley lines represent thickened interlobular septa, typically due to pulmonary venous hypertension (e.g., Congestive Heart Failure). **Why Option C is the correct answer (The "Except"):** Kerley A lines are characteristically found in the **upper and mid-zones** of the lungs, radiating from the hila. They are longer (2–6 cm) and thinner than Kerley B lines. It is **Kerley B lines** that are located at the **lung bases** (periphery/costophrenic angles). **Analysis of Incorrect Options:** * **Option A & B:** These describe the pathophysiology. Kerley lines occur when the **interlobular septa** become prominent due to **lymphatic engorgement** and interstitial **edema**. This happens when pulmonary capillary wedge pressure (PCWP) exceeds 15–20 mmHg. * **Option D:** **Congestive Heart Failure (CHF)** is the most common cause of Kerley lines. As fluid backs up into the pulmonary circulation, it leaks into the interstitium, making these septa visible on a chest X-ray. **NEET-PG High-Yield Pearls:** * **Kerley A:** Long (up to 6cm), radiate from hila to the mid/upper zones. Represent distended anastomotic lymphatics. * **Kerley B:** Short (1–2cm), horizontal, located at the **bases** and periphery. These are the most common type seen clinically. * **Kerley C:** Reticular/spider-web appearance at the bases (represents Kerley B lines seen end-on). * **PCWP Correlation:** * 12–18 mmHg: Cephalization (Upper lobe diversion). * 18–25 mmHg: Kerley lines (Interstitial edema). * >25 mmHg: Bat-wing appearance (Alveolar edema).

Q: Judkins technique is used for which procedure?

Coronary arteriography. **Explanation:** The **Judkins technique** is the most widely used method for **coronary arteriography** (diagnostic cardiac catheterization). It involves a percutaneous approach, typically through the femoral artery (Seldinger technique), using pre-shaped, specialized catheters designed to selectively engage the ostia of the right and left coronary arteries. * **Why Option B is correct:** The Judkins technique utilizes specific catheters—the **Judkins Left (JL)** and **Judkins Right (JR)**—which have secondary curves tailored to the anatomy of the aortic arch and the location of the coronary ostia, allowing for rapid and safe opacification of the coronary arteries. * **Why Options A & D are incorrect:** Central venous line placement and chest tube insertion are bedside procedures that do not require specialized arterial catheters or fluoroscopic guidance for coronary engagement. * **Why Option C is incorrect:** While renal angiography also uses a percutaneous arterial approach, it typically employs different catheter shapes (e.g., Cobra or RDC catheters) specifically designed for the renal artery anatomy. **High-Yield Pearls for NEET-PG:** * **Sones Technique:** An older alternative to Judkins that uses a single catheter via a brachial artery cut-down. * **Radial Approach:** Currently gaining preference over the femoral (Judkins) approach due to lower bleeding complications, often using **Tiger or Jacky catheters** which can cannulate both coronaries with one catheter. * **Gold Standard:** Coronary angiography remains the gold standard for diagnosing Coronary Artery Disease (CAD). * **Contrast Media:** Non-ionic, low-osmolar contrast media (LOCM) are preferred to reduce the risk of nephropathy and arrhythmias.

Q: Left atrial hypertrophy is seen radiologically as:

