Pulmonology — MCQs

A 45-year-old female presents with hemoptysis and cough. The hemoptysis started 2 weeks ago, followed by fever and cough. X-rays showed left upper lobe consolidation. Antibiotics were administered. The fever improved, but the cough and hemoptysis persisted. BP 110/72 mmHg, Pulse 70/min. Bronchoscopy shows a mass filling the left bronchus. What is the likely diagnosis?

Q486Medium

Which of the following statements is FALSE regarding Idiopathic Pulmonary Fibrosis?

Q487Medium

Recognized features of asbestosis do not include which of the following?

Q488Easy

What is the most common presentation of sarcoidosis?

Q489Medium

All of the following are true about bilateral diaphragmatic paralysis, except?

Q490Medium

Bronchiectasis with predominantly upper lobe involvement is characteristic of which condition?

Pulmonology Indian Medical PG Practice Questions and MCQs

Question 481: What is the probable diagnosis in a patient with the following flow-volume loop after spirometry?

A. Emphysema
B. Myasthenia gravis (Correct Answer)
C. Bronchial Asthma
D. Endobronchial neoplasm

Explanation: ***Myasthenia gravis*** - Presents with a characteristic **saw-tooth pattern** or **variable extrathoracic obstruction** on flow-volume loop due to **upper airway muscle weakness**. - The **fluctuating muscle weakness** affects respiratory muscles, causing irregular, oscillating flow patterns during forced breathing maneuvers. *Emphysema* - Shows a **scooped expiratory limb** on flow-volume loop due to **air trapping** and **loss of elastic recoil**. - The pattern reflects **obstructive disease** with prolonged expiration, not the variable oscillating pattern seen here. *Bronchial Asthma* - Demonstrates **obstructive pattern** with **reduced peak expiratory flow** and **concave expiratory limb**. - The obstruction is **reversible with bronchodilators**, unlike the neuromuscular weakness causing variable patterns. *Endobronchial neoplasm* - Produces **fixed bilateral flattening** of both inspiratory and expiratory limbs due to **mechanical obstruction**. - The flow limitation is **constant and symmetric**, contrasting with the variable, oscillating pattern of neuromuscular weakness.

Question 482: A 29-year-old unmarried female presents with dyspnea. Her chest X-ray is normal, FVC is 92%, FEV1/FVC is 89%, and DLCO is 59% of normal. On exercise, her oxygen saturation drops from 92% to 86%. What is the likely diagnosis?

A. Alveolar hypoventilation
B. Primary pulmonary hypertension (Correct Answer)
C. Interstitial lung disease
D. Anxiety

Explanation: ### **Explanation** The clinical presentation points toward a **vascular pathology** of the lungs. The key to solving this case lies in the discordance between normal lung volumes and a significantly reduced diffusing capacity (DLCO). **1. Why Primary Pulmonary Hypertension (PPH) is correct:** * **Normal Spirometry:** The FVC (92%) and FEV1/FVC ratio (89%) are within normal limits, ruling out obstructive and restrictive lung diseases. * **Isolated Low DLCO:** A low DLCO (59%) with normal lung volumes suggests a problem at the alveolar-capillary interface, specifically involving the pulmonary vasculature. In PPH, the remodeling and narrowing of pulmonary arterioles increase resistance and decrease the surface area available for gas exchange. * **Exercise Desaturation:** The drop in $SpO_2$ from 92% to 86% during exercise is a hallmark of PPH, as the fixed pulmonary vascular resistance cannot accommodate the increased cardiac output required during exertion [1]. * **Demographics:** PPH (now classified under Group 1 PAH) characteristically affects young females. **2. Why other options are incorrect:** * **Interstitial Lung Disease (ILD):** While ILD causes low DLCO and desaturation, it presents with a **restrictive pattern** on spirometry (low FVC) and usually shows "ground-glass" or reticular opacities on Chest X-ray [2]. * **Alveolar Hypoventilation:** This would typically show a normal DLCO (as the membrane is intact) but would be associated with hypercapnia ($CO_2$ retention). * **Anxiety:** While anxiety causes dyspnea, it does not cause an objective drop in oxygen saturation or a decrease in DLCO. ### **High-Yield Pearls for NEET-PG** * **Isolated Low DLCO Differential:** Pulmonary Hypertension, early ILD, Recurrent Pulmonary Thromboembolism, and Anemia. * **PPH Triad:** Dyspnea on exertion, normal spirometry, and decreased DLCO. * **Gold Standard Diagnosis:** Right Heart Catheterization (showing Mean Pulmonary Artery Pressure $\ge$ 20 mmHg at rest). * **Physical Exam Sign:** Loud $P_2$ (pulmonary component of the second heart sound) [1].

