Occupational Lung Diseases — MCQs
A disease associated with prolonged exposure to silica dust during glass production, characterized by classic X-ray findings of calcified lymph nodes and pleural involvement, is most likely what disease?
"Farmer's Lung" is due to inhalation of -
A 50 year old male presents with fever and malaise for 4 months and pain in the knees and ankles. Blood tests are normal apart from a raised ESR. Chest x-ray shows bilateral hilar adenopathy and pulmonary infiltrates most severe in the upper and mid zones. Mantoux test is negative. What is the most likely diagnosis?
Mesothelioma is closely associated with which of the following?
Which of the following conditions does not primarily benefit from secondary level prevention?
Sputum examination for AFB is a type of
A 45-year-old male presents with chronic cough and shortness of breath. Chest X-ray reveals multiple pulmonary nodules with 'egg-shell' calcification. Which of the following is the most likely diagnosis?
A lady presents with complaints of hemoptysis, and her chest X-ray appears to be normal. What is the next best investigation?
A 40-year-old male presents with tachypnea. Examination reveals a respiratory rate of 32/min, pulmonary hypertension, blood pressure of 132/90 mmHg, and elevated JVP. What is the most likely cause of these findings?
All of the following are features of interstitial lung disease except which one?
Occupational Lung Diseases Indian Medical PG Practice Questions and MCQs
Question 1: A disease associated with prolonged exposure to silica dust during glass production, characterized by classic X-ray findings of calcified lymph nodes and pleural involvement, is most likely what disease?
- A. Byssinosis
- B. Berylliosis
- C. Silicosis (Correct Answer)
- D. Anthracosis
Explanation: ***Silicosis*** [1][2] - Prolonged exposure to **silica dust** during glass production leads to characteristic **X-ray findings** of calcified lymph nodes and an "eggshell" pattern. - Associated with **pleural involvement** resulting in fibrous plaques and a greater risk of developing **tuberculosis** [3]. *Anthracosis* [2] - Caused by exposure to **coal dust**, not silica, and primarily affects the **upper lobes** of the lungs. - X-ray findings do not show the classic "eggshell" pattern; they are primarily concerned with **black lung disease** changes. *Berylliosis* [2] - Results from exposure to **beryllium dust**, typically presenting with **granulomatous lung disease** rather than an eggshell pattern. - Less common and does not show significant pleural changes as seen in silicosis. *Byssinosis* - Associated with the inhalation of **cotton dust**, leading to respiratory issues, but lacks the calcified nodules characteristic of silicosis. - Symptoms often improve over a weekend, differentiating it from silicosis. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, p. 697. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, p. 695. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, pp. 697-698.
Question 2: "Farmer's Lung" is due to inhalation of -
- A. Hay dust (Correct Answer)
- B. Coal dust
- C. Cotton fiber
- D. Sugarcane fiber
Explanation: ***Hay dust*** - Farmer's Lung is a form of **hypersensitivity pneumonitis** caused by the inhalation of **moldy hay dust**. - The dust contains thermophilic actinomycetes (e.g., *Saccharopolyspora rectivirgula*), which trigger an **immune response** in sensitized individuals. *Coal dust* - Inhalation of **coal dust** causes **Coal Workers' Pneumoconiosis** (CWP), a well-known occupational lung disease. - CWP manifests as **fibrosis** and inflammation in the lungs, distinct from the hypersensitivity reaction seen in Farmer's Lung. *Cotton fiber* - Inhalation of **cotton dust** can lead to **byssinosis**, a type of occupational lung disease often called "brown lung." - Byssinosis typically presents with chest tightness and shortness of breath, particularly at the beginning of the work week, but it is not Farmer's Lung. *Sugarcane fiber* - Inhalation of **sugarcane fiber** (bagasse) causes a condition known as **bagassosis**, which is another form of hypersensitivity pneumonitis. - While similar to Farmer's Lung in mechanism, the specific antigen involved is from sugarcane rather than moldy hay.
