Pulmonology Practice Questions

Q: Bronchiectasis means which of the following changes in the bronchi?

Dilatation. **Explanation:** **Bronchiectasis** is defined as the **permanent and abnormal dilatation** of the bronchi and bronchioles [1]. This occurs due to the destruction of the muscular and elastic components of the bronchial walls, usually resulting from a cycle of chronic infection and inflammation (Cole’s "Vicious Cycle" hypothesis). * **Why Option B is Correct:** The hallmark pathological feature of bronchiectasis is the irreversible widening (dilatation) of the airways [1]. This leads to impaired mucociliary clearance, causing mucus to pool, which further predisposes the patient to recurrent infections [2]. * **Why Option A is Incorrect:** While inflammation is a key part of the *pathogenesis* (the process that leads to the disease), it is not the definition of the disease itself. Many conditions involve inflammation (e.g., bronchitis, asthma) without causing the structural dilatation seen in bronchiectasis. * **Why Option C is Incorrect:** Cavitation refers to the formation of a gas-filled space within a zone of pulmonary consolidation or a nodule (commonly seen in TB or lung abscess). While bronchiectasis can coexist with cavitary lesions, it is a tubular or cystic widening of existing airways, not the creation of new parenchymal cavities. **High-Yield Clinical Pearls for NEET-PG:** 1. **Clinical Triad:** Chronic cough, copious foul-smelling purulent sputum, and hemoptysis [1]. 2. **Gold Standard Investigation:** **HRCT (High-Resolution CT)** of the chest. 3. **Radiological Signs:** Look for the **"Signet Ring Sign"** (bronchus diameter > accompanying pulmonary artery) and **"Tram-track appearance"** (parallel thickened bronchial walls) [1]. 4. **Most Common Cause (Global):** Post-infectious (e.g., Tuberculosis, Measles, Pertussis) [2]. 5. **Specific Associations:** Kartagener Syndrome (Situs inversus + Bronchiectasis + Sinusitis) and Cystic Fibrosis (most common cause in the West) [2].

Q: Lower lung involvement is common in which of the following conditions?

Asbestosis. In pulmonology, the anatomical distribution of lung disease is a high-yield concept often tested via the "Upper vs. Lower Lobe" distinction. **1. Why Asbestosis is Correct:** Asbestosis is a form of pneumoconiosis caused by the inhalation of asbestos fibers. Unlike most other inorganic dusts, asbestos fibers preferentially deposit in the **lower lobes** and subpleural regions [1]. This is attributed to the gravity-dependent nature of fiber clearance and higher blood flow/ventilation in the lung bases. Over time, this leads to bibasilar end-inspiratory crackles [1] and characteristic pleural plaques. **2. Why the Other Options are Incorrect:** * **Tuberculosis (Option A):** Post-primary (reactivation) TB classically involves the **apical and posterior segments of the upper lobes**. This is because *Mycobacterium tuberculosis* is an obligate aerobe that thrives in the higher oxygen tension (higher V/Q ratio) found at the lung apices. * **Silicosis (Option C):** This pneumoconiosis typically involves the **upper lobes** [1]. It presents with small, rounded opacities and "eggshell calcification" of the hilar lymph nodes [1]. **Clinical Pearls for NEET-PG:** To remember the distribution of interstitial lung diseases (ILD) and pneumoconiosis, use these mnemonics: * **Upper Lobe Involvement (SET CHAI):** * **S**ilicosis * **E**xtrinsic Allergic Alveolitis (Hypersensitivity Pneumonitis - chronic) * **T**uberculosis * **C**oal Worker’s Pneumoconiosis [1] * **H**istiocytosis X (Langerhans Cell Histiocytosis) * **A**nkylosing Spondylitis * **I**diopathic Pulmonary Fibrosis (Exception: IPF is lower lobe; this mnemonic refers to Sarcoidosis/others). *Correction: Use **BREAST** for Upper Lobe: Berylliosis, Radiation, EAA, Ankylosing Spondylitis, Sarcoidosis, TB/Silicosis.* * **Lower Lobe Involvement (BAD):** * **B**ronchiectasis * **A**sbestosis [1] * **D**IP/IPF (Idiopathic Pulmonary Fibrosis)

Q: Caplan's syndrome is seen in which of the following conditions?