All of the above. **Explanation:** Left Atrial Enlargement (LAE) – often referred to as hypertrophy in clinical scenarios – manifests through specific radiological signs due to the left atrium's posterior and midline position in the mediastinum. * **Double Cardiac Silhouette (Double Density Sign):** As the left atrium enlarges, its right border extends toward the right, overlapping the normal right atrial shadow. This creates a "double contour" or "double density" visible on a PA chest X-ray. * **Left Bronchial Elevation:** The left atrium lies directly beneath the bifurcation of the trachea (carina). When it enlarges superiorly, it pushes the left main bronchus upward, widening the subcarinal angle (normally $<75^\circ$) and creating the "walking man" sign on lateral views. * **Barium Swallow (RAO View):** Because the left atrium is the most posterior chamber, its enlargement causes posterior displacement and indentation of the esophagus. This is best visualized during a barium swallow in the Right Anterior Oblique (RAO) or lateral position. **Why "All of the above" is correct:** Each option describes a classic radiological sign resulting from the anatomical expansion of the left atrium in different planes (Rightward, Superior, and Posterior). **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause:** Mitral Stenosis (MS). * **Straightening of the left cardiac border:** The earliest sign of LAE, caused by the prominence of the left atrial appendage. * **Carinal Angle:** An angle $>90^\circ$ is highly suggestive of LAE. * **Hoffman-Rigler Sign:** Used to identify Left Ventricular Enlargement (not LAE) on a lateral film. * **Giant Left Atrium:** Defined when the left atrium touches the right lateral chest wall.

Q: What is the best investigation for diagnosing an abdominal aortic aneurysm?

CT angiography. **Explanation:** **CT Angiography (CTA)** is the gold standard for diagnosing and pre-operative planning of an Abdominal Aortic Aneurysm (AAA). While ultrasound is excellent for screening, CTA provides precise anatomical detail, including the exact diameter, longitudinal extent, involvement of visceral branches (renal, mesenteric), and the presence of mural thrombus or calcification. This information is critical for determining whether a patient is a candidate for EVAR (Endovascular Aneurysm Repair) or open surgery. **Analysis of Options:** * **Ultrasound (USG):** This is the **investigation of choice for screening** and longitudinal monitoring of small aneurysms due to its non-invasive nature and lack of radiation. However, it is operator-dependent and limited by bowel gas or obesity, making it less definitive than CTA for surgical planning. * **Classical Radiography:** X-rays may incidentally show a "eggshell calcification" of the aortic wall, but they lack the sensitivity and specificity required for diagnosis or measurement. * **Non-contrast CT scan:** While it can detect the presence of an aneurysm and mural calcification, it cannot accurately assess the lumen, flow, or the relationship with arterial branches, which are essential for management. **Clinical Pearls for NEET-PG:** * **Screening tool of choice:** Ultrasound. * **Best/Gold Standard investigation:** CT Angiography. * **Definition of AAA:** Permanent dilation of the abdominal aorta >3 cm or >1.5 times its normal diameter. * **Most common site:** Infra-renal (90%). * **Surgical indication:** Diameter >5.5 cm in men or >5.0 cm in women, or rapid expansion (>0.5 cm in 6 months).

Q: What is the radiological sign of coarctation of aorta?

All of the above. **Explanation:** Coarctation of the aorta is a congenital narrowing of the aortic lumen, typically occurring near the ductus arteriosus. The radiological signs are a result of the anatomical narrowing and the subsequent development of collateral circulation. * **Option A: Dock’s Sign:** This refers to **rib notching**, typically seen on the inferior margins of the 3rd to 8th ribs. It is caused by the pressure erosion of the ribs by dilated, tortuous intercostal arteries acting as collateral pathways to bypass the obstruction. * **Option B & C: E sign and Inverted 3 sign:** These are two sides of the same coin. On a **Barium Swallow**, the dilated pre-stenotic aorta, the site of coarctation, and the post-stenotic dilatation indent the esophagus, forming an **"E sign."** On a **Plain Chest X-ray**, these same contours form the **"Figure of 3" sign** along the left mediastinal border. When viewed on an esophagogram, this "3" appears mirrored, hence the term **"Inverted 3 sign."** **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 (proximal to the coarctation). * **Association:** Strongly associated with **Turner Syndrome** (15-20% of cases) and **Bicuspid Aortic Valve** (most common cardiac association, ~50-80%). * **Clinical Finding:** Classic "radio-femoral delay" and upper limb hypertension with lower limb hypotension.