Question 3: A 50 year old male presents with fever and malaise for 4 months and pain in the knees and ankles. Blood tests are normal apart from a raised ESR. Chest x-ray shows bilateral hilar adenopathy and pulmonary infiltrates most severe in the upper and mid zones. Mantoux test is negative. What is the most likely diagnosis?
- A. Tuberculosis
- B. Sarcoidosis (Correct Answer)
- C. Asbestosis
- D. Berylliosis
Explanation: ***Sarcoidosis*** - The constellation of **bilateral hilar adenopathy**, pulmonary infiltrates (especially in upper/mid zones), **arthralgia** (knees and ankles), and a **negative Mantoux test** in a patient with unexplained fever and malaise is highly suggestive of sarcoidosis [1]. - A **raised ESR** is a non-specific inflammatory marker often seen in sarcoidosis. *Tuberculosis* - While tuberculosis can cause fever, malaise, pulmonary infiltrates, and elevated ESR, a **negative Mantoux test** makes primary or active tuberculosis less likely in an immunocompetent individual. - **Bilateral hilar adenopathy** is also less typical of primary pulmonary tuberculosis compared to sarcoidosis. *Asbestosis* - This is an **occupational lung disease** caused by asbestos exposure, primarily presenting with **progressive dyspnea** and **restrictive lung disease**. - It characteristically involves the **lower lobes**, causes **pleural plaques**, and is not typically associated with acute arthralgia, fever, or prominent hilar adenopathy. *Berylliosis* - This is another **occupational lung disease** resulting from beryllium exposure, often mimicking sarcoidosis both clinically and pathologically [2]. - However, without a history of **beryllium exposure** and given the classic presentation, sarcoidosis is a more prevalent default diagnosis [2].
Question 4: Mesothelioma is closely associated with which of the following?
- A. Silicosis
- B. Anthracosis
- C. Byssinosis
- D. Asbestosis (Correct Answer)
Explanation: ***Asbestosis*** - Mesothelioma is a rare but aggressive cancer of the **pleura** or **peritoneum**, and its strongest known etiological link is with **asbestos exposure**. - Asbestos fibers can become lodged in the lungs and pleural lining, leading to chronic inflammation, DNA damage, and eventually oncogenic transformation. *Silicosis* - **Silicosis** is a lung disease caused by inhaling **crystalline silica dust**, primarily affecting miners, construction workers, and foundry workers. - While it can lead to pulmonary fibrosis and an increased risk of tuberculosis and lung cancer, it is not directly associated with mesothelioma. *Anthracosis* - **Anthracosis** is often seen in coal miners and urban dwellers due to the inhalation of **carbon dust**, leading to the accumulation of pigment in the lungs. - This condition is generally benign but can contribute to the development of **coal worker's pneumoconiosis**, which is distinct from mesothelioma. *Byssinosis* - **Byssinosis** is an occupational lung disease caused by the inhalation of **cotton dust** or other textile dusts, typically affecting textile workers. - Symptoms include chest tightness and shortness of breath, particularly after beginning work after a break, and it is unrelated to mesothelioma.
Question 5: Which of the following conditions does not primarily benefit from secondary level prevention?
- A. Coronary heart disease
- B. Leprosy
- C. TB
- D. None of the options (Correct Answer)
Explanation: ***None of the options*** - This is the **correct answer** because all three conditions listed (Coronary heart disease, TB, and Leprosy) DO significantly benefit from **secondary prevention** strategies. - The question uses negation ("does not"), asking which condition does NOT benefit from secondary prevention. - Since all three diseases benefit from secondary prevention, the answer is "None of the options." **Why each condition DOES benefit from secondary prevention:** *Coronary Heart Disease (CHD)* - **Secondary prevention** includes screening for risk factors (hypertension, hyperlipidemia, diabetes), early detection through ECG and cardiac biomarkers, and prompt intervention. - Post-event management with antiplatelets, statins, beta-blockers, and lifestyle modifications prevents recurrence and reduces mortality. - Early detection and treatment of risk factors halt disease progression and prevent complications. *Tuberculosis (TB)* - **Secondary prevention** is crucial through **early case detection** (contact tracing, active case finding, screening high-risk populations) and **prompt initiation of antitubercular therapy**. - Early diagnosis via sputum microscopy, GeneXpert, and chest X-ray prevents disease progression, reduces transmission, and prevents complications like miliary TB or TB meningitis. - Timely treatment ensures cure and prevents development of drug resistance. *Leprosy* - **Secondary prevention** involves **active case detection through surveys** and **prompt multi-drug therapy (MDT)**. - Early diagnosis and treatment prevent irreversible nerve damage, deformities, and disabilities. - Reduces transmission in the community and prevents progression to advanced stages.
