Pulmonology — MCQs
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A 61-year-old male presents with increasing shortness of breath. A chest x-ray reveals a diffuse pulmonary infiltrate, and a transbronchial biopsy reveals fibrosis of the walls of the alveoli, many of which contain sheets of desquamated cells. Which of the following would be the best therapy for this patient?
Which of the following is NOT a feature of allergic bronchopulmonary aspergillosis (ABPA)?
Which of the following is not a feature of bronchiectasis?
Pneumothorax is not a usual occurrence with which of the following conditions?
What is the term for an endoscope used to examine the respiratory tract?
Alveolar hemorrhage is seen in all conditions except?
A 25-year-old patient presents with an incidental finding of a 2-cm solitary pulmonary nodule in the left lower lobe on a chest X-ray. The patient is asymptomatic and has no significant past medical history. Physical examination is normal. The nodule exhibits a "popcorn ball"-type calcification pattern. What is the most appropriate next step in management?
A silent chest is a clinical finding characterized by diminished or absent breath sounds. In which of the following conditions is a silent chest most likely to be observed?
A 35-year-old male, immobilized for 4 weeks due to a femur fracture, presents with sudden onset of chest pain and hemoptysis. An ECG shows an S1Q3T3 pattern. What is the most likely diagnosis?
Which of the following conditions is typically associated with cavitary lesions in the lung?
Pulmonology Indian Medical PG Practice Questions and MCQs
Question 401: A 61-year-old male presents with increasing shortness of breath. A chest x-ray reveals a diffuse pulmonary infiltrate, and a transbronchial biopsy reveals fibrosis of the walls of the alveoli, many of which contain sheets of desquamated cells. Which of the following would be the best therapy for this patient?
- A. Theophylline
- B. Steroids (Correct Answer)
- C. Antibiotics
- D. Isoniazid
Explanation: ### Explanation **Diagnosis: Desquamative Interstitial Pneumonia (DIP)** The clinical presentation and histopathology are classic for **Desquamative Interstitial Pneumonia (DIP)**, a rare idiopathic interstitial pneumonia strongly associated with **cigarette smoking** [1]. The hallmark biopsy finding is the accumulation of "sheets of desquamated cells" within the alveolar spaces; these cells are actually **intra-alveolar macrophages** containing brownish pigment (smoker’s macrophages), not epithelial cells as the name historically suggests. **1. Why Steroids are the Correct Answer:** DIP is highly responsive to treatment compared to other interstitial lung diseases like Idiopathic Pulmonary Fibrosis (IPF). The primary management involves **smoking cessation** and **systemic corticosteroids**. Steroids reduce the inflammatory infiltrate and alveolar macrophage accumulation, often leading to significant clinical and radiological improvement [1]. **2. Why Other Options are Incorrect:** * **A. Theophylline:** A methylxanthine bronchodilator used in COPD or asthma. It has no role in treating the parenchymal fibrosis or inflammatory cell infiltration seen in DIP. * **C. Antibiotics:** These are used for bacterial pneumonia. The biopsy showing chronic fibrosis and specific macrophage patterns points toward an interstitial process rather than an acute infectious consolidation. * **D. Isoniazid:** Used for Tuberculosis (TB). While TB can cause infiltrates, the specific histopathology of "sheets of desquamated cells" is pathognomonic for DIP, not granulomatous TB infection. **Clinical Pearls for NEET-PG:** * **Smoking-Related ILDs:** Remember the triad: DIP, Respiratory Bronchiolitis-Associated Interstitial Lung Disease (RB-ILD), and Langerhans Cell Histiocytosis (LCH). * **Histology Key:** DIP = Intra-alveolar macrophages; UIP (IPF) = Fibroblastic foci and honeycombing. * **Prognosis:** DIP has a much better prognosis (approx. 70% 10-year survival) than UIP/IPF.
Question 402: Which of the following is NOT a feature of allergic bronchopulmonary aspergillosis (ABPA)?