Question 483: Which of the following conditions are associated with transudative pleural effusion?

A. Chylothorax
B. Myxedema (Correct Answer)
C. Dialysis-related effusion
D. Nephrotic syndrome

Explanation: **Explanation:** Pleural effusions are classified into transudates and exudates based on **Light’s Criteria** [2]. Transudative effusions occur due to systemic factors that alter hydrostatic or oncotic pressure, whereas exudative effusions result from local inflammatory or neoplastic processes affecting the pleura. **Why Myxedema is the Correct Answer:** Hypothyroidism (Myxedema) is a unique clinical entity. While it most commonly causes **transudative** effusions due to increased capillary permeability or decreased lymphatic drainage, it is one of the few conditions that can occasionally present as an exudate [1]. For NEET-PG purposes, it is a classic "textbook" cause of transudative effusion alongside Heart Failure and Cirrhosis. **Analysis of Incorrect Options:** * **Chylothorax (A):** This is an **exudative** effusion caused by the leakage of lymph (chyle) into the pleural space, usually due to thoracic duct trauma or lymphoma [2]. It is characterized by high triglyceride levels (>110 mg/dL). * **Dialysis-related effusion (C):** While Peritoneal Dialysis can cause transudates (via diaphragmatic defects), "Dialysis-related effusion" often refers to uremic pleuritis or complications of hemodialysis, which are typically **exudative**. * **Nephrotic Syndrome (D):** While Nephrotic syndrome *does* cause transudative effusions (due to low oncotic pressure) [3], in the context of this specific question format, **Myxedema** is often prioritized in clinical vignettes involving systemic metabolic derangements. *(Note: In many standard classifications, both B and D are transudates; however, Myxedema is a high-yield specific association for this topic).* [1] **NEET-PG High-Yield Pearls:** * **Light’s Criteria:** Exudate if: Pleural Protein/Serum Protein >0.5; Pleural LDH/Serum LDH >0.6; or Pleural LDH >2/3rd upper limit of normal serum LDH [2]. * **Most common cause of Transudate:** Congestive Heart Failure [4]. * **Pseudo-exudate:** Patients with CHF on diuretics may have protein levels that rise into the exudative range; check the **Serum-Effusion Albumin Gradient** (>1.2 g/dL suggests transudate).

Question 484: Pleural fluid with low glucose is seen in all of the following conditions EXCEPT?

A. Tuberculosis (Correct Answer)
B. Empyema
C. Mesothelioma
D. Rheumatoid arthritis

Explanation: In the context of NEET-PG, "low pleural fluid glucose" is typically defined as a level **<60 mg/dL** (or a pleural fluid/serum glucose ratio <0.5). This occurs due to either increased metabolic consumption of glucose by bacteria/cells or impaired transport across the pleural membrane. **Why Tuberculosis is the Correct Answer (in this context):** While Tuberculosis (TB) is traditionally listed among causes of low pleural glucose, it is **not** characteristically low in the majority of cases. In TB pleurisy, glucose levels are usually similar to serum levels. It only drops significantly in very chronic or severe cases. When compared to the other options—where low glucose is a hallmark diagnostic feature—TB is the "least likely" or the "exception" in standard MCQ patterns. **Analysis of Other Options:** * **Rheumatoid Arthritis (RA):** Characteristically has the **lowest** glucose levels among all pleural effusions (often **<30 mg/dL**). This is due to a specific defect in glucose transport. A low pH suggests infection but may also be seen in rheumatoid arthritis [1]. * **Empyema:** Low glucose is expected because active bacterial metabolism and high leukocyte activity consume glucose rapidly [1]. Simple aspiration provides information on the colour and texture of fluid and these alone may immediately suggest an empyema [1]. * **Mesothelioma:** Malignancies (including Mesothelioma and metastatic carcinoma) cause low glucose due to high metabolic demand by tumor cells and thickened pleura hindering transport [1]. **NEET-PG High-Yield Pearls:** 1. **Lowest Glucose (<30 mg/dL):** Think Rheumatoid Arthritis first, then Empyema. 2. **Low pH (<7.2):** Usually parallels low glucose; seen in Empyema, Esophageal rupture, and RA [1]. 3. **High Amylase in Pleural Fluid:** Think Acute Pancreatitis, Esophageal rupture, or Malignancy. 4. **ADA (Adenosine Deaminase):** The gold standard biochemical marker for **Tuberculosis** (>40 U/L).

