Chest Radiology Practice Questions

Q: What is the best position for a chest X-ray to detect a minimal right pleural effusion?

Right lateral decubitus. **Explanation:** The detection of pleural effusion on a chest X-ray depends on the volume of fluid and the patient's position relative to gravity. **Why Right Lateral Decubitus is Correct:** In the lateral decubitus position, the patient lies on their side. Gravity causes free-flowing pleural fluid to accumulate along the dependent chest wall. This creates a linear opacity between the inner rib cage and the lung parenchyma. The **Right Lateral Decubitus** is the most sensitive projection for a **right-sided** effusion because it allows even minimal amounts of fluid (as little as **5–10 mL**) to be visualized. **Analysis of Incorrect Options:** * **Erect (PA/AP):** This is the standard screening view. However, it requires at least **175–200 mL** of fluid to cause "blunting" of the costophrenic angle. It is not sensitive enough for "minimal" effusions. * **Supine:** In a supine patient, fluid layers posteriorly. This results in a vague, ground-glass opacification (veiling) of the entire hemithorax rather than a distinct fluid level, making it very difficult to quantify small amounts. * **Left Lateral Decubitus:** This position would be used to detect a minimal *left-sided* effusion. For a right-sided effusion, the fluid would move toward the mediastinum, making it harder to see. **NEET-PG High-Yield Pearls:** * **Sensitivity Hierarchy:** Lateral Decubitus (5-10 mL) > Lateral View (75 mL) > Erect PA View (175-200 mL). * **USG Chest:** The gold standard for bedside detection and localization; it can detect as little as **3–5 mL** of fluid. * **Loculated Effusion:** If fluid does not shift on a decubitus film, it suggests the effusion is loculated (common in empyema). * **Ellis S-shaped curve:** The characteristic upper border of a large pleural effusion seen on an erect X-ray.

Q: Air bronchogram in a chest X-ray is found in all of the following conditions except?

Pleural effusion. ### Explanation An **Air Bronchogram** occurs when air-filled bronchi (dark) become visible against a background of opacified, fluid-filled, or collapsed alveoli (white). For this sign to be present, the conducting airways must remain patent (open) while the surrounding lung parenchyma loses its aeration. **Why Pleural Effusion is the Correct Answer:** In **Pleural Effusion**, fluid accumulates in the pleural space, *outside* the lung. This fluid compresses the lung tissue (passive atelectasis), leading to the collapse of both the alveoli and the bronchi. Since the bronchi are no longer air-filled, they cannot provide the necessary contrast to create an air bronchogram. **Analysis of Incorrect Options:** * **Consolidation (e.g., Pneumonia):** This is the classic cause. Alveoli are filled with inflammatory exudate, but the bronchi remain patent, making them clearly visible. * **Pulmonary Edema:** In the alveolar stage of edema, fluid fills the air sacs while the bronchial tree remains open, often creating a "bat-wing" appearance with air bronchograms. * **Alveolar Cell Carcinoma (Adenocarcinoma in situ):** This tumor grows along the alveolar walls (lepidic growth) without destroying the underlying lung architecture or obstructing the bronchi, frequently presenting as a persistent consolidation with air bronchograms. **NEET-PG High-Yield Pearls:** * **The "Golden S Sign":** Seen in obstructive collapse (e.g., bronchogenic carcinoma) where a bronchus is blocked; air bronchograms are **absent** here. * **Non-obstructive Atelectasis:** Air bronchograms can be seen in compression or cicatrization atelectasis. * **Common Causes:** Pneumonia (most common), Hyaline Membrane Disease (RDS in neonates), and Pulmonary Infarction.

Q: A 50-year-old chronic smoker presents with a chief complaint of hemoptysis and a mass in the wall of the right main bronchus causing tapered narrowing and irregular stenosis. Which of the following CT scans would you advise next?

CT Adrenals. ### Explanation **Correct Option: A. CT Adrenals** The clinical presentation of a chronic smoker with hemoptysis and a mass causing irregular stenosis of the bronchus is highly suggestive of **Bronchogenic Carcinoma**. In the context of lung cancer staging, the **adrenal glands** are the most common site of extrathoracic distant metastasis. According to the TNM staging system, identifying distant metastasis (M1) is crucial for determining resectability and prognosis. Since the adrenals are frequently involved (often asymptomatic), a CT of the upper abdomen (specifically targeting the adrenals) is routinely performed alongside the chest CT during the initial staging workup of lung cancer. **Why other options are incorrect:** * **B & C (CT Pancreas/Kidneys):** While lung cancer can metastasize to these organs, they are significantly less common sites compared to the adrenals, liver, bone, and brain. They are not the primary focus of initial staging unless specific symptoms are present. * **D (Repeat CT Thorax):** Repeating the same scan is redundant. The diagnosis of a bronchial mass has already been established; the next logical step is to stage the disease to plan management (Surgery vs. Chemo-radiation). --- ### Clinical Pearls for NEET-PG * **Most common site of metastasis from Lung Cancer:** Adrenals (often bilateral). * **Most common site of metastasis TO the Lung:** Kidney (RCC - "Cannonball metastasis"). * **Pancoast Tumor:** A superior sulcus tumor often associated with Horner’s Syndrome and erosion of the 1st/2nd ribs. * **Squamous Cell Carcinoma:** Typically central, associated with smoking and cavitary lesions. * **Adenocarcinoma:** Most common type in non-smokers and females; typically peripheral.