- A. Bronchial asthma
- B. Central bronchiectasis
- C. Peripheral eosinophilia
- D. Raised IgA levels (Correct Answer)
Explanation: ### Explanation **Allergic Bronchopulmonary Aspergillosis (ABPA)** is a complex hypersensitivity reaction to *Aspergillus fumigatus* that occurs almost exclusively in patients with bronchial asthma or cystic fibrosis [1]. **Why Option D is the correct answer:** In ABPA, the immune response is characterized by **Type I (IgE-mediated)** and **Type III (Immune-complex mediated)** hypersensitivity reactions [1]. Therefore, the hallmark laboratory finding is significantly **raised Total Serum IgE levels** (typically >1000 IU/mL) and specific IgE/IgG against *Aspergillus* [2]. **IgA levels are not typically elevated** or used as a diagnostic criterion for ABPA. **Why the other options are incorrect:** * **A. Bronchial Asthma:** This is a prerequisite for the diagnosis. ABPA presents as poorly controlled asthma with recurrent episodes of wheezing and cough [1]. * **B. Central Bronchiectasis:** This is a pathognomonic radiological feature of ABPA. Unlike post-infectious bronchiectasis which is usually peripheral, ABPA causes "inner two-thirds" or central airway dilation. * **C. Peripheral Eosinophilia:** An absolute eosinophil count (AEC) >500 cells/µL is a major diagnostic criterion, reflecting the systemic Th2-mediated allergic response. --- ### High-Yield Clinical Pearls for NEET-PG: * **Radiological Signs:** Look for **"Finger-in-glove" opacities** (mucoid impaction) and **"Tram-line" shadows** on Chest X-ray. * **High-Attenuation Mucus (HAM):** On CT, mucus plugs that are denser than skeletal muscle are highly specific for ABPA. * **Diagnosis:** Rosenberg-Patterson Criteria are used. The most important screening test is the **Aspergillus skin test** (immediate reactivity) or specific IgE [2]. * **Treatment:** The mainstay is **Oral Corticosteroids** (to reduce inflammation) and **Itraconazole** (to reduce the fungal burden/antigenic stimulus).
Question 403: Which of the following is not a feature of bronchiectasis?
- A. Tree in bud appearance
- B. Upper lung fields are commonly involved in cystic fibrosis
- C. Oral glucocorticoids are given for central bronchiectasis of ABPA
- D. Non-tuberculous mycobacteria involve the lower lobes (Correct Answer)
Explanation: ### Explanation **Correct Answer: D. Non-tuberculous mycobacteria involve the lower lobes** **Why Option D is the correct (incorrect statement):** Non-tuberculous mycobacteria (NTM), specifically the *Mycobacterium avium complex* (MAC), characteristically involve the **middle lobe and the lingula** (often referred to as Lady Windermere syndrome). While NTM can occur in the setting of pre-existing lung disease, it does not typically show a predilection for the lower lobes [1][2]. **Analysis of other options:** * **A. Tree-in-bud appearance:** This is a classic HRCT finding in bronchiectasis. It represents small airway (bronchiolar) impaction with mucus, pus, or fluid, resembling a budding tree. It is highly suggestive of active infectious spread. * **B. Upper lung involvement in Cystic Fibrosis (CF):** CF-related bronchiectasis characteristically begins in the **upper lobes** and progresses downwards [3][4]. This is a high-yield differentiator from other causes like idiopathic bronchiectasis, which often favors the lower lobes. * **C. Oral glucocorticoids for ABPA:** Allergic Bronchopulmonary Aspergillosis (ABPA) typically causes **central (proximal) bronchiectasis**. The mainstay of treatment is oral corticosteroids to reduce the inflammatory response to *Aspergillus* antigens, often combined with Itraconazole [1][2]. **NEET-PG High-Yield Pearls:** 1. **Cartagener Syndrome:** Triad of Situs inversus, Chronic sinusitis, and Bronchiectasis [5]. 2. **Signet Ring Sign:** On HRCT, a dilated bronchus appearing larger than its accompanying pulmonary artery (Broncho-arterial ratio >1). 3. **Tram-track Opacities:** Parallel linear shadows on Chest X-ray representing thickened bronchial walls [1]. 4. **Williams-Campbell Syndrome:** Congenital bronchiectasis due to deficiency of bronchial cartilage. 5. **Mounier-Kuhn Syndrome:** Tracheobronchomegaly.
