Pulmonology Practice Questions

Q: A 78-year-old woman with a history of stroke presents with poor appetite and confusion. A chest X-ray reveals a left lower lobe infiltrate. Blood cultures are positive for S pneumoniae sensitive to penicillin. Which of the following is the most likely complication of pneumococcal pneumonia?

Empyema. **Explanation:** **1. Why Empyema is the Correct Answer:** *Streptococcus pneumoniae* is the most common cause of community-acquired pneumonia (CAP). The most frequent complication of pneumococcal pneumonia is a **parapneumonic effusion**, occurring in up to 40% of cases [2]. If this fluid becomes infected or develops into a loculated collection of pus, it is termed **empyema** [1]. While the incidence of empyema has decreased in the antibiotic era, it remains the most common "local" complication of the disease, especially in elderly patients with comorbidities. **2. Analysis of Incorrect Options:** * **A. Peritonitis:** While *S. pneumoniae* can cause primary peritonitis (classically in patients with nephrotic syndrome or cirrhosis), it is a rare complication of pneumonia in the general population. * **C. Pericarditis:** Purulent pericarditis is a severe but rare complication, usually occurring via direct extension from an adjacent lung focus or via hematogenous spread. * **D. Endocarditis:** Pneumococcal endocarditis is now rare (<1% of cases). It typically involves the aortic valve and is classically associated with the **Austrian Syndrome** (the triad of pneumonia, meningitis, and endocarditis). **3. NEET-PG High-Yield Pearls:** * **Most common complication overall:** Parapneumonic effusion (Empyema is the most common *purulent* complication). * **Austrian Syndrome:** Triad of *S. pneumoniae* pneumonia, meningitis, and endocarditis (usually aortic valve). * **Risk Factors:** Alcoholism, splenectomy (asplenia), and COPD are major risk factors for severe pneumococcal disease. * **Diagnosis:** The "Rusty sputum" is a classic (though not always present) clinical sign of pneumococcal pneumonia [3]. * **Vaccination:** PPSV23 (polysaccharide) and PCV13 (conjugate) are key preventive measures for the elderly and immunocompromised.

Q: What is the typical feature of interstitial lung disease?

End inspiratory rales. ### Explanation **Interstitial Lung Disease (ILD)** is characterized by progressive fibrosis and thickening of the alveolar walls, leading to decreased lung compliance (stiff lungs) [1]. **Why "End-inspiratory rales" is correct:** The hallmark physical finding in ILD is **fine, dry, "Velcro-like" end-inspiratory crackles (rales)** [1]. These occur because, during inspiration, the high negative intrapleural pressure forces open small, stiff airways and collapsed alveoli that were held shut by fibrotic tissue. This sudden "popping open" at the peak of inspiration creates the characteristic sound, typically heard first at the lung bases. **Analysis of Incorrect Options:** * **Expiratory rales:** Rales are predominantly an inspiratory phenomenon [1]. Expiratory crackles are rare and usually associated with severe obstructive diseases (like bronchiectasis) rather than classic ILD. * **Inspiratory/Expiratory rhonchi:** Rhonchi are low-pitched, snoring sounds caused by secretions or narrowing in the **large airways** (e.g., bronchitis). ILD primarily affects the **parenchyma and interstitium**, not the large conducting airways. * **Expiratory wheeze (rhonchi):** This is the hallmark of obstructive airway diseases like Asthma or COPD, where air is trapped during expiration due to bronchospasm or airway collapse. **High-Yield Clinical Pearls for NEET-PG:** * **Clubbing:** Frequently seen in Idiopathic Pulmonary Fibrosis (IPF) but rare in sarcoidosis [1]. * **PFT Pattern:** Restrictive lung disease (Decreased TLC, Decreased FVC, but a **Normal or Increased FEV1/FVC ratio**) [1]. * **DLCO:** Characteristically **decreased** in ILD due to the thickened alveolar-capillary membrane [1]. * **HRCT Gold Standard:** Look for "honeycombing" and "traction bronchiectasis" in advanced cases [1].

Q: Which organ's primary involvement is not reported to be affected by sarcoidosis?