Q: Which of the following is NOT a cavitating lesion in the lung?

Hamartoma. **Explanation:** The correct answer is **Hamartoma**. In pulmonary imaging, a cavity is defined as a gas-filled space within a pulmonary consolidation, mass, or nodule. [1] **1. Why Hamartoma is the correct answer:** A pulmonary hamartoma is the most common **benign** lung tumor. It typically presents as a well-defined, solid peripheral nodule. [1] Its hallmark radiological feature is **"popcorn calcification"** (seen in about 10-30% of cases) and the presence of fat densities on CT scan. It is a solid lesion and does **not** undergo central necrosis or cavitation. **2. Analysis of incorrect options:** * **Caplan’s Syndrome:** This is the combination of Rheumatoid Arthritis and Coal Worker’s Pneumoconiosis. It presents with multiple necrobiotic nodules (0.5–5 cm) in the periphery of the lung which **frequently cavitate**. [2] * **Wegener’s Granulomatosis (GPA):** This small-vessel vasculitis commonly presents with multiple bilateral pulmonary nodules. Approximately **50% of these nodules cavitate**, often with thick, irregular walls. * **Squamous Cell Carcinoma (SCC):** Among bronchogenic carcinomas, SCC is the **most common to cavitate** (occurring in ~10-15% of cases) due to rapid growth leading to central ischemic necrosis. [3] **High-Yield Clinical Pearls for NEET-PG:** * **Mnemonic for Cavitating Lung Lesions (CAVITY):** **C**ancer (Squamous cell), **A**utoimmune (Wegener’s, RA/Caplan’s), **V**ascular (Septic emboli), **I**nfection (TB, Abscess, Fungal/Aspergilloma), **T**rauma, **Y**outh (CPAM/Sequestration). [3] * **Thin-walled cavities** are often seen in Coccidioidomycosis or PJP (pneumatoceles). * **Thick-walled, irregular cavities** are highly suggestive of malignancy (SCC).

Q: Eggshell calcification is unlikely in which of the following conditions?

Castleman disease. **Explanation:** **Eggshell calcification** refers to a characteristic radiological pattern where thin, peripheral calcification occurs in the rim of hilar or mediastinal lymph nodes. **Why Castleman Disease is the correct answer:** While Castleman disease (angiofollicular lymph node hyperplasia) is a lymphoproliferative disorder that causes significant lymphadenopathy, it typically presents with **central, coarse, or "popcorn-like" calcification** rather than peripheral eggshell calcification. It is also known for intense contrast enhancement on CT due to its hypervascular nature. **Analysis of Incorrect Options:** * **Silicosis:** This is the most classic and common cause of eggshell calcification (occurring in ~5% of cases). It results from the inhalation of silica particles, leading to fibrotic nodules. * **Coal Worker’s Pneumoconiosis (CWP):** Similar to silicosis, CWP can lead to progressive massive fibrosis and peripheral calcification of the lymph nodes. * **Scleroderma (Systemic Sclerosis):** Though less common than in pneumoconiosis, eggshell calcification can be seen in the mediastinal nodes of patients with scleroderma, even in the absence of silicosis. **NEET-PG High-Yield Pearls:** * **Mnemonic for Eggshell Calcification:** **"S-C-A-R-E"** * **S:** Silicosis (Most common), Sarcoidosis (5%) * **C:** Coal Worker's Pneumoconiosis * **A:** Amyloidosis * **R:** Radiation therapy (e.g., treated Hodgkin Lymphoma) * **E:** Ex-infectious (Histoplasmosis, Blastomycosis) or Rare causes like Scleroderma. * **Key Distinction:** If a question mentions "Eggshell calcification + Upper lobe nodules," think **Silicosis**. If it mentions "Eggshell calcification + Bilateral hilar lymphadenopathy + Non-caseating granulomas," think **Sarcoidosis**.

Q: What is the characteristic radiological finding in sarcoidosis?