Question 404: Pneumothorax is not a usual occurrence with which of the following conditions?
- A. Asthma
- B. Marfan's syndrome
- C. Bronchopulmonary aspergillosis (Correct Answer)
- D. Positive pressure ventilation
Explanation: ### Explanation The correct answer is **C. Bronchopulmonary aspergillosis (ABPA)**. **Why ABPA is the correct answer:** Allergic Bronchopulmonary Aspergillosis (ABPA) is a hypersensitivity reaction to *Aspergillus fumigatus* colonization. It typically results in **central bronchiectasis**, mucus plugging, and eosinophilic pneumonia. While it causes significant airway damage, it does **not** typically lead to the formation of subpleural blebs or distal alveolar rupture required to cause a pneumothorax [2]. In contrast, other fungal conditions like *Pneumocystis jirovecii* are notorious for causing pneumothorax, but ABPA is not. **Analysis of Incorrect Options:** * **Asthma:** Severe exacerbations can lead to air trapping and high intra-alveolar pressure, causing alveolar rupture. Air then dissects along the perivascular sheaths (pneumomediastinum) or into the pleural space (pneumothorax). * **Marfan’s Syndrome:** This connective tissue disorder is a classic risk factor for **primary spontaneous pneumothorax** [1]. Patients often have a tall, thin habitus and are prone to developing apical subpleural blebs due to structural weakness in the lung parenchyma [1]. * **Positive Pressure Ventilation (PPV):** This is a common cause of **iatrogenic barotrauma**. High peak inspiratory pressures can overdistend alveoli, leading to rupture and potentially life-threatening tension pneumothorax [3]. **NEET-PG High-Yield Pearls:** * **Most common cause of secondary spontaneous pneumothorax:** COPD (due to ruptured bullae). * **ABPA Diagnostic Hallmark:** "Finger-in-glove" appearance on Chest X-ray (due to mucoid impaction) and central bronchiectasis on HRCT. * **Catamenial Pneumothorax:** Occurs in relation to menstruation; associated with thoracic endometriosis (usually right-sided). * **Pneumocystis jirovecii (PJP):** The most common cause of spontaneous pneumothorax in HIV/AIDS patients.
Question 405: What is the term for an endoscope used to examine the respiratory tract?
- A. Bronchoscopy (Correct Answer)
- B. Laparoscopy
- C. Colonoscopy
- D. Arthroscopy
Explanation: The correct answer is **A. Bronchoscopy**. **1. Why Bronchoscopy is Correct:** The term is derived from the Greek word *"bronchos"* (windpipe) and *"skopein"* (to look). A bronchoscopist uses a thin, flexible, or rigid tube with a light and camera to visualize the upper and lower respiratory tract, including the larynx, trachea, and bronchi [1]. It is the gold-standard procedure for diagnosing endobronchial lesions, obtaining biopsies, and performing therapeutic interventions like foreign body removal [1]. **2. Why Other Options are Incorrect:** * **Laparoscopy:** Used to examine the **abdominal or pelvic cavity** through small incisions. It is a cornerstone of minimally invasive surgery. * **Colonoscopy:** Used to visualize the **large intestine (colon) and distal ileum** via the rectum [2]. It is primarily used for colorectal cancer screening. * **Arthroscopy:** Used to visualize and treat the interior of a **joint** (e.g., knee or shoulder) through a small incision. **3. NEET-PG High-Yield Clinical Pearls:** * **Types:** There are two types—**Flexible Bronchoscopy** (most common, done under local anesthesia/sedation) and **Rigid Bronchoscopy** (preferred for massive hemoptysis and foreign body removal in children, done under general anesthesia) [1]. * **Diagnostic Yield:** Bronchoalveolar Lavage (BAL) is often performed during bronchoscopy; a CD4:CD8 ratio >3.5 in BAL fluid is highly suggestive of **Sarcoidosis** [1]. * **Contraindications:** Severe refractory hypoxemia and recent myocardial infarction are major contraindications. * **Complication:** The most common serious complication following a transbronchial biopsy is **pneumothorax**.
