Pulmonology — MCQs
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What is the characteristic radiological finding in sarcoidosis?
Pneumatocele is commonly found in which type of pneumonia?
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?
Superior vena cava (SVC) syndrome is most commonly associated with which of the following conditions?
Caplan's syndrome is defined as:
Which of the following is NOT a feature of lobar pneumonia?
Which of the following statements about pulmonary embolism is false?
Which of the following is characteristically not associated with the development of interstitial lung disease?
What is the most common cause of an amoebic lung abscess?
Corpulmonale is heart disease due to:
Pulmonology Indian Medical PG Practice Questions and MCQs
Question 681: What is the characteristic radiological finding in sarcoidosis?
- A. Parenchymal disease
- B. Unilateral hilar lymphadenopathy
- C. Bilateral hilar lymphadenopathy (Correct Answer)
- D. Miliary shadow
Explanation: **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.
Question 682: Pneumatocele is commonly found in which type of pneumonia?
- A. Pneumocystis jirovecii pneumonia (Correct Answer)
- B. Staphylococcal pneumonia
- C. Klebsiella pneumonia
- D. Pseudomonas pneumonia
Explanation: ### Explanation **Pneumatocele** refers to a thin-walled, air-filled cyst within the lung parenchyma. While traditionally associated with *Staphylococcus aureus*, recent clinical trends and NEET-PG patterns emphasize its high prevalence in **Pneumocystis jirovecii pneumonia (PJP)**, especially in HIV-positive patients [1]. #### Why Option A is Correct In **Pneumocystis jirovecii pneumonia**, pneumatoceles occur in approximately 10–35% of cases. They result from the invasion of the alveolar wall by the fungus, leading to tissue necrosis and a "check-valve" mechanism of air trapping [1]. These cysts are often multiple, vary in size, and are a major risk factor for **spontaneous pneumothorax**, a classic complication of PJP [1]. #### Why Other Options are Incorrect * **B. Staphylococcal pneumonia:** Historically, this was the most common cause, particularly in infants and children. While it remains a significant cause of pneumatoceles (often following abscess formation), in the context of adult medicine and modern examinations, PJP is the preferred association for thin-walled cysts. * **C. Klebsiella pneumonia:** Characteristically causes "Friedlander’s pneumonia" with a **bulging fissure sign** and heavy, mucoid sputum. It leads to lung abscesses and cavitation rather than thin-walled pneumatoceles. * **D. Pseudomonas pneumonia:** Typically presents as a necrotizing pneumonia with rapid cavitation and micro-abscesses, commonly seen in ventilated or cystic fibrosis patients. #### High-Yield Clinical Pearls for NEET-PG * **PJP Triad:** Dyspnea, non-productive cough, and fever in an immunocompromised host. * **Radiology of PJP:** Bilateral perihilar ground-glass opacities (GGO). Pneumatoceles are often found in the upper lobes. * **Diagnosis:** Induced sputum or Bronchoalveolar Lavage (BAL) using **Gomori Methenamine Silver (GMS)** stain (shows crushed-cup shaped cysts) [1]. * **Treatment:** DOC is **TMP-SMX**. Steroids are added if $PaO_2 < 70$ mmHg or A-a gradient $> 35$ mmHg [1].
Question 683: 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?
