Pulmonology Practice Questions

Q: What is the characteristic radiological finding in sarcoidosis?

Bilateral hilar lymphadenopathy. **Explanation:** **Bilateral Hilar Lymphadenopathy (BHL)** is the hallmark radiological feature of Sarcoidosis, seen in approximately 90% of patients at some point during the disease course. Sarcoidosis is a multisystem, non-caseating granulomatous disease of unknown etiology. The classic "Garland triad" (or 1-2-3 sign) on a chest X-ray consists of right paratracheal, right hilar, and left hilar lymphadenopathy. **Analysis of Options:** * **Bilateral Hilar Lymphadenopathy (Correct):** This is the most common presentation (Stage I Scadding Criteria). It is typically symmetrical and asymptomatic [1]. * **Parenchymal disease (Incorrect):** While parenchymal involvement (reticulonodular opacities) occurs in Stage II and III, it is usually preceded by or associated with BHL. It is not as "characteristic" or specific as BHL. * **Unilateral hilar lymphadenopathy (Incorrect):** This is rare in sarcoidosis (<5%). Unilateral involvement should raise suspicion for malignancy (lymphoma or bronchogenic carcinoma) or infections like Tuberculosis. * **Miliary shadow (Incorrect):** This is the classic radiological finding for Miliary Tuberculosis or certain fungal infections, not sarcoidosis. **High-Yield Clinical Pearls for NEET-PG:** * **Scadding Stages:** * Stage I: BHL only. * Stage II: BHL + Parenchymal infiltrates. * Stage III: Parenchymal infiltrates only. * Stage IV: Pulmonary Fibrosis (honeycombing). * **Löfgren Syndrome:** A classic acute presentation of sarcoidosis featuring the triad of **BHL, Erythema Nodosum, and Polyarthritis/Arthralgia** [1]. * **Panda Sign & Gallium-67 Scan:** Increased uptake in parotid and lacrimal glands (Panda sign) and hilar nodes (Lambda sign) are characteristic nuclear imaging findings.

Q: Superior vena cava (SVC) syndrome is most commonly associated with which of the following conditions?

Lung cancer. Superior Vena Cava (SVC) syndrome results from the physical obstruction of blood flow through the SVC, leading to facial edema, venous distention in the neck, and upper extremity swelling. **1. Why Lung Cancer is Correct:** Historically, infections like syphilis and tuberculosis were the leading causes. However, in modern clinical practice, **malignancy** accounts for approximately 60–90% of cases. Among these, **Lung Cancer** is the most common cause (approx. 75%), with **Small Cell Lung Cancer (SCLC)** being the most frequent histological subtype associated with SVC syndrome due to its central location and rapid growth. Non-Small Cell Lung Cancer (NSCLC), particularly squamous cell carcinoma, is also a significant contributor [1]. **2. Analysis of Incorrect Options:** * **Lymphoma (Option B):** This is the second most common malignant cause (approx. 10–15%), particularly Non-Hodgkin Lymphoma. While significant, it is statistically less frequent than lung cancer. * **Mediastinal Fibrosis (Option A):** This is a rare non-malignant cause, often associated with Histoplasmosis or idiopathic causes. * **Tuberculous Mediastinitis (Option D):** While a common cause of SVC syndrome in developing countries like India in the past, malignancy has now overtaken infectious etiologies in the overall clinical data. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause overall:** Lung Cancer (specifically Small Cell Lung Cancer) [1]. * **Most common non-malignant cause:** Iatrogenic (thrombosis due to indwelling central venous catheters or pacemakers). * **Pemberton’s Sign:** Facial flushing and respiratory distress upon raising both arms; a classic clinical sign of SVC obstruction (often seen in retrosternal goiters). * **Management:** For SCLC and Lymphoma, chemotherapy/radiotherapy is the mainstay. For NSCLC, stenting is often preferred for rapid palliation.