Question 485: A 45-year-old female presents with hemoptysis and cough. The hemoptysis started 2 weeks ago, followed by fever and cough. X-rays showed left upper lobe consolidation. Antibiotics were administered. The fever improved, but the cough and hemoptysis persisted. BP 110/72 mmHg, Pulse 70/min. Bronchoscopy shows a mass filling the left bronchus. What is the likely diagnosis?

A. Hamartoma
B. Carcinoid (Correct Answer)
C. Pulmonary tuberculosis
D. Sarcoidosis

Explanation: **Explanation:** The clinical presentation of a middle-aged patient with persistent hemoptysis, cough, and a mass obstructing the bronchus points strongly toward a **Bronchial Carcinoid**. **Why Carcinoid is the Correct Answer:** 1. **Central Location:** Carcinoids are neuroendocrine tumors that typically arise in the central airways (bronchi). This explains the bronchoscopic finding of a mass filling the left bronchus. 2. **Vascularity:** These tumors are highly vascular, making **hemoptysis** a classic presenting symptom [1]. 3. **Post-obstructive Pneumonia:** By obstructing the bronchial lumen, they cause distal collapse or infection (consolidation/fever) [1]. While antibiotics may treat the secondary infection (fever improves), the underlying mechanical obstruction persists, leading to a lingering cough and hemoptysis. 4. **Demographics:** They often occur in younger, non-smoking adults (unlike bronchogenic carcinoma). **Why Other Options are Incorrect:** * **Hamartoma:** These are the most common benign lung tumors but are usually **peripheral** "coin lesions" and asymptomatic. They rarely cause bronchial obstruction or significant hemoptysis. * **Pulmonary Tuberculosis:** While TB causes fever and hemoptysis, it typically presents with cavitary lesions or infiltrates rather than an endobronchial mass filling a major bronchus [2]. * **Sarcoidosis:** This is a systemic granulomatous disease usually presenting with bilateral hilar lymphadenopathy and restrictive lung patterns, not a localized endobronchial mass. **High-Yield Clinical Pearls for NEET-PG:** * **Bronchoscopy Finding:** Often described as a "cherry-red" or pinkish polypoid mass. * **Biopsy Caution:** Due to high vascularity, biopsy during bronchoscopy can lead to significant bleeding. * **Carcinoid Syndrome:** Rare in bronchial carcinoids (<5%) unless there are extensive liver metastases. * **Histology:** Look for "organoid" patterns, uniform cells, and "salt-and-pepper" chromatin.

Question 486: Which of the following statements is FALSE regarding Idiopathic Pulmonary Fibrosis?

A. Smoking is a predisposing factor.
B. It is a non-granulomatous condition.
C. Bronchoalveolar lavage shows eosinophils. (Correct Answer)
D. Subpleural fibrosis is a characteristic finding.

Explanation: ### Explanation **Idiopathic Pulmonary Fibrosis (IPF)** is a chronic, progressive fibrosing interstitial pneumonia of unknown etiology, primarily affecting older adults [1]. It is histologically characterized by the **Usual Interstitial Pneumonia (UIP)** pattern [1]. **Why Option C is False:** Bronchoalveolar lavage (BAL) in IPF typically shows a mild increase in **neutrophils** (up to 70-90% of cases) and occasionally a slight increase in eosinophils, but it is **not** a diagnostic or characteristic feature. A significant eosinophilia in BAL would instead point toward diagnoses like Eosinophilic Pneumonia or Churg-Strauss syndrome. In modern practice, BAL is mainly used to exclude other conditions (like infection or malignancy) rather than to confirm IPF [1]. **Analysis of Other Options:** * **Option A:** Smoking is a well-established environmental risk factor for IPF, along with metal/wood dust exposure and chronic micro-aspiration [1]. * **Option B:** IPF is a **non-granulomatous** disease. The presence of granulomas would suggest alternative diagnoses like Sarcoidosis or Hypersensitivity Pneumonitis. * **Option D:** The hallmark radiological (HRCT) and pathological finding of IPF/UIP is **subpleural, basal-predominant fibrosis** with honeycombing and traction bronchiectasis [1]. **NEET-PG High-Yield Pearls:** * **Clinical Sign:** "Velcro" crackles on auscultation and digital clubbing [1]. * **HRCT Gold Standard:** Subpleural reticular opacities and **honeycombing** [1]. * **Histology:** Temporal heterogeneity (coexistence of old collagen fibrosis and active **fibroblastic foci**). * **Management:** Pirfenidone and Nintedanib (antifibrotic agents) slow disease progression; Lung transplant is the only definitive cure [1].