Question 406: Alveolar hemorrhage is seen in all conditions except?
- A. Idiopathic pulmonary fibrosis (Correct Answer)
- B. Pulmonary capillaritis
- C. Systemic lupus erythematosus (SLE)
- D. Microscopic polyangiitis
Explanation: Explanation: Diffuse Alveolar Hemorrhage (DAH) is a life-threatening clinical syndrome characterized by the accumulation of blood in the alveolar spaces, typically resulting from damage to the alveolar-capillary basement membrane. Why Option A is the Correct Answer: Idiopathic Pulmonary Fibrosis (IPF) is a chronic, progressive fibrosing interstitial pneumonia. Its pathophysiology involves aberrant wound healing and fibroblast proliferation, leading to the destruction of lung architecture and "honeycombing." [1] It is not characterized by acute inflammation of the vessels or basement membrane disruption that leads to hemorrhage. Therefore, it does not cause alveolar hemorrhage. Why the other options are incorrect: * B. Pulmonary Capillaritis: This is the most common histological substrate for DAH. It involves neutrophilic infiltration of the alveolar septa, leading to the breakdown of the capillary-alveolar barrier. * C. Systemic Lupus Erythematosus (SLE): SLE can cause DAH through immune complex deposition and subsequent capillaritis. [2] It is a rare but severe pulmonary manifestation of the disease. * D. Microscopic Polyangiitis (MPA): This is an ANCA-associated small-vessel vasculitis. [2] It is one of the most common causes of pulmonary-renal syndrome, frequently presenting with alveolar hemorrhage and glomerulonephritis. High-Yield Clinical Pearls for NEET-PG: 1. Triad of DAH: Hemoptysis, anemia, and diffuse radiographic opacities. (Note: Hemoptysis may be absent in up to 33% of cases). 2. Gold Standard Diagnosis: Bronchoalveolar lavage (BAL) showing persistently bloody return or >20% hemosiderin-laden macrophages. 3. Common Causes: Goodpasture syndrome (anti-GBM), Granulomatosis with polyangiitis (GPA), and MPA. [2] 4. DLCO in DAH: Unlike most lung pathologies, the DLCO is increased in DAH because intra-alveolar hemoglobin binds to carbon monoxide.
Question 407: A 25-year-old patient presents with an incidental finding of a 2-cm solitary pulmonary nodule in the left lower lobe on a chest X-ray. The patient is asymptomatic and has no significant past medical history. Physical examination is normal. The nodule exhibits a "popcorn ball"-type calcification pattern. What is the most appropriate next step in management?