Adrenals. Detailed Explanation of Sarcoidosis Clinical Features Sarcoidosis is a multisystem, chronic inflammatory disease characterized by the formation of **non-caseating granulomas**. While it can affect almost any organ system, its distribution is not uniform [1]. **1. Why Adrenals (Correct Answer) is right:** The **adrenal glands** are classically spared in sarcoidosis. While the disease frequently involves the lymph nodes, lungs, liver, and eyes, primary adrenal involvement or adrenal insufficiency (Addison’s disease) is extremely rare and generally not reported as a standard clinical feature of the disease. In contrast, other granulomatous diseases like Tuberculosis or Histoplasmosis frequently involve the adrenals [2]. **2. Why other options are wrong:** * **Heart (Option A):** Cardiac sarcoidosis occurs in about 5-25% of patients. It typically presents with conduction blocks, arrhythmias, or heart failure and is a significant cause of mortality [1]. * **Kidney (Option C):** Renal involvement occurs primarily through disordered calcium metabolism (hypercalciuria and hypercalcemia) leading to nephrocalcinosis or kidney stones [1]. Direct granulomatous interstitial nephritis can also occur. * **Brain (Option D):** Known as **Neurosarcoidosis**, it affects approximately 5-10% of patients. The most common manifestation is cranial nerve palsies (especially Facial Nerve/CN VII) [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Most common organ involved:** Lungs (>90%) [3]. * **Most common cranial nerve involved:** Facial nerve (CN VII) [1]. * **Lofgren’s Syndrome:** Triad of Erythema nodosum, bilateral hilar adenopathy, and polyarthritis (Good prognosis) [1]. * **Heerfordt’s Syndrome:** Uveitis, parotid enlargement, and facial palsy. * **Biochemical marker:** Elevated Serum ACE (Angiotensin-Converting Enzyme) levels.

Q: Which of the following conditions is most commonly associated with a left-sided pleural effusion?

Pancreatitis. **Explanation:** The correct answer is **Pancreatitis**. Pleural effusion in acute pancreatitis occurs in approximately 15–20% of cases. It is typically **left-sided** because the tail of the pancreas lies in close proximity to the left diaphragm [1]. Inflammatory exudate and pancreatic enzymes reach the pleural space via transdiaphragmatic lymphatics or through direct fistulous tracts (pancreaticopleural fistula), leading to an exudative effusion with high amylase levels [1]. **Analysis of Incorrect Options:** * **Rheumatoid Arthritis:** While it can cause a left-sided effusion, it is more commonly **unilateral (either side)** or bilateral. It is classically associated with very low glucose levels and high LDH. * **Hypoproteinemia:** Conditions like nephrotic syndrome or cirrhosis cause **bilateral** transudative effusions due to decreased oncotic pressure. If unilateral, it more frequently involves the right side. * **Congestive Cardiac Failure (CCF):** This is the most common cause of pleural effusion overall. It typically presents as **bilateral** effusions. If unilateral, it is significantly more common on the **right side**. **NEET-PG High-Yield Pearls:** * **Right-sided effusions:** Associated with CCF (if unilateral), Liver Cirrhosis (Hepatic Hydrothorax), and Meigs’ Syndrome. * **Left-sided effusions:** Associated with Pancreatitis, Boerhaave syndrome (esophageal rupture), and Splenic infarction. * **Diagnostic Marker:** A pleural fluid amylase level higher than the serum amylase level is highly suggestive of pancreatitis, esophageal rupture, or malignancy.

Q: A 50-year-old patient with long-standing chronic obstructive lung disease develops insidious onset of aching in the distal extremities, particularly the wrists bilaterally. There is a 9 kg weight loss. The skin over the wrists is warm and erythematous. There is bilateral clubbing. Plain film shows periosteal thickening, suggestive of osteomyelitis. What is the next best step in management?