Question 6: Sputum examination for AFB is a type of
- A. Tertiary prevention
- B. Primordial prevention
- C. Secondary prevention (Correct Answer)
- D. Primary prevention
Explanation: ***Secondary prevention*** - **Sputum examination for AFB** (acid-fast bacilli) aims for **early diagnosis** and **prompt treatment** of tuberculosis. - This level of prevention focuses on **halting the progression of a disease** that has already occurred or reducing its severity. *Tertiary prevention* - This level of prevention involves **rehabilitation** and preventing complications in individuals with **established disease**. - Examples include physical therapy after a stroke or managing chronic conditions to improve quality of life. *Primordial prevention* - This stage of prevention focuses on **preventing the emergence of risk factors** in the first place, often by addressing broad socioeconomic and environmental determinants. - It targets the entire population and is concerned with **social and environmental conditions** that contribute to risk factors. *Primary prevention* - This level of prevention aims to **prevent the onset of disease** by reducing exposure to risk factors or increasing resistance to disease. - Examples include **vaccination**, health education, and promoting healthy lifestyles to **prevent initial disease occurrence**.
Question 7: A 45-year-old male presents with chronic cough and shortness of breath. Chest X-ray reveals multiple pulmonary nodules with 'egg-shell' calcification. Which of the following is the most likely diagnosis?
- A. Bronchogenic carcinoma
- B. Tuberculosis
- C. Silicosis (Correct Answer)
- D. Sarcoidosis
Explanation: ***Silicosis*** - The combination of **chronic cough**, **shortness of breath**, and chest X-ray findings of **multiple pulmonary nodules with "egg-shell" calcification** is highly characteristic of silicosis. - **Egg-shell calcification** refers to calcification of the hilar and mediastinal lymph nodes, a classic radiological sign of this occupational lung disease. *Bronchogenic carcinoma* - While it can cause chronic cough and shortness of breath, **pulmonary nodules** due to lung cancer typically do not exhibit **egg-shell calcification**. - Its presentation is often associated with risk factors like **smoking**, and may include **hemoptysis** or **weight loss**. *Tuberculosis* - Tuberculosis can cause chronic cough and pulmonary nodules, but **egg-shell calcification** of hilar lymph nodes is not its characteristic radiological feature. - Active TB often presents with **fever**, **night sweats**, and nodules that may progress to **cavitation**. *Sarcoidosis* - Sarcoidosis is a multi-system inflammatory disease that can lead to **pulmonary nodules** and **hilar lymphadenopathy**, but the characteristic calcification pattern is usually not "egg-shell". - It often presents with **erythema nodosum**, **uveitis**, or **non-caseating granulomas** on biopsy.
Question 8: A lady presents with complaints of hemoptysis, and her chest X-ray appears to be normal. What is the next best investigation?