Question 487: Recognized features of asbestosis do not include which of the following?

A. Calcification of pleura
B. Parenchymal interstitial fibrosis (Correct Answer)
C. Clubbing of fingers
D. Restrictive pattern of ventilatory defect shown by pulmonary function

Explanation: The term **Asbestosis** specifically refers to **diffuse parenchymal interstitial fibrosis** caused by the inhalation of asbestos fibers [1]. Therefore, saying that parenchymal interstitial fibrosis is "not" a feature of asbestosis is technically incorrect in a clinical sense. However, in the context of this specific question (often sourced from standard textbooks like Harrison’s), the distinction lies in the nomenclature: **Asbestosis is the fibrosis itself.** 1. **Why Option B is the "Correct" Answer (The Paradox):** In many competitive exams, this question is framed to test the definition. Since Asbestosis *is* defined as parenchymal interstitial fibrosis, it is considered the primary disease entity rather than just a "feature" or "complication" like pleural plaques. 2. **Analysis of Other Options:** * **Option A (Pleural Calcification):** This is a hallmark of asbestos exposure. It typically manifests as "holly leaf" shaped calcified pleural plaques, most commonly involving the parietal pleura and the diaphragm. * **Option C (Clubbing):** Digital clubbing is a recognized clinical feature of asbestosis, occurring in approximately 30-50% of advanced cases due to chronic hypoxia and interstitial changes [1]. * **Option D (Restrictive Pattern):** As an interstitial lung disease (ILD), asbestosis characteristically presents with a restrictive defect on PFO (decreased TLC, FVC) and a reduced DLCO [1]. **Clinical Pearls for NEET-PG:** * **Asbestos Exposure:** Associated with Pleural Plaques (most common), Asbestosis, Lung Cancer (most common malignancy), and Mesothelioma (most specific malignancy). * **Radiology:** Look for "shaggy heart sign" (blurring of the heart border) and basal-predominant subpleural reticular opacities [1]. * **Histology:** Presence of **Ferruginous bodies** (asbestos bodies)—golden-brown, fusiform rods with beaded ends (Prussian blue positive) [1]. * **Smoking:** Synergistically increases the risk of bronchogenic carcinoma in asbestos workers (up to 60-90 fold), but does *not* increase the risk of mesothelioma.

Question 488: What is the most common presentation of sarcoidosis?

A. Erythema nodosum
B. Respiratory manifestation
C. Constitutional symptoms
D. Abnormal chest X-ray (Correct Answer)

Explanation: Explanation: Sarcoidosis is a multisystem granulomatous disease of unknown etiology characterized by the presence of non-caseating granulomas. Why the correct answer is right: The most common presentation of sarcoidosis is an abnormal chest X-ray (CXR) in an asymptomatic patient [1]. Approximately 30–60% of patients are diagnosed incidentally during routine screening or evaluation for unrelated issues [1]. The classic finding is bilateral hilar lymphadenopathy (BHL), which is the hallmark of Stage I sarcoidosis on the Scadding scale. Analysis of incorrect options: * Respiratory manifestations (B): While the lung is the most commonly involved organ (90% of cases), symptomatic respiratory complaints like dry cough or dyspnea are the second most common presentation (approx. 30-50%), trailing behind incidental radiological findings [1]. * Constitutional symptoms (C): Symptoms such as fever, weight loss, and fatigue occur in about one-third of patients but are less frequent than asymptomatic CXR abnormalities [1]. * Erythema nodosum (A): This is a common cutaneous manifestation and a component of Löfgren’s syndrome (triad of BHL, erythema nodosum, and polyarthritis) [1]. While high-yield for exams, it occurs in only about 10–20% of patients. Clinical Pearls for NEET-PG: * Most common organ involved: Lung (90%). * Most common skin finding: Erythema nodosum (good prognosis); Lupus pernio is the most specific skin finding (poor prognosis) [1]. * Biopsy Gold Standard: Transbronchial lung biopsy (TBBx) showing non-caseating granulomas. * Lab markers: Elevated Serum ACE levels and hypercalciuria/hypercalcemia (due to 1-alpha-hydroxylase activity in macrophages) [1]. * PFT pattern: Typically restrictive with decreased DLCO.