Bilateral hilar lymphadenopathy. **Explanation:** **Sarcoidosis** is a multisystem granulomatous disease of unknown etiology characterized by non-caseating granulomas. The most common and characteristic radiological presentation (seen in approximately 90% of patients) is **Bilateral Hilar Lymphadenopathy (BHL)**. 1. **Why BHL is correct:** In Sarcoidosis, the lymphadenopathy is typically symmetrical and involves both the hilar and paratracheal nodes (often forming the "1-2-3 sign" or Garland’s triad). On a PA chest X-ray, this appears as well-defined, lobulated masses at the hila. 2. **Why other options are incorrect:** * **Parenchymal disease:** While it occurs in later stages (Stage II-IV), it is not as "characteristic" or early a finding as BHL. * **Unilateral hilar lymphadenopathy:** This is rare in sarcoidosis and should prompt a search for alternative diagnoses like Tuberculosis, Lymphoma, or Malignancy. * **Miliary shadow:** This is the hallmark of Miliary Tuberculosis. While sarcoidosis can present with a micronodular pattern, it is usually distributed along the bronchovascular bundles (perilymphatic distribution), unlike the random distribution of miliary TB. **High-Yield Clinical Pearls for NEET-PG:** * **Scadding’s Staging of Sarcoidosis:** * Stage 0: Normal CXR. * Stage I: BHL alone (Best prognosis). * Stage II: BHL + Parenchymal infiltrates. * Stage III: Parenchymal infiltrates alone. * Stage IV: Pulmonary Fibrosis (Honeycombing). * **Panda Sign & Gallium-67 Scan:** Increased uptake in parotid, lacrimal glands, and hila. * **Eggshell Calcification:** Seen in hilar nodes (also seen in Silicosis). * **Kveim Test:** Historically used skin test (now largely replaced by biopsy).

Q: A 40-year-old man has a routine chest X-ray which reveals a posterior mediastinal mass. Which of the following is the most likely diagnosis?

Neurogenic tumor. ### Explanation The mediastinum is traditionally divided into anterior, middle, and posterior compartments. The **posterior mediastinum** is defined as the space between the pericardium/trachea anteriorly and the vertebral column posteriorly (the paravertebral sulcus). **1. Why Neurogenic Tumor is Correct:** Neurogenic tumors are the **most common cause of a posterior mediastinal mass**, accounting for approximately 75% of masses in this compartment. They arise from peripheral nerves (Schwannoma, Neurofibroma), sympathetic ganglia (Ganglioneuroma, Neuroblastoma), or paraganglionic tissue. On imaging, they typically appear as well-circumscribed, rounded masses in the paravertebral area and may cause "scalloping" of the vertebral bodies or widening of the intervertebral foramina (the "dumbbell" sign). **2. Why Other Options are Incorrect:** * **Lipoma:** While lipomas can occur anywhere, they are rare in the mediastinum and more commonly found in the anterior compartment (cardiophrenic angles). * **Esophageal Cyst:** These are duplication cysts. While they are located in the posterior mediastinum, they are significantly less common than neurogenic tumors. * **Fibroma:** These are rare mesenchymal tumors and do not represent a primary diagnostic consideration for a posterior mediastinal mass. **3. High-Yield Clinical Pearls for NEET-PG:** * **Anterior Mediastinum (The 4 Ts):** Thymoma (most common), Thyroid (Retrosternal goiter), Teratoma (Germ cell tumors), and "Terrible" Lymphoma. * **Middle Mediastinum:** Most common causes are Lymphadenopathy (Sarcoid, TB, Malignancy) and Bronchogenic cysts. * **Posterior Mediastinum:** Neurogenic tumors are the hallmark. * **Imaging Sign:** The **Cervicothoracic Sign** helps differentiate masses; if the cephalad border of a mass is visible above the clavicles, it is located in the posterior mediastinum.

Q: What is the best imaging modality to assess the position and integrity of an implantable cardioverter-defibrillator (ICD)?

Plain radiograph. **Explanation:** The **Plain Radiograph (Chest X-ray)** is the gold standard and first-line imaging modality for assessing the position and integrity of an Implantable Cardioverter-Defibrillator (ICD). **Why it is correct:** Chest X-rays (PA and Lateral views) provide high spatial resolution for visualizing metallic components. They allow clinicians to: 1. **Verify Position:** Confirm the generator site and lead tip placement (e.g., right ventricle). 2. **Assess Integrity:** Detect lead fractures, insulation breaks, or dislodgement. 3. **Identify "Twiddler’s Syndrome":** Where the patient manipulates the generator, causing leads to coil and displace. 4. **Identify Device Models:** The radiopaque "X-ray ID" code on the generator can be read on a plain film. **Why other options are incorrect:** * **CT Scan:** While it provides 3D detail, the high-density metal of the ICD causes significant **"streak artifacts,"** which obscure the leads and surrounding anatomy, making it inferior for assessing lead integrity. * **MRI:** Most modern ICDs are "MRI-conditional," but MRI is never the *first* or *best* tool for checking lead integrity. Furthermore, the magnetic field can cause heating of the leads or device malfunction. * **PET Scan:** This is a functional imaging modality used for detecting metabolic activity (e.g., infection or malignancy) and has no role in assessing the mechanical integrity of hardware. **High-Yield Clinical Pearls for NEET-PG:** * **ICD vs. Pacemaker:** On X-ray, ICD leads are distinguished by the presence of one or two thick, radiopaque **shocking coils**. * **Golden Rule:** Always obtain two views (PA and Lateral) to ensure the lead is not displaced posteriorly or anteriorly. * **Complication:** Pneumothorax is the most common acute complication post-insertion, also best diagnosed via Chest X-ray.