- A. Left lower lobe resection
- B. Serial chest X-rays (Correct Answer)
- C. Needle aspiration biopsy
- D. Left pneumonectomy
Explanation: **Explanation:** The clinical presentation and radiographic findings are classic for a **Pulmonary Hamartoma**, the most common benign lung tumor. The pathognomonic sign is the **"popcorn" calcification** pattern seen on imaging. **Why Serial Chest X-rays is correct:** In a young, asymptomatic patient with a solitary pulmonary nodule (SPN) exhibiting clearly benign radiological features (like popcorn calcification, fat density on CT, or stability for >2 years), the risk of malignancy is extremely low (<1%). The standard management for a low-risk SPN is **observation with serial imaging** (typically at 3, 6, 12, and 24 months) to confirm stability [1]. If the nodule remains stable for two years, it is considered benign, and no further follow-up is required [1]. **Why the other options are incorrect:** * **A & D (Resection/Pneumonectomy):** Surgical intervention is reserved for nodules with a high probability of malignancy or those that are symptomatic. A pneumonectomy is never indicated for a 2-cm peripheral nodule. * **C (Needle Aspiration Biopsy):** Invasive procedures like FNAC or biopsy are indicated only when the diagnosis is uncertain or the risk of malignancy is intermediate/high. In this case, the "popcorn" calcification is diagnostic of a benign hamartoma, making biopsy unnecessary. **NEET-PG High-Yield Pearls:** * **Hamartoma Triad:** Asymptomatic + Popcorn calcification + Fat density on CT. * **Benign Calcification Patterns:** Popcorn (Hamartoma), Diffuse, Central, or Laminated (Granulomatous disease like TB/Histoplasmosis). * **Malignant Calcification Patterns:** Eccentric or Stippled. * **Size Matters:** Nodules <8 mm are generally monitored; nodules >8 mm require formal risk stratification (Fleischner Society guidelines).
Question 408: A silent chest is a clinical finding characterized by diminished or absent breath sounds. In which of the following conditions is a silent chest most likely to be observed?
- A. Very severe asthma (Correct Answer)
- B. Chronic bronchitis
- C. Emphysema
- D. Bronchiectasis
Explanation: ### Explanation **1. Why "Very Severe Asthma" is Correct:** A "silent chest" is a critical clinical sign indicating a life-threatening exacerbation of asthma. It occurs when there is extreme airway obstruction due to severe bronchospasm, mucosal edema, and thick mucus plugging. This leads to such a profound reduction in airflow (minute ventilation) that the air movement is insufficient to generate audible breath sounds or wheezing. In this scenario, the disappearance of a wheeze is an **ominous sign** of impending respiratory failure, rather than a sign of improvement. **2. Why the Other Options are Incorrect:** * **Chronic Bronchitis:** Characterized by a productive cough and "noisy" chest. Auscultation typically reveals coarse crackles and rhonchi due to excessive mucus in the large airways. * **Emphysema:** While breath sounds are often diminished (quiet chest) due to hyperinflation and alveolar destruction, they are rarely completely absent or "silent" unless a complication like pneumothorax occurs. * **Bronchiectasis:** This is a chronic suppurative lung disease. Auscultation typically reveals prominent, coarse crackles (often persistent) and sometimes wheezing, but not a silent chest. **3. Clinical Pearls for NEET-PG:** * **The "Silent" Danger:** In acute asthma, a "silent chest" is often accompanied by other danger signs: cyanosis, bradycardia, exhaustion, and a **normal or rising $PaCO_2$** (indicating the patient can no longer maintain the hyperventilation needed to blow off $CO_2$) [1]. * **Management:** A silent chest is a medical emergency requiring immediate aggressive bronchodilation, systemic corticosteroids, and often ICU admission for ventilatory support [1]. * **Auscultation Rule:** If a patient in respiratory distress has no audible breath sounds, do not assume they are stable; they are likely in **Status Asthmaticus**.
Question 409: A 35-year-old male, immobilized for 4 weeks due to a femur fracture, presents with sudden onset of chest pain and hemoptysis. An ECG shows an S1Q3T3 pattern. What is the most likely diagnosis?