Q: Caplan's syndrome is defined as:

Rheumatoid Arthritis and Pneumoconiosis. **Explanation:** **Caplan’s Syndrome** (also known as Rheumatoid Pneumoconiosis) is a clinical entity characterized by the coexistence of **Rheumatoid Arthritis (RA)** and **Pneumoconiosis** [1]. It was originally described in coal miners but can occur in patients exposed to various inorganic dusts, including silica and asbestos [1]. 1. **Why Option B is Correct:** The underlying pathophysiology involves an exaggerated inflammatory response. In patients with a rheumatoid diathesis, the inhalation of inorganic dust triggers the formation of multiple, well-defined "Caplan nodules" (0.5 to 5 cm in diameter) in the lungs [1]. These nodules are histologically similar to rheumatoid nodules but have a peripheral zone of inflammation related to dust deposition. 2. **Why Other Options are Incorrect:** * **Options A, C, and D:** These are distractors. **Splenomegaly and Neutropenia** in the context of Rheumatoid Arthritis define **Felty’s Syndrome**, not Caplan’s [2]. Pneumoconiosis is not typically associated with isolated splenomegaly or neutropenia in standard medical nomenclature. **High-Yield Clinical Pearls for NEET-PG:** * **Radiology:** Caplan nodules typically appear rapidly, are bilateral, and are located at the periphery of the lung fields. They may cavitate or calcify. * **Key Association:** It is most commonly associated with **Coal Workers' Pneumoconiosis (CWP)** and **Silicosis** [1]. * **Serology:** Patients are usually Rheumatoid Factor (RF) positive, and the lung nodules may appear *before*, *concurrently with*, or *after* the onset of joint symptoms. * **Differential Diagnosis:** Always differentiate from **Felty’s Syndrome** (RA + Splenomegaly + Neutropenia) and **Erasmus Syndrome** (Systemic Sclerosis + Silicosis).

Q: Which of the following is NOT a feature of lobar pneumonia?

Segmental consolidation. ### Explanation **Lobar pneumonia** is a form of pneumonia characterized by an inflammatory exudate that spreads rapidly through the **pores of Kohn** and **canals of Lambert**. This leads to the involvement of a large portion of a lobe or an entire lobe uniformly. **Why "Segmental Consolidation" is the correct answer:** Segmental consolidation is the hallmark of **Bronchopneumonia**, not lobar pneumonia. In bronchopneumonia, the infection starts in the bronchioles and spreads to the surrounding alveoli, resulting in a patchy, focal distribution that follows the segmental anatomy of the lung. In contrast, lobar pneumonia crosses segmental boundaries to involve the entire lobe homogeneously. **Analysis of Incorrect Options:** * **A. Homogeneous consolidation:** This is a classic radiological feature of lobar pneumonia. The inflammatory process fills all the alveoli within a lobe, creating a uniform density on X-ray. * **B. Air bronchogram sign:** This occurs when the alveoli are filled with fluid/exudate (consolidation) but the conducting airways (bronchi) remain air-filled. It is a characteristic sign of lobar consolidation. * **D. Typical of pneumococcal infection:** *Streptococcus pneumoniae* (Pneumococcus) is the most common cause of community-acquired pneumonia and the classic causative agent of the lobar pattern [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Stages of Lobar Pneumonia:** Congestion → Red Hepatization (liver-like consistency) → Gray Hepatization (fibrinopurulent exudate) → Resolution. * **Rusty Sputum:** Classically associated with *S. pneumoniae* [1]. * **Bulging Fissure Sign:** Often seen in lobar pneumonia caused by *Klebsiella pneumoniae* due to heavy mucoid exudate [1]. * **Physical Findings:** Increased vocal fremitus, dullness on percussion, and bronchial breath sounds over the area of consolidation.

Q: Which of the following statements about pulmonary embolism is false?

Chest pain is the most common symptom.. **Explanation:** The correct answer is **A**, as **dyspnea (shortness of breath)**, not chest pain, is the most common symptom of pulmonary embolism (PE). 1. **Why Option A is False:** According to the PIOPED study and Harrison’s Principles of Internal Medicine, **dyspnea** is the most frequent symptom (occurring in ~73% of cases), followed by pleuritic chest pain (~66%) and cough (~37%). While chest pain is a hallmark sign, it is statistically secondary to the sudden onset of breathlessness. 2. **Why Option B is True:** Approximately 90% of pulmonary emboli originate from **Deep Vein Thrombosis (DVT)** of the lower extremities, specifically the proximal veins (popliteal, femoral, and iliac). 3. **Why Option C is True:** The highest mortality risk in PE occurs within the first few hours of the event (due to right ventricular failure). If a patient survives the initial hemodynamic insult and receives anticoagulation, the prognosis for recovery improves significantly as the body’s endogenous fibrinolytic system begins to dissolve the clot [2]. 4. **Why Option D is True:** In cases of massive PE, acute right heart strain leads to increased central venous pressure, which manifests clinically as **distended neck veins (JVP)** [1]. **NEET-PG High-Yield Pearls:** * **Most common sign:** Tachypnea (Respiratory rate >20/min). * **Gold Standard Investigation:** Computed Tomographic Pulmonary Angiography (CTPA) [3]. * **ECG Finding:** Most common is Sinus Tachycardia; most specific is **S1Q3T3** (indicates right heart strain) [1]. * **CXR Signs:** Westermark sign (focal oligemia) and Hampton’s Hump (wedge-shaped opacity) [1]. * **Initial Screening:** D-Dimer (high negative predictive value).