Pneumoconiosis. **Explanation:** **Caplan’s Syndrome** (also known as Rheumatoid Pneumoconiosis) is a clinical entity characterized by the coexistence of **Rheumatoid Arthritis (RA)** and **Pneumoconiosis**, most commonly seen in coal miners (Coal Worker's Pneumoconiosis) [1]. 1. **Why Pneumoconiosis is correct:** The syndrome manifests as multiple, well-defined "Caplan nodules" (0.5 to 5 cm in diameter) in the periphery of the lungs. These nodules develop rapidly in patients with a background of inorganic dust exposure (coal, silica, or asbestos) who also have or will develop rheumatoid arthritis [1, 3]. The underlying pathophysiology involves an exaggerated inflammatory response to dust particles in an individual with a pre-existing hyper-reactive immune system (rheumatoid diathesis) [2]. 2. **Why other options are incorrect:** * **COPD:** Characterized by chronic airflow obstruction (emphysema/bronchitis) due to smoking or biomass fuel; it does not typically present with rheumatoid-associated nodules. * **Pulmonary Edema:** This is a result of fluid accumulation in the alveoli (usually due to heart failure), presenting with diffuse opacities and Kerley B lines, not discrete nodules. * **Bronchial Asthma:** An inflammatory airway disease causing reversible bronchoconstriction; it does not involve the lung parenchyma or dust-related nodule formation [1, 5]. **High-Yield Clinical Pearls for NEET-PG:** * **Classic Triad:** Pneumoconiosis + Rheumatoid Arthritis + Multiple Pulmonary Nodules [1, 3]. * **Radiology:** Nodules are typically bilateral, peripheral, and may undergo cavitation or calcification [1]. * **Most Common Dust:** Coal dust is the most frequent association, but it can also occur with **Silicosis** and **Asbestosis** [1]. * **Distinction:** Unlike Progressive Massive Fibrosis (PMF), Caplan nodules can appear even with minimal dust exposure and often precede the onset of joint symptoms [2].

Q: Which of the following are non-metastatic manifestations of carcinoma of the lung?

Cushing syndrome. **Explanation:** The question refers to **Paraneoplastic Syndromes (PNS)**, which are signs and symptoms occurring at sites distant from a tumor or its metastasis [1]. These are "non-metastatic" manifestations caused by the ectopic production of hormones, peptides, or cytokines by tumor cells [4]. **Why Cushing Syndrome is Correct:** Cushing syndrome is a classic paraneoplastic manifestation of **Small Cell Lung Carcinoma (SCLC)** [1]. It occurs due to the ectopic production of **ACTH (Adrenocorticotropic Hormone)** [3]. This leads to bilateral adrenal hyperplasia and excess cortisol production, presenting clinically with hypertension, hypokalemia, and metabolic alkalosis (often more rapidly progressive than pituitary-based Cushing’s). **Analysis of Incorrect Options:** * **Diabetes Mellitus:** While chronic steroid excess (from Cushing’s) can cause secondary hyperglycemia, DM itself is not considered a specific paraneoplastic syndrome of lung cancer. * **Carcinoid Syndrome:** Although bronchial carcinoids exist, classic carcinoid syndrome (flushing, diarrhea) is rare unless there are massive liver metastases. It is not a standard paraneoplastic feature of primary lung adenocarcinoma or squamous cell carcinoma. * **Jaundice:** This is typically a **metastatic** manifestation, occurring due to liver involvement (hepatic metastases) or biliary obstruction, rather than a paraneoplastic process [2]. **NEET-PG High-Yield Pearls:** 1. **Small Cell Carcinoma (SCLC):** Associated with ACTH (Cushing’s), SIADH (hyponatremia), and Lambert-Eaton Myasthenic Syndrome [4]. 2. **Squamous Cell Carcinoma:** Associated with **PTHrP** (Parathyroid Hormone-related Protein) leading to **Hypercalcemia**. (Mnemonic: **S**quamous = **S**tones/Calcium) [1]. 3. **Adenocarcinoma:** Associated with Hypertrophic Osteoarthropathy (HOA) and Digital Clubbing [2]. 4. **Large Cell Carcinoma:** Associated with Gynecomastia.

Q: Cavitation is most often seen in which type of pneumonia?

Tuberculous pneumonia. **Explanation:** **Correct Answer: B. Tuberculous pneumonia** Cavitation is a hallmark of **Tuberculous pneumonia**, particularly in post-primary (reactivation) tuberculosis [1]. The underlying mechanism is **caseous necrosis**, where a cell-mediated immune response (Type IV hypersensitivity) leads to tissue destruction [1]. When this necrotic material liquefies and drains into the bronchial tree, it leaves behind a gas-filled cavity. These cavities are typically thick-walled and located in the upper lobes (apical/posterior segments) due to higher oxygen tension [1], [4]. **Analysis of Incorrect Options:** * **A. Mycoplasma pneumonia:** Known as "Atypical Pneumonia," it typically presents with interstitial infiltrates and "reticulonodular" patterns. Cavitation is extremely rare. * **C. Streptococcal pneumonia:** *Streptococcus pneumoniae* is the most common cause of community-acquired pneumonia (lobar pattern). It is non-necrotizing; therefore, it rarely causes cavitation or permanent lung scarring [3]. * **D. Staphylococcal pneumonia:** While *Staphylococcus aureus* is a well-known cause of necrotizing pneumonia and can cause **pneumatoceles** (thin-walled, air-filled cysts) or abscesses, it is statistically less frequent than Tuberculosis in the context of chronic cavitary lesions in the Indian subcontinent. **NEET-PG High-Yield Pearls:** * **Most common cause of cavitation globally:** Tuberculosis [1]. * **Most common cause of cavitation in Acute Pneumonia:** *Staphylococcus aureus* and *Klebsiella pneumoniae* (Friedlander’s pneumonia). * **Pneumatoceles:** Characteristically seen in Pediatric Staphylococcal pneumonia. * **Air-fluid levels:** If seen within a cavity, suspect a lung abscess or superinfected TB cavity [2], [4]. * **Bulging Fissure Sign:** Classically associated with *Klebsiella* pneumonia.