Obtain chest x-ray. ### Explanation The clinical presentation of bilateral distal extremity pain, warmth, erythema, and clubbing in a patient with a history of lung disease and significant weight loss is classic for **Hypertrophic Osteoarthropathy (HOA)** [1]. **1. Why "Obtain chest x-ray" is correct:** The patient is exhibiting **Hypertrophic Pulmonary Osteoarthropathy (HPOA)**, a subset of HOA. While HPOA can be associated with chronic lung diseases (like COPD/Bronchiectasis), the **insidious onset of weight loss (9 kg)** in a 50-year-old smoker is a major "red flag" for **Bronchogenic Carcinoma** (most commonly Adenocarcinoma). The "periosteal thickening" seen on X-ray is the hallmark of HPOA, not infection. A chest X-ray is the most appropriate next step to screen for an underlying malignancy, which often triggers this paraneoplastic syndrome. **2. Why other options are incorrect:** * **A & C (Ciprofloxacin/Aspiration):** These are treatments for osteomyelitis or septic arthritis. While the X-ray mentioned "suggestive of osteomyelitis," the **bilateral, symmetrical** involvement [1] and presence of **clubbing** strongly point toward a systemic/paraneoplastic process rather than a localized infection. * **D (Gold therapy):** This was historically used for Rheumatoid Arthritis (RA). While HOA can mimic RA, the presence of clubbing and the periosteal reaction on X-ray are not features of RA. **3. High-Yield Clinical Pearls for NEET-PG:** * **Triad of HPOA:** Digital clubbing, symmetrical arthritis/arthralgia, and periostitis of distal long bones. * **Most common cause:** Primary lung malignancy (Adenocarcinoma is the most frequent association). * **Radiological Hallmark:** "Tram-track" sign or periosteal new bone formation along the shafts of long bones (distal tibia, fibula, radius, ulna). * **Management:** The definitive treatment for HPOA is treating the underlying cause [1]. NSAIDs can be used for symptomatic relief [1].

Q: A 25-year-old female presents with progressive dyspnea for one year. CXR shows interstitial opacities and spirometry shows an obstructive pattern. What is the diagnosis?

Pulmonary Lymphangioleiomyomatosis. ### **Explanation** The correct answer is **Pulmonary Lymphangioleiomyomatosis (LAM)**. **Why it is correct:** LAM is a rare cystic lung disease that almost exclusively affects **young females** of childbearing age. It is characterized by the proliferation of atypical smooth muscle cells (LAM cells) around airways, blood vessels, and lymphatics. * **The Paradox:** While most interstitial lung diseases (ILDs) present with a restrictive pattern [1], LAM is a classic exception. The proliferation of smooth muscle cells leads to airway obstruction and air trapping, resulting in an **obstructive pattern** on spirometry. * **Radiology:** CXR shows interstitial opacities [1], but HRCT is diagnostic, showing characteristic thin-walled, diffuse, bilateral **round cysts**. **Why other options are incorrect:** * **A & C (NSIP and IPF):** These are typical Interstitial Lung Diseases. They present with a **restrictive pattern** (decreased FVC, increased FEV1/FVC ratio) [1] rather than an obstructive one. IPF is also more common in older males. * **D (Pulmonary Alveolar Proteinosis):** This presents with a "Crazy Paving" pattern on HRCT and typically shows a **restrictive or normal** spirometry pattern [2]. **High-Yield Clinical Pearls for NEET-PG:** 1. **Obstructive Pattern in ILD:** Remember the mnemonic **"LCH"** (LAM, Langerhans Cell Histiocytosis, and Sarcoidosis/Hypersensitivity Pneumonitis in some stages). 2. **Associations:** LAM is strongly associated with **Tuberous Sclerosis Complex (TSC)** and renal **Angiomyolipomas**. 3. **Complications:** Recurrent pneumothorax and chylous pleural effusion are common. 4. **Biomarker:** Elevated **VEGF-D** levels are highly specific for LAM. 5. **Treatment:** Sirolimus (mTOR inhibitor) is the drug of choice.

Q: Comment on the diagnosis based on spirometry findings: TLC = 75% of predicted, FRC = 100% of predicted, RV = 120% of predicted, FEV1 = 60% of predicted, DLco = 80% of predicted.

Myasthenia gravis. ### **Explanation** This question tests the ability to differentiate between obstructive, restrictive, and neuromuscular patterns using lung volumes and DLco. **1. Why Myasthenia Gravis is correct:** Myasthenia Gravis (MG) causes **extrapulmonary restrictive lung disease** due to respiratory muscle weakness. * **TLC (75%):** Reduced, indicating a restrictive pattern. * **RV (120%) & FRC (100%):** In neuromuscular disorders, the muscles of expiration are weak, preventing the patient from exhaling fully. This leads to an **increased Residual Volume (RV)** despite a low Total Lung Capacity (TLC). * **DLco (80%):** Normal. Since the lung parenchyma and vasculature are intact, gas exchange remains unaffected. This "normal DLco with low TLC" is a classic hallmark of neuromuscular or chest wall disorders. **2. Why the other options are wrong:** * **Acute Asthma:** This is an obstructive disease. You would expect a decreased FEV1/FVC ratio and an increased TLC/FRC due to air trapping, not a reduced TLC [1]. * **Emphysema:** While RV is increased due to air trapping, the **DLco is characteristically decreased** due to alveolar wall destruction. TLC is typically increased (hyperinflation). * **Pulmonary Fibrosis:** This is an intrapulmonary restrictive disease. While TLC is low, the **RV is also decreased** (the "shrunken lung"), and **DLco is significantly reduced** due to the thickened alveolar-capillary membrane [2]. **3. Clinical Pearls for NEET-PG:** * **Neuromuscular Pattern:** ↓ TLC + ↑ RV + Normal DLco. * **Parenchymal Restrictive (Fibrosis):** ↓ TLC + ↓ RV + ↓ DLco [2]. * **Obstructive (Emphysema):** ↑ TLC + ↑ RV + ↓ DLco. * **MIP and MEP:** In suspected Myasthenia Gravis, the most sensitive bedside tests for respiratory involvement are **Maximal Inspiratory Pressure (MIP)** and **Maximal Expiratory Pressure (MEP)**.