- A. Acute myocardial infarction
- B. COPD exacerbation
- C. Pulmonary embolism (Correct Answer)
- D. Cor pulmonale
Explanation: ### Explanation **Correct Answer: C. Pulmonary Embolism** **1. Why it is correct:** The clinical presentation is a classic triad for **Pulmonary Embolism (PE)**: prolonged immobilization (Virchow’s triad: stasis), sudden onset pleuritic chest pain, and hemoptysis [1], [4]. The **S1Q3T3 pattern** (a prominent S-wave in lead I, a Q-wave in lead III, and an inverted T-wave in lead III) is a classic, though non-specific, ECG sign of acute right heart strain caused by a massive or sub-massive PE [3]. **2. Why the other options are incorrect:** * **A. Acute Myocardial Infarction:** While it causes chest pain, it typically presents with ST-segment elevation or depression and T-wave inversions in specific vascular territories, not the S1Q3T3 pattern [3]. Hemoptysis is rare in MI. * **B. COPD Exacerbation:** This usually presents with chronic cough, wheezing, and increased sputum production. While it can cause right heart strain, the acute onset following immobilization strongly points toward a thromboembolic event. * **C. Cor Pulmonale:** This refers to right-sided heart failure resulting from chronic pulmonary hypertension (often due to COPD). While it shows right axis deviation on ECG, it is a chronic process, not an acute presentation with hemoptysis and sudden pain [3]. **3. Clinical Pearls for NEET-PG:** * **Most common ECG finding in PE:** Sinus tachycardia (S1Q3T3 is specific but only present in ~20% of cases) [3]. * **Gold Standard Investigation:** CT Pulmonary Angiography (CTPA) [2]. * **Chest X-ray:** Usually normal, but look for **Hampton’s Hump** (wedge-shaped opacity) or **Westermark Sign** (focal oligemia) [3]. * **Initial Screening:** D-dimer (high negative predictive value; used to rule out PE in low-risk patients).
Question 410: Which of the following conditions is typically associated with cavitary lesions in the lung?
- A. Primary pulmonary tuberculosis
- B. Staphylococcal pneumonia (Correct Answer)
- C. Pneumoconiosis
- D. Interstitial lung disease
Explanation: Explanation: Staphylococcal pneumonia is a classic cause of necrotizing pneumonia, leading to tissue destruction and the formation of cavitary lesions or pneumatoceles (thin-walled, air-filled cysts). [2] This occurs due to the release of potent exotoxins and enzymes (like Panton-Valentine Leukocidin) by Staphylococcus aureus, which cause liquefactive necrosis of the lung parenchyma. In the pediatric population, pneumatoceles are a hallmark finding of Staph pneumonia. Analysis of Incorrect Options: Primary Pulmonary Tuberculosis: Typically presents with the Ghon complex (subpleural nodule + hilar lymphadenopathy). Cavitation is a hallmark of Secondary (Reactivation) TB, usually involving the apical segments, not primary TB. [1] Pneumoconiosis: These are restrictive lung diseases caused by dust inhalation (e.g., Silicosis, Asbestosis). They generally present with diffuse nodular opacities or progressive massive fibrosis (PMF), but not acute cavitation (unless complicated by TB). Interstitial Lung Disease (ILD): Characterized by inflammation and fibrosis of the alveolar interstitium. Radiologically, it presents with reticular patterns, ground-glass opacities, or honeycombing in end-stage disease, but not true cavitary lesions. NEET-PG High-Yield Pearls: Common causes of lung cavities: Remember the mnemonic "CAVITY": Cancer (SCC), Autoimmune (Wegener’s) [3], Vascular (Septic emboli), Infection (Staph, Klebsiella, TB, Fungal), Trauma, Youth (CPAM). Klebsiella pneumoniae is another common cause of cavitary lesions, often associated with the "Bulging Fissure Sign." If a patient with a history of IV drug abuse presents with multiple peripheral cavitary nodules, suspect Septic Pulmonary Emboli (often S. aureus from tricuspid endocarditis).
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Obstructive Airway Diseases (Asthma, COPD)
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Interstitial Lung Diseases
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Pulmonary Infections
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Pulmonary Vascular Diseases
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Pleural Diseases
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Sleep-Disordered Breathing
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Respiratory Failure
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Mediastinal Disorders
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Occupational Lung Diseases
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Pulmonary Function Testing
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Bronchiectasis and Cystic Fibrosis
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Lung Cancer Approach
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