Q: Which of the following conditions can present with necrotic lung nodules on chest X-ray?

All of the above. **Explanation:** The presence of **necrotic (cavitating) lung nodules** on imaging is a significant clinical finding that narrows the differential diagnosis to specific infectious, inflammatory, and neoplastic processes. 1. **Tuberculosis (TB):** This is the most common cause of necrotic lung lesions in India. TB typically causes **caseating necrosis**. While classic TB presents as upper lobe infiltrates with cavitation, it can also manifest as multiple nodules that undergo central necrosis and cavitation, especially in post-primary TB or immunocompromised states. [1] 2. **Rheumatoid Arthritis (RA):** Pulmonary involvement in RA can manifest as **necrobiotic nodules**. These are pathologically identical to subcutaneous nodules (central fibrinoid necrosis surrounded by palisading macrophages). They are typically peripheral, multiple, and frequently undergo cavitation (Caplan’s Syndrome when associated with coal worker's pneumoconiosis). [2] 3. **Sarcoidosis:** Although sarcoidosis is characterized by **non-caseating granulomas**, a rare variant known as **"Necrotizing Sarcoid Granulomatosis" (NSG)** exists. In this form, the granulomatous nodules undergo extensive necrosis and can appear as cavitating nodules on a chest X-ray. [1] **Clinical Pearls for NEET-PG:** * **Mnemonic for Cavitating Lung Lesions (CAVITY):** **C**ancer (SCC), **A**utoimmune (Wegener’s/GPA, RA), **V**ascular (Septic emboli), **I**nfection (TB, Fungal/Aspergillosis, Abscess), **T**rauma, **Y**outh (CPAM/Sequestration). * **Squamous Cell Carcinoma** is the most common bronchogenic carcinoma to cavitate. [1] * **Granulomatosis with Polyangiitis (Wegener’s)** is a high-yield differential for multiple bilateral necrotic nodules associated with renal involvement (c-ANCA positive). [1]

Question 1

Exercise-induced asthma is not precipitated by which of the following?

Accepted Answer

Swimming in hot water

Answer

High altitude climb and exercise

Answer

Cycling in cold weather

Answer

Swimming in cold water

Question 2

What is the most common cause of empyema?

Accepted Answer

Bacterial pneumonia

Answer

Bronchopleural fistula

Answer

Tubercular pneumonia

Answer

Pleurisy

Question 3

All are true regarding pneumoconioses EXCEPT:

Accepted Answer

Centrilobular emphysema is seen in pneumoconioses

Answer

Caplan's syndrome is seen in all types of pneumoconioses

Answer

'Eggshell' calcification is seen in silicosis

Answer

Asbestosis is treated with corticosteroids

Question 4

Bronchiectasis means which of the following changes in the bronchi?

Accepted Answer

Dilatation

Answer

Inflammation

Answer

Cavitation

Answer

All of the above

Question 5

Lower lung involvement is common in which of the following conditions?

Accepted Answer

Asbestosis

Answer

Tuberculosis

Answer

Silicosis

Answer

All of the above

Question 6

Caplan's syndrome is seen in which of the following conditions?

Accepted Answer

Pneumoconiosis

Answer

COPD

Answer

Pulmonary edema

Answer

Bronchial asthma

Question 7

A 60-year old male with a long-standing history of breathlessness and a heavy smoking history since age 20 presents with an anxious, emaciated appearance, puffing for breath without cyanosis, and a barrel-shaped chest. What is the investigation of choice for this patient?

Accepted Answer

High-resolution CT

Answer

Contrast-enhanced CT

Answer

Plain skiagram of the chest

Answer

Ultrasound test

Question 8

Which of the following are non-metastatic manifestations of carcinoma of the lung?

Accepted Answer

Cushing syndrome

Answer

Diabetes mellitus

Answer

Carcinoid syndrome

Answer

Jaundice

Question 9

Cavitation is most often seen in which type of pneumonia?

Accepted Answer

Tuberculous pneumonia

Answer

Mycoplasma pneumonia

Answer

Streptococcal pneumonia

Answer

Staphylococcal pneumonia

Question 10

Which of the following conditions can present with necrotic lung nodules on chest X-ray?

Accepted Answer

All of the above

Answer

Tuberculosis (TB)

Answer

Rheumatoid Arthritis (RA)

Answer

Sarcoidosis

Pulmonology — MCQs

Pulmonology — MCQs

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