Question 1

A 78-year-old woman with a history of stroke presents with poor appetite and confusion. A chest X-ray reveals a left lower lobe infiltrate. Blood cultures are positive for S pneumoniae sensitive to penicillin. Which of the following is the most likely complication of pneumococcal pneumonia?

Accepted Answer

Empyema

Answer

Peritonitis

Answer

Pericarditis

Answer

Endocarditis

Question 2

What is the typical feature of interstitial lung disease?

Accepted Answer

End inspiratory rales

Answer

Expiratory rales

Answer

Inspiratory rhonchi

Answer

Expiratory rhonchi

Question 3

Which organ's primary involvement is not reported to be affected by sarcoidosis?

Accepted Answer

Adrenals

Answer

Heart

Answer

Kidney

Answer

Brain

Question 4

Which of the following conditions is most commonly associated with a left-sided pleural effusion?

Accepted Answer

Pancreatitis

Answer

Rheumatoid arthritis

Answer

Hypoproteinemia

Answer

Congestive cardiac failure

Question 5

A 60-year-old obese male with a history of chronic smoking presents to the ICU with a pelvic fracture. On the 4th day of ICU stay, he develops sudden tachypnea, decreased SpO2, and hypotension. Echocardiography reveals right ventricular dilation and tricuspid regurgitation. What is the most appropriate next step in management?

Accepted Answer

Systemic thrombolysis

Answer

D-dimer assay

Answer

Administration of heparin

Answer

Pericardiocentesis

Question 6

Profuse expectoration of two months duration and clubbing may be seen in which of the following conditions?

Accepted Answer

Allergic bronchopulmonary aspergillosis

Answer

Sarcoidosis

Answer

Polyarteritis nodosa

Answer

Pulmonary artery hypertension

Question 7

A 50-year-old patient with long-standing chronic obstructive lung disease develops insidious onset of aching in the distal extremities, particularly the wrists bilaterally. There is a 9 kg weight loss. The skin over the wrists is warm and erythematous. There is bilateral clubbing. Plain film shows periosteal thickening, suggestive of osteomyelitis. What is the next best step in management?

Accepted Answer

Obtain chest x-ray

Answer

Start ciprofloxacin

Answer

Aspirate both wrists

Answer

Begin gold therapy

Question 8

A 25-year-old female presents with progressive dyspnea for one year. CXR shows interstitial opacities and spirometry shows an obstructive pattern. What is the diagnosis?

Accepted Answer

Pulmonary Lymphangioleiomyomatosis

Answer

Non-specific interstitial pneumonitis

Answer

Idiopathic pulmonary fibrosis

Answer

Pulmonary Alveolar Proteinosis

Question 9

A 56-year-old man presents with a non-productive cough for 4 weeks. The most noticeable signs were grade III clubbing and a lesion in the apical lobe on X-ray. What is the most likely diagnosis?

Accepted Answer

Non-small cell carcinoma

Answer

Small cell carcinoma

Answer

Cryptococcal pneumonia

Answer

Tuberculosis

Question 10

Comment on the diagnosis based on spirometry findings: TLC = 75% of predicted, FRC = 100% of predicted, RV = 120% of predicted, FEV1 = 60% of predicted, DLco = 80% of predicted.

Accepted Answer

Myasthenia gravis

Answer

Acute asthma

Answer

Emphysema

Answer

Pulmonary fibrosis

Pulmonology — MCQs

Pulmonology — MCQs

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