Respiratory Pathology Practice Questions

Q: Beryllium exposure is associated with which of the following conditions?

Granulomatous lung disease. **Explanation:** **Berylliosis (Chronic Beryllium Disease)** is a systemic disease primarily affecting the lungs, caused by the inhalation of beryllium dust or fumes. It is most commonly seen in workers in the aerospace, electronics, and nuclear industries. **Why Option B is Correct:** The hallmark of Beryllium exposure is the formation of **non-caseating granulomas** in the lungs and hilar lymph nodes. Pathologically and radiologically, it closely mimics **Sarcoidosis**. It is a Type IV (delayed-type) hypersensitivity reaction where beryllium acts as a hapten, triggering a T-cell mediated immune response that leads to granuloma formation. **Analysis of Incorrect Options:** * **A. Pulmonary fibrosis:** While chronic berylliosis can eventually lead to interstitial fibrosis as a late-stage complication, the primary and defining pathological feature is granulomatous inflammation. * **C. Lung cancer:** Although IARC classifies beryllium as a Group 1 carcinogen, it is not the classic clinical presentation associated with the term "Beryllium exposure" in the context of occupational lung disease questions. * **D. Chronic bronchitis:** This is typically associated with smoking or general industrial irritants (like coal dust), rather than the specific hypersensitivity reaction seen in berylliosis. **High-Yield Clinical Pearls for NEET-PG:** * **Diagnostic Test:** The **Beryllium Lymphocyte Proliferation Test (BeLPT)** is the gold standard for screening and diagnosis (measures T-cell proliferation in response to beryllium). * **Differential Diagnosis:** Always differentiate from Sarcoidosis. A key clue is the **occupational history** (aerospace/high-tech industries). * **Radiology:** Shows bilateral hilar adenopathy and reticulonodular opacities, predominantly in the **upper lobes**. * **Treatment:** Corticosteroids are the mainstay of treatment to suppress the immune response.

Q: Which of the following compounds is elevated in bronchial asthma?

Leukotrienes. **Explanation:** **Bronchial Asthma** is a chronic inflammatory airway disease characterized by reversible airway obstruction, mucus hypersecretion, and bronchial hyperresponsiveness. The underlying pathophysiology involves a Type I Hypersensitivity reaction. **Why Leukotrienes are correct:** In asthma, the activation of mast cells and eosinophils leads to the metabolism of arachidonic acid via the **5-Lipoxygenase (5-LOX) pathway**. This results in the production of **Cysteinyl Leukotrienes (LTC4, LTD4, and LTE4)**, formerly known as the *Slow-Reacting Substance of Anaphylaxis (SRS-A)*. These compounds are potent bronchoconstrictors (1000x more potent than histamine), increase vascular permeability, and stimulate mucus secretion, making them central to asthma pathogenesis. **Why the other options are incorrect:** * **PGI2 (Prostacyclin):** Produced via the Cyclooxygenase (COX) pathway, it is a potent vasodilator and inhibitor of platelet aggregation. It does not play a primary role in the bronchoconstriction seen in asthma. * **PGH2:** This is an unstable intermediate in the COX pathway that is rapidly converted into various prostaglandins or thromboxanes; it is not a specific marker for asthma. * **Thromboxane (TXA2):** Primarily involved in platelet aggregation and vasoconstriction. While it has minor bronchoconstrictor effects, it is not the hallmark mediator elevated in asthma compared to leukotrienes. **High-Yield Clinical Pearls for NEET-PG:** * **Zileuton:** A drug that inhibits the 5-Lipoxygenase enzyme. * **Montelukast/Zafirlukast:** Selective antagonists of the **CysLT1 receptor**, used as maintenance therapy in asthma. * **Aspirin-Exacerbated Respiratory Disease (AERD):** Occurs because Aspirin blocks the COX pathway, shunting arachidonic acid toward the LOX pathway, leading to an overproduction of leukotrienes. * **Charcot-Leyden Crystals:** Found in the sputum of asthmatics, derived from eosinophil lysophospholipase.

Question 1

Pleural calcification is found in all of the following conditions except?

Accepted Answer

Hemothorax

Answer

Asbestosis

Answer

Tuberculous pleural effusion

Answer

Coal workers' pneumoconiosis

Question 2

The immune system in asthmatics is typically skewed towards which of the following phenotypes?

Accepted Answer

Th2 phenotype

Answer

Th1 phenotype

Answer

Th3 phenotype

Answer

Th0 phenotype

Question 3

Beryllium exposure is associated with which of the following conditions?

Accepted Answer

Granulomatous lung disease

Answer

Pulmonary fibrosis

Answer

Lung cancer

Answer

Chronic bronchitis

Question 4

A 46-year-old man presents with a year of increasing dyspnea and nonproductive cough. Physical examination reveals clubbing of digits and no fever. Pulmonary function tests show a mild restrictive abnormality and reduced DLCO. A transbronchial biopsy reveals numerous alveolar macrophages containing lamellar bodies and iron pigment, along with plump epithelial cells, mild interstitial fibrosis, and loss of respiratory bronchioles. What is the most likely etiology for his pulmonary disease?

Accepted Answer

Cigarette smoking

Answer

Type I hypersensitivity

Answer

Ciliary dyskinesia

Answer

Inhalation of mold spores

Question 5

Which of the following histopathological findings is most commonly associated with COVID-19?

Accepted Answer

Diffuse alveolar damage

Answer

Pulmonary fibrosis

Answer

Massive pulmonary hemorrhage

Answer

Changes of pulmonary arterial hypertension

Question 6

Which of the following morphological changes in the lungs would be found in a patient of asthma?

Accepted Answer

Viscid mucus plugs in the small airways

Answer

Destruction and dilation of the bronchi and bronchioles

Answer

Free air in the interstitium

Answer

Peribronchiolar fibrosis

Question 7

A 28-year-old woman with cystic fibrosis presents with increasing shortness of breath and production of abundant foul-smelling sputum. The sputum in this patient is most likely associated with which of the following pulmonary conditions?

Accepted Answer

Bronchiectasis

Answer

Atelectasis

Answer

Empyema

Answer

Pneumothorax

Question 8

Regarding Asbestosis, all are true except?

Accepted Answer

Pan-acinar emphysema

Answer

Diffuse interstitial fibrosing lung disease

Answer

High risk of adenocarcinoma of the lung

Answer

Pleural mesothelioma

Question 9

Which is the most common type of lung cancer associated with tobacco smoking?

Accepted Answer

Squamous cell carcinoma

Answer

Adenocarcinoma

Answer

Large cell carcinoma

Answer

Metaplastic carcinoma

Question 10

Which of the following compounds is elevated in bronchial asthma?

Accepted Answer

Leukotrienes

Answer

PGI2

Answer

PGH2

Answer

Thromboxane

Respiratory Pathology — MCQs

Respiratory Pathology — MCQs

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