Q: X-ray features of Atrial Septal Defect (ASD) are all except:

Left atrial enlargement. In **Atrial Septal Defect (ASD)**, the underlying pathophysiology is a left-to-right shunt at the atrial level. This leads to volume overload of the right-sided chambers and the pulmonary circulation. ### Why "Left Atrial Enlargement" is the Correct Answer: In ASD, the left atrium (LA) does not enlarge because it decompresses itself into the right atrium through the defect. Even though there is increased pulmonary venous return to the LA, the blood immediately shunts across the ASD. Therefore, **LA enlargement is characteristically absent** in ASD. If LA enlargement is seen on an X-ray in a patient with a left-to-right shunt, it points toward a Ventricular Septal Defect (VSD) or Patent Ductus Arteriosus (PDA). ### Explanation of Other Options: * **Right Atrial Enlargement:** The right atrium receives both the systemic venous return and the shunted blood from the LA, leading to dilation. * **Pulmonary Artery Hypertension (PAH):** Increased pulmonary blood flow (plethora) eventually leads to increased pulmonary vascular resistance. On X-ray, this manifests as a prominent pulmonary conus and "hilar dance" on fluoroscopy. * **Small Aortic Knuckle:** Due to the left-to-right shunt, the stroke volume entering the left ventricle and the aorta is relatively reduced compared to the massive pulmonary flow, making the aortic knob appear small or inconspicuous. ### High-Yield Clinical Pearls for NEET-PG: * **X-ray Triad of ASD:** Enlarged RA, Enlarged RV, and Pulmonary Plethora with a small Aortic Knuckle. * **Auscultation:** Wide, fixed split S2 (pathognomonic). * **ECG:** RSR' pattern in V1 (Partial RBBB) and Right Axis Deviation (in Ostium Secundum, the most common type). * **Lutembacher Syndrome:** ASD associated with Mitral Stenosis.

Question 1

Inferior rib notching is seen in all of the following conditions except:

Accepted Answer

Pulmonary stenosis with ventricular septal defect

Answer

Blalock Taussig shunt operation

Answer

Coarctation of the aorta

Answer

Interrupted aortic arch

Question 2

What is the test of choice to detect perivalvular abscesses?

Accepted Answer

Transesophageal echocardiography (TEE) with color Doppler

Answer

MRI

Answer

CT scan

Answer

2D-echocardiography

Question 3

The 'Oreo cookie sign' is a radiological finding suggestive of which of the following conditions?

Accepted Answer

Pericardial effusion

Answer

Aberrant subclavian artery

Answer

Left atrium enlargement

Answer

Endomyocardial fibrosis

Question 4

All are features of Kerley A lines except?

Accepted Answer

Located at the base of the lungs

Answer

Prominent Interlobular Septa

Answer

Due to lymphatic engorgement and edema of septa

Answer

Seen in Congestive Heart Failure

Question 5

Judkins technique is used for which procedure?

Accepted Answer

Coronary arteriography

Answer

Central venous line placement

Answer

Renal angiography

Answer

Chest tube insertion

Question 6

Left atrial hypertrophy is seen radiologically as:

Accepted Answer

All of the above

Answer

Double cardiac silhouette

Answer

Left bronchial elevation

Answer

Right anterior oblique view in barium swallow

Question 7

What is the best investigation for diagnosing an abdominal aortic aneurysm?

Accepted Answer

CT angiography

Answer

Ultrasound (USG)

Answer

Classical radiography

Answer

Non-contrast CT scan

Question 8

What is the radiological sign of coarctation of aorta?

Accepted Answer

All of the above

Answer

Dock's sign

Answer

E sign

Answer

Inverted 3 sign

Question 9

X-ray features of Atrial Septal Defect (ASD) are all except:

Accepted Answer

Left atrial enlargement

Answer

Right atrial enlargement

Answer

Pulmonary artery hypertension

Answer

Small aortic knuckle

Question 10

What is the best investigation for cardiac tamponade?

Accepted Answer

2-D Echocardiography

Answer

M-Mode Echocardiography

Answer

Real-time Echocardiography

Answer

Ultrasonography (USG)

Cardiovascular Radiology — MCQs

Cardiovascular Radiology — MCQs

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