Q: Which of the following is characteristically not associated with the development of interstitial lung disease?

None of the above. **Explanation:** The correct answer is **D (None of the above)** because all three categories listed—organic dusts, inorganic dusts, and toxic gases—are well-recognized etiologies for the development of Interstitial Lung Disease (ILD). 1. **Organic Dusts (Option A):** Exposure to organic antigens (e.g., bird droppings, moldy hay, thermophilic actinomycetes) leads to **Hypersensitivity Pneumonitis (Extrinsic Allergic Alveolitis)**. If chronic, this inflammatory process progresses to irreversible pulmonary fibrosis, a classic form of ILD. 2. **Inorganic Dusts (Option B):** These cause **Pneumoconioses**. Common examples include Silicosis (silica), Asbestosis (asbestos), and Coal Worker’s Pneumoconiosis (coal dust) [1]. These minerals trigger a chronic fibrotic response in the lung parenchyma. 3. **Toxic Gases (Option C):** Acute or chronic inhalation of gases such as Chlorine, Ammonia, Sulfur dioxide, or Nitrogen dioxide (Silo filler’s disease) can cause direct alveolar injury [4]. This often results in **Bronchiolitis Obliterans** or diffuse interstitial fibrosis during the healing phase. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of ILD:** Idiopathic Pulmonary Fibrosis (IPF). * **Drug-induced ILD:** Always remember **Amiodarone, Methotrexate, and Bleomycin** as high-yield culprits [3]. * **Radiological Hallmark:** "Honeycombing" on HRCT is the classic sign of end-stage interstitial fibrosis [2]. * **PFT Pattern:** ILD typically shows a **Restrictive pattern** (Decreased TLC, Decreased FVC, but a Normal or Increased FEV1/FVC ratio) with a decreased DLCO [2].

Q: What is the most common cause of an amoebic lung abscess?

Direct spread from the liver. **Explanation:** Amoebic lung abscess is almost always a secondary complication of intestinal amoebiasis [1], caused by the protozoan *Entamoeba histolytica*. **Why Option B is Correct:** The most common route of pulmonary involvement is **direct extension (transdiaphragmatic spread)** from an Amoebic Liver Abscess (ALA). Because the liver is situated immediately below the diaphragm, an abscess in the superior surface of the right lobe can cause inflammatory adhesion to the diaphragm [1]. The abscess then ruptures through the diaphragm into the pleural space (causing empyema) or directly into the lung parenchyma, leading to a lung abscess [2]. This typically involves the lower lobe of the right lung. **Why Other Options are Incorrect:** * **Option A (Aspiration):** This is the most common cause of *pyogenic* lung abscesses (usually involving anaerobes), but it is not the mechanism for amoebic infections. * **Option C & D (Hematogenous spread):** While *E. histolytica* can rarely travel via the bloodstream (portal circulation to the liver or systemic circulation to the lungs/brain), this is a significantly less common route for pulmonary involvement compared to direct local extension. **NEET-PG High-Yield Pearls:** * **Sputum Appearance:** Classically described as **"Anchovy sauce"** [1] or "Chocolate" colored sputum. * **Location:** Most common in the **Right Lower Lobe** (due to the proximity of the right lobe of the liver). * **Hepatobronchial Fistula:** If the abscess ruptures into a bronchus, the patient may expectorate large amounts of "anchovy sauce" pus. * **Treatment:** The drug of choice is **Metronidazole** [2] (or Tinidazole), followed by a luminal amoebicide (e.g., Diloxanide furoate) to eradicate the intestinal cyst stage.