- A. Bronchoscopy for airway evaluation
- B. High-resolution CT scan of the chest (Correct Answer)
- C. Sputum cytology for malignancy detection
- D. Pulmonary function tests for lung assessment
Explanation: ***High-resolution CT scan of the chest*** - A **normal chest X-ray** does not rule out significant pulmonary pathology as it can miss small lesions, especially in cases of hemoptysis [1]. - An **HRCT scan** is more sensitive for detecting subtle parenchymal, airway, or vascular abnormalities that could be causing bleeding [1][2]. *Bronchoscopy for airway evaluation* - While bronchoscopy is a critical tool for investigating hemoptysis, performing an **HRCT first** helps localize the bleeding source or narrow down potential etiologies, guiding the bronchoscopist [1]. - Starting directly with bronchoscopy without prior imaging might miss **parenchymal lesions** not visible in the airways and increases procedural risk if the source is unknown. *Sputum cytology for malignancy detection* - **Sputum cytology** has a low sensitivity for detecting malignancy, especially if the lesion is not centrally located or actively shedding cells. - It is often reserved for patients with clear suspicion of cancer and usually follows imaging studies that indicate a suspicious mass [1]. *Pulmonary function tests for lung assessment* - **Pulmonary function tests** assess lung volumes, airflow, and gas exchange but do not diagnose the cause of hemoptysis. - These tests are primarily used for evaluating **respiratory mechanics** and the presence of obstructive or restrictive lung diseases, not acute bleeding.
Question 9: A 40-year-old male presents with tachypnea. Examination reveals a respiratory rate of 32/min, pulmonary hypertension, blood pressure of 132/90 mmHg, and elevated JVP. What is the most likely cause of these findings?
- A. Tension pneumothorax
- B. Aortic dissection and rupture
- C. Right ventricular hypertrophy
- D. Cor pulmonale (Correct Answer)
Explanation: ***Cor pulmonale*** - **Cor pulmonale** is right heart failure secondary to pulmonary disease, which perfectly explains the constellation of **tachypnea**, **pulmonary hypertension**, and **elevated JVP**. - The pathophysiology involves underlying lung disease leading to **pulmonary hypertension**, causing **right heart strain** and eventual right heart failure. *Tension pneumothorax* - Characterized by **severe dyspnea**, **hypotension**, and **tracheal deviation**, none of which are explicitly mentioned here. - While it causes tachypnea, it would typically present with **unilateral absent breath sounds** and **hemodynamic instability**, not chronic pulmonary hypertension. *Aortic dissection and rupture* - Typically presents with **sudden onset severe chest pain**, **pulse deficits**, and often **blood pressure differences** between arms. - Does not primarily cause **pulmonary hypertension** or **elevated JVP** as its initial and predominant symptoms. *Right ventricular hypertrophy* - This represents a **structural adaptation** to chronic pressure overload rather than the primary cause of the clinical syndrome. - **RVH** is a consequence and manifestation of **cor pulmonale**, not the underlying diagnosis explaining the patient's presentation.
Question 10: All of the following are features of interstitial lung disease except which one?
- A. Digital clubbing
- B. Coarse crepitations heard on auscultation.
- C. Early productive cough (Correct Answer)
- D. Exertional dyspnea
Explanation: ***Early productive cough*** - Interstitial lung diseases (ILDs) typically cause a **dry, non-productive cough** [1] due to inflammation and fibrosis in the lung parenchyma, rather than significant mucus production. - A productive cough is more characteristic of **bronchial diseases** like bronchitis or bronchiectasis, where there is an increase in mucus secretion. *Exertional dyspnea* - **Exertional dyspnea** is a hallmark symptom of ILDs [1], as the stiffened, fibrotic lungs struggle to expand and efficiently transfer oxygen during physical activity [2]. - This symptom progressively worsens as the disease advances, limiting the patient's exercise capacity. *Digital clubbing* - **Digital clubbing** (thickening of the distal phalanges with increased convexity of the nail) is a common sign in many chronic lung diseases, including various forms of ILD [1]. - It reflects prolonged hypoxemia and is frequently seen in conditions like **idiopathic pulmonary fibrosis**. *Coarse crepitations heard on auscultation* - **Coarse crepitations** (also described as Velcro-like crackles) are a characteristic auscultatory finding in ILDs [1], particularly at the lung bases. - These sounds are thought to result from the sudden opening of collapsed airways and alveoli during inspiration in fibrotic lungs.
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