- A. Recent exposure to a family member with influenza
- B. Respiratory rate of 36/min (Correct Answer)
- C. Recent sexual exposure to an HIV-positive patient
- D. Purulent sputum with gram-positive diplococci on Gram stain
Explanation: ### Explanation The patient presents with classic symptoms of **Community-Acquired Pneumonia (CAP)**. In clinical practice and for NEET-PG, the decision to admit a patient with CAP is guided by validated scoring systems, most notably the **CURB-65 score** [1]. **Why Option B is Correct:** The **CURB-65** criteria include [1]: * **C:** Confusion * **U:** Urea >19 mg/dL (7 mmol/L) * **R:** **Respiratory rate ≥30/min** * **B:** Blood pressure (Systolic <90 or Diastolic ≤60 mmHg) * **65:** Age ≥65 years A respiratory rate of **36/min** satisfies the "R" criterion. Each point increases mortality risk; a score of ≥2 generally warrants inpatient admission, while ≥3 often requires ICU consideration [1]. Tachypnea is a sensitive indicator of respiratory distress and potential impending respiratory failure, making it the strongest clinical indicator for IV antibiotics and monitoring among the choices provided [2]. **Analysis of Incorrect Options:** * **Option A:** Influenza exposure increases the risk of secondary bacterial pneumonia (e.g., *S. aureus*), but it does not objectively dictate the site of care (inpatient vs. outpatient) [3]. * **Option B:** HIV exposure may change the differential diagnosis (e.g., *Pneumocystis jirovecii*), but admission is based on current physiological stability, not just risk factors [3]. * **Option D:** Gram-positive diplococci (*Streptococcus pneumoniae*) is the most common cause of CAP [3]. While it confirms the etiology, it does not determine the severity of the illness. **Clinical Pearls for NEET-PG:** * **PSI (Pneumonia Severity Index):** More complex than CURB-65 but superior for identifying low-risk patients who can be treated safely at home. * **First-line Outpatient Treatment:** Amoxicillin or Doxycycline (in areas with low macrolide resistance). * **Inpatient Treatment:** Respiratory Fluoroquinolone (e.g., Levofloxacin) OR a Beta-lactam plus a Macrolide. * **Right Middle Lobe Consolidation:** Classically associated with "silhouetting" of the right heart border on CXR.
Question 684: Superior vena cava (SVC) syndrome is most commonly associated with which of the following conditions?
- A. Mediastinal fibrosis
- B. Lymphoma
- C. Lung cancer (Correct Answer)
- D. Tuberculous mediastinitis
Explanation: 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.
Question 685: Caplan's syndrome is defined as:
- A. Splenomegaly and Neutropenia
- B. Rheumatoid Arthritis and Pneumoconiosis (Correct Answer)
- C. Pneumoconiosis and Splenomegaly
- D. Pneumoconiosis and Neutropenia
Explanation: **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).
Question 686: Which of the following is NOT a feature of lobar pneumonia?
- A. Homogeneous consolidation
- B. Air bronchogram sign present
- C. Segmental consolidation (Correct Answer)
- D. Typical of pneumococcal infection
Explanation: ### 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.
Question 687: Which of the following statements about pulmonary embolism is false?
- A. Chest pain is the most common symptom. (Correct Answer)
- B. It arises from a leg vein.
- C. Increased survival time increases the chance for recovery.
- D. Neck veins may be distended.
Explanation: **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).
Question 688: Which of the following is characteristically not associated with the development of interstitial lung disease?
- A. Organic dusts
- B. Inorganic dusts
- C. Toxic gases
- D. None of the above (Correct Answer)
Explanation: **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].
Question 689: What is the most common cause of an amoebic lung abscess?
- A. Aspiration
- B. Direct spread from the liver (Correct Answer)
- C. Hematogenous spread from the liver
- D. Hematogenous spread from the gut
Explanation: **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.
Question 690: Corpulmonale is heart disease due to:
- A. COPD affecting right ventricle (Correct Answer)
- B. Left ventricular failure
- C. Pericardial effusion
- D. None of the above
Explanation: **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.
Practice by Chapter
Obstructive Airway Diseases (Asthma, COPD)
Practice Questions
Interstitial Lung Diseases
Practice Questions
Pulmonary Infections
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Pulmonary Vascular Diseases
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Pleural Diseases
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Sleep-Disordered Breathing
Practice Questions
Respiratory Failure
Practice Questions
Mediastinal Disorders
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Occupational Lung Diseases
Practice Questions
Pulmonary Function Testing
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Bronchiectasis and Cystic Fibrosis
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Lung Cancer Approach
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