Q: Obliteration of the costophrenic angle is seen in which condition?

Pleural effusion. **Explanation:** The **costophrenic angle** is the junction between the ribs and the diaphragm. In a healthy individual, this angle is sharp and clearly defined on a chest X-ray. **Why Pleural Effusion is correct:** Pleural effusion is the accumulation of fluid in the pleural space. Due to gravity, fluid first collects in the most dependent parts of the thoracic cavity. On an upright chest X-ray, this fluid fills the costophrenic sulcus, leading to the **"blunting" or obliteration** of the costophrenic angle. This is often accompanied by a concave upper border known as the **Ellis-Damoiseau line (Meniscus sign)**. **Analysis of Incorrect Options:** * **Pneumothorax:** This is the presence of air in the pleural space. Instead of blunting, it typically results in a **deep sulcus sign** (an abnormally deepened and lucent costophrenic angle) on a supine film, or a visible visceral pleural line with peripheral lucency. * **Tuberculosis:** While TB can cause an effusion, it is a broad disease. The primary radiological features are usually apical infiltrates, cavitation, or hilar lymphadenopathy. Obliteration specifically refers to the fluid effect, not the infection itself. * **Pneumonia:** This presents as **consolidation** (airspace opacification with air bronchograms). Unless complicated by a parapneumonic effusion, pneumonia does not typically obliterate the costophrenic angle. **High-Yield NEET-PG Pearls:** * **Sensitivity:** A minimum of **175–200 mL** of fluid is required to blunt the lateral costophrenic angle on a PA view. * **Lateral View:** The posterior costophrenic angle is the most dependent; blunting here can be seen with as little as **50–75 mL** of fluid. * **USG:** Ultrasound is more sensitive than X-ray and can detect as little as **5–10 mL** of pleural fluid.

Question 1

What is the best position for a chest X-ray to detect a minimal right pleural effusion?

Accepted Answer

Right lateral decubitus

Answer

Erect

Answer

Supine

Answer

Left lateral decubitus

Question 2

Air bronchogram in a chest X-ray is found in all of the following conditions except?

Accepted Answer

Pleural effusion

Answer

Consolidation

Answer

Pulmonary edema

Answer

Alveolar cell carcinoma

Question 3

A 50-year-old chronic smoker presents with a chief complaint of hemoptysis and a mass in the wall of the right main bronchus causing tapered narrowing and irregular stenosis. Which of the following CT scans would you advise next?

Accepted Answer

CT Adrenals

Answer

CT Pancreas

Answer

CT Kidneys

Answer

Repeat CT Thorax

Question 4

Which of the following is NOT a cavitating lesion in the lung?

Accepted Answer

Hamartoma

Answer

Caplan's syndrome

Answer

Wegener's granulomatosis

Answer

Squamous cell carcinoma

Question 5

Eggshell calcification is unlikely in which of the following conditions?

Accepted Answer

Castleman disease

Answer

Silicosis

Answer

Coal worker's pneumoconiosis

Answer

Scleroderma

Question 6

What is the characteristic radiological finding in sarcoidosis?

Accepted Answer

Bilateral hilar lymphadenopathy

Answer

Parenchymal disease

Answer

Unilateral hilar lymphadenopathy

Answer

Miliary shadow

Question 7

Increased radiolucency of one hemithorax may be caused by all of the following except?

Accepted Answer

Expiratory film

Answer

Obstructive emphysema

Answer

Pneumothorax

Answer

Patient rotation

Question 8

A 40-year-old man has a routine chest X-ray which reveals a posterior mediastinal mass. Which of the following is the most likely diagnosis?

Accepted Answer

Neurogenic tumor

Answer

Lipoma

Answer

Esophageal cyst

Answer

Fibroma

Question 9

What is the best imaging modality to assess the position and integrity of an implantable cardioverter-defibrillator (ICD)?

Accepted Answer

Plain radiograph

Answer

CT scan

Answer

MRI

Answer

PET scan

Question 10

Obliteration of the costophrenic angle is seen in which condition?

Accepted Answer

Pleural effusion

Answer

Pneumothorax

Answer

Tuberculosis

Answer

Pneumonia

Chest Radiology — MCQs

Chest Radiology — MCQs

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