Q: Corpulmonale is heart disease due to:

COPD affecting right ventricle. **Explanation:** **Cor Pulmonale** is defined as hypertrophy and/or dilatation of the **right ventricle (RV)** resulting from pulmonary hypertension caused by diseases of the lung parenchyma or pulmonary vasculature [1]. **Why Option A is Correct:** Chronic Obstructive Pulmonary Disease (COPD) is the most common cause of Cor Pulmonale. The underlying mechanism involves chronic alveolar hypoxia, which triggers **hypoxic pulmonary vasoconstriction**. This increases pulmonary vascular resistance, leading to pulmonary hypertension. The right ventricle must pump against this high pressure (increased afterload), eventually leading to RV hypertrophy and right-sided heart failure. **Why Other Options are Incorrect:** * **Option B (Left Ventricular Failure):** While LV failure is the most common cause of right-sided heart failure overall, it is **not** called Cor Pulmonale. By definition, Cor Pulmonale excludes right heart failure resulting from diseases of the left side of the heart or congenital heart disease. * **Option C (Pericardial Effusion):** This involves the accumulation of fluid in the pericardial sac, which can lead to cardiac tamponade. It affects the filling of all heart chambers but is not a primary pulmonary-induced right heart disease. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Diagnosis:** Right heart catheterization (to measure pulmonary artery pressure). * **ECG Findings:** Right axis deviation, P-pulmonale (tall, peaked P waves in lead II), and R/S ratio >1 in V1 [1]. * **Most Common Cause:** COPD (Chronic Bronchitis > Emphysema). * **Acute Cor Pulmonale:** Most commonly caused by massive **Pulmonary Embolism**. * **Management Tip:** Long-term oxygen therapy (LTOT) is the only intervention shown to improve survival in COPD patients with Cor Pulmonale by reducing hypoxic vasoconstriction.

Question 1

What is the characteristic radiological finding in sarcoidosis?

Accepted Answer

Bilateral hilar lymphadenopathy

Answer

Parenchymal disease

Answer

Unilateral hilar lymphadenopathy

Answer

Miliary shadow

Question 2

Pneumatocele is commonly found in which type of pneumonia?

Accepted Answer

Pneumocystis jirovecii pneumonia

Answer

Staphylococcal pneumonia

Answer

Klebsiella pneumonia

Answer

Pseudomonas pneumonia

Question 3

A 40-year-old man without a significant medical history presents with a 3-day history of fever, shaking chills, and a 15-minute episode of rigor. He also reports a cough productive of yellow-green sputum, anorexia, and right-sided pleuritic chest pain. Shortness of breath has been present for the past 12 hours. Chest x-ray reveals a consolidated right middle lobe infiltrate, and CBC shows an elevated neutrophil count with many band forms present. Which feature would most strongly support inpatient admission and IV antibiotic treatment for this patient?

Accepted Answer

Respiratory rate of 36/min

Answer

Recent exposure to a family member with influenza

Answer

Recent sexual exposure to an HIV-positive patient

Answer

Purulent sputum with gram-positive diplococci on Gram stain

Question 4

Superior vena cava (SVC) syndrome is most commonly associated with which of the following conditions?

Accepted Answer

Lung cancer

Answer

Mediastinal fibrosis

Answer

Lymphoma

Answer

Tuberculous mediastinitis

Question 5

Caplan's syndrome is defined as:

Accepted Answer

Rheumatoid Arthritis and Pneumoconiosis

Answer

Splenomegaly and Neutropenia

Answer

Pneumoconiosis and Splenomegaly

Answer

Pneumoconiosis and Neutropenia

Question 6

Which of the following is NOT a feature of lobar pneumonia?

Accepted Answer

Segmental consolidation

Answer

Homogeneous consolidation

Answer

Air bronchogram sign present

Answer

Typical of pneumococcal infection

Question 7

Which of the following statements about pulmonary embolism is false?

Accepted Answer

Chest pain is the most common symptom.

Answer

It arises from a leg vein.

Answer

Increased survival time increases the chance for recovery.

Answer

Neck veins may be distended.

Question 8

Which of the following is characteristically not associated with the development of interstitial lung disease?

Accepted Answer

None of the above

Answer

Organic dusts

Answer

Inorganic dusts

Answer

Toxic gases

Question 9

What is the most common cause of an amoebic lung abscess?

Accepted Answer

Direct spread from the liver

Answer

Aspiration

Answer

Hematogenous spread from the liver

Answer

Hematogenous spread from the gut

Question 10

Corpulmonale is heart disease due to:

Accepted Answer

COPD affecting right ventricle

Answer

Left ventricular failure

Answer

Pericardial effusion

Answer

None of the above

Pulmonology — MCQs

Pulmonology — MCQs

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