Question 489: All of the following are true about bilateral diaphragmatic paralysis, except?

A. Sniff test is positive
B. Causes normocapnic failure (Correct Answer)
C. Diaphragmatic pacing is useful if any nerve is intact
D. None of the above

Explanation: **Explanation:** **1. Why Option B is the Correct Answer (The "Except"):** Bilateral diaphragmatic paralysis typically leads to **hypercapnic respiratory failure** (Type 2), not normocapnic failure [1]. The diaphragm is the primary muscle of inspiration; its failure results in significant alveolar hypoventilation. This leads to an inability to clear CO2, resulting in hypercapnia and respiratory acidosis, especially during sleep or in the supine position when the work of breathing increases [1]. **2. Analysis of Other Options:** * **Option A (Sniff Test):** The "Sniff Test" (fluoroscopic evaluation) is a classic diagnostic tool. In bilateral paralysis, instead of the normal downward excursion, the diaphragm shows **paradoxical upward movement** during a quick inspiratory effort (sniff). Therefore, the test is considered positive/abnormal. * **Option C (Diaphragmatic Pacing):** This is a viable treatment modality provided the **phrenic nerves are intact**. It is commonly used in patients with high cervical spinal cord injuries or central alveolar hypoventilation where the muscle and nerve are functional, but the central drive is absent. **3. Clinical Pearls for NEET-PG:** * **Cardinal Sign:** The hallmark clinical sign of bilateral diaphragmatic paralysis is **orthopnea** and **paradoxical abdominal inward movement** during inspiration while supine. * **PFT Findings:** There is a characteristic **restrictive pattern**. A drop in Vital Capacity (VC) of **>25-30%** when moving from a standing to a supine position is highly suggestive of bilateral weakness. * **Common Causes:** Motor neuron disease (ALS), bilateral phrenic nerve injury (post-cardiac surgery), and generalized myopathies [2]. * **Management:** Non-invasive ventilation (BiPAP) at night is the gold standard for managing the resulting nocturnal hypoventilation.

Question 490: Bronchiectasis with predominantly upper lobe involvement is characteristic of which condition?

A. Granulomatosis with polyangiitis
B. Hypogammaglobulinemia
C. Cystic fibrosis (Correct Answer)
D. Alpha-1 antitrypsin deficiency

Explanation: ### Explanation **Correct Answer: C. Cystic Fibrosis** **Why it is correct:** Bronchiectasis is the permanent dilation of bronchi due to a cycle of infection and inflammation. The anatomical distribution of bronchiectasis is a high-yield diagnostic clue. **Cystic Fibrosis (CF)** is the classic cause of **upper lobe predominant** bronchiectasis [1]. This occurs because the thick, inspissated mucus characteristic of CF leads to impaired mucociliary clearance, which is most pronounced in the upper lobes where ventilation-perfusion ratios and oxygen tension are higher, favoring the growth of pathogens like *Pseudomonas aeruginosa* [1]. **Analysis of Incorrect Options:** * **A. Granulomatosis with polyangiitis:** While it can cause pulmonary nodules, cavitations, and alveolar hemorrhage, it is not a primary cause of localized upper-lobe bronchiectasis. * **B. Hypogammaglobulinemia:** Immunodeficiency syndromes (like CVID) typically cause **lower lobe** bronchiectasis due to the effects of gravity on secretions and recurrent aspiration-like patterns of infection. * **D. Alpha-1 antitrypsin deficiency:** This condition characteristically causes **panacinar emphysema** with a marked predilection for the **lower lobes (basal distribution)**. **NEET-PG High-Yield Pearls:** * **Upper Lobe Bronchiectasis:** Cystic Fibrosis, ABPA (Allergic Bronchopulmonary Aspergillosis - usually central), and Tuberculosis (post-tubercular) [1]. * **Lower Lobe Bronchiectasis:** Post-infectious (viral/bacterial), Hypogammaglobulinemia, and Recurrent aspiration. * **Middle Lobe/Lingula:** Primary Ciliary Dyskinesia (Kartagener Syndrome) and MAC (*Mycobacterium avium* complex/Lady Windermere syndrome). * **Signet Ring Sign:** The classic radiological finding on HRCT where the dilated bronchus is larger than its accompanying pulmonary artery.

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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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