Respiratory Pathology — MCQs

A 56-year-old man undergoing chemotherapy for leukemia develops fever, nonproductive cough, dyspnea, pleuritic chest pain, and hemoptysis over one week. A chest CT scan shows multiple 1- to 4-cm nodular densities with surrounding ground-glass infiltrate (halo sign). Bronchoalveolar lavage fluid microscopy reveals narrow branching septate hyphae. His CBC shows Hgb, 13 g/dL; Hct, 38.7%; WBC count, 2000/mL; and platelet count, 200,100/mL. Which of the following organisms is the most likely cause of this infection?

Q228Easy

What does the cut surface of lungs show in Silicosis?

Q229Medium

A 37-year-old man is admitted to the hospital with shortness of breath, cyanosis, and fever. Chest X-ray films reveal consolidation of the right lower lobe with relative sparing of the remaining lobes. A clinical diagnosis of lobar pneumonia is made and supported by the results of sputum cultures. Which of the following is the genus of the bacterium most likely to be isolated from this patient's sputum?

Q230Medium

Bronchial adenoma commonly presents as:

Respiratory Pathology Indian Medical PG Practice Questions and MCQs

Question 221: Chronic passive congestion of the lungs is most often secondary to which of the following conditions?

A. Malnutrition
B. Massive hemorrhage
C. Corpulmonale (Correct Answer)
D. Atherosclerotic heart disease

Explanation: **Explanation:** **Chronic Passive Congestion (CPC) of the Lungs** occurs when there is a persistent backup of blood in the pulmonary vasculature due to an inability of the heart to pump blood effectively into the systemic circulation [1]. **Why Option C is Correct:** **Cor pulmonale** refers to right-sided heart failure resulting from primary pulmonary hypertension or chronic lung diseases (like COPD). In the context of "Chronic Passive Congestion of the Lungs," the term is traditionally associated with **Left-Sided Heart Failure** [1]. However, in many standardized examinations, if "Left Heart Failure" is not an option, **Cor pulmonale** (or chronic heart disease) is selected as it represents the hemodynamic failure of the cardiopulmonary circuit. *Note: In clinical practice, CPC of the lungs is caused by Left Heart Failure, while Cor pulmonale causes CPC of the Liver (Nutmeg liver).* **Why the other options are incorrect:** * **A & B (Malnutrition & Massive Hemorrhage):** These conditions lead to hypovolemia or decreased oncotic pressure, which results in reduced venous return rather than congestion. * **D (Atherosclerotic Heart Disease):** While this can lead to heart failure, it is a broad etiology. Cor pulmonale specifically describes the structural/functional failure directly linked to the pulmonary-cardiac interface. **High-Yield NEET-PG Pearls:** 1. **Gross Appearance:** The lungs become heavy, firm, and brown—a condition known as **Brown Induration**. 2. **Microscopic Hallmark:** The presence of **Heart Failure Cells** (hemosiderin-laden macrophages) in the alveolar spaces, resulting from the breakdown of extravasated red blood cells. 3. **Sequence:** Increased pulmonary venous pressure → Capillary congestion → Micro-hemorrhages → Phagocytosis by macrophages → Fibrosis and Brown Induration. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Heart, pp. 536-538.

Question 222: Which organ is primarily involved in Good-pasture syndrome?

A. Liver
B. Adrenals
C. Kidney (Correct Answer)
D. Brain

Explanation: **Explanation:** **Goodpasture Syndrome (GPS)** is an autoimmune disorder characterized by the presence of circulating autoantibodies against the **non-collagenous domain (NC1) of the alpha-3 chain of Type IV collagen** [3]. 1. **Why Kidney is Correct:** Type IV collagen is a critical structural component of basement membranes [3]. The alpha-3 chain is specifically expressed in the **Glomerular Basement Membrane (GBM)** of the kidneys and the **Alveolar Basement Membrane** of the lungs [1]. Consequently, the clinical hallmark of GPS is a "Pulmonary-Renal Syndrome," manifesting as **Rapidly Progressive Glomerulonephritis (RPGN)** and pulmonary hemorrhage [1]. On immunofluorescence, it shows a characteristic **linear IgG deposition** along the GBM [2]. 2. **Why Other Options are Incorrect:** * **Liver, Adrenals, and Brain:** These organs do not contain the specific alpha-3 chain of Type IV collagen targeted by the autoantibodies in Goodpasture Syndrome. While systemic vasculitides (like SLE or Polyarteritis Nodosa) can affect these organs, GPS is strictly localized to the basement membranes of the kidneys and lungs [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Hypersensitivity Type:** It is a classic example of **Type II Hypersensitivity**. * **HLA Association:** Strongly associated with **HLA-DRB1*1501** and **DR4** [1]. * **Morphology:** Light microscopy typically shows **Crescentic Glomerulonephritis**. * **Diagnosis:** Gold standard is the detection of anti-GBM antibodies in serum or linear deposits on renal biopsy [3]. * **Treatment:** Plasmapheresis (to remove antibodies), corticosteroids, and cyclophosphamide [1]. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Diseases Of The Urinary And Male Genital Tracts, pp. 537-538. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, p. 909. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Diseases Of The Urinary And Male Genital Tracts, pp. 526-527.

Question 223: Masson bodies are seen in which of the following conditions?

A. Usual interstitial pneumonia
B. Non-specific interstitial pneumonia
C. Cryptogenic Organizing Pneumonia (Correct Answer)
D. Hyaline membrane disease

Explanation: ### Explanation **Correct Answer: C. Cryptogenic Organizing Pneumonia (COP)** **Masson bodies** are the hallmark histopathological feature of Cryptogenic Organizing Pneumonia (formerly known as BOOP) [1]. They are defined as **polypoid plugs of loose, organizing connective tissue** (fibroblasts and collagen) found within the alveoli, alveolar ducts, and sometimes bronchioles [1]. The underlying mechanism involves an inflammatory response to alveolar injury where the exudate, instead of being resorbed, undergoes "organization" by fibroblasts [1]. Importantly, in COP, the lung architecture remains preserved, and there is no interstitial fibrosis, which distinguishes it from other restrictive lung diseases. [1] **Analysis of Incorrect Options:** * **A. Usual Interstitial Pneumonia (UIP):** Characterized by "fibroblastic foci" and a "honeycomb lung" appearance with significant architectural distortion and temporal heterogeneity. It does not typically feature intra-alveolar Masson bodies. * **B. Non-specific Interstitial Pneumonia (NSIP):** Features uniform (monomorphous) interstitial inflammation or fibrosis. It lacks the patchy, polypoid intra-alveolar plugs seen in COP. * **C. Hyaline Membrane Disease (RDS):** Characterized by thick, eosinophilic **hyaline membranes** lining the alveoli (composed of fibrin and necrotic type II pneumocytes), not organized fibroblast plugs. **High-Yield Clinical Pearls for NEET-PG:** * **Radiology:** COP typically presents with "patchy subpleural or peribronchial areas of consolidation." [1] * **Treatment:** COP shows a dramatic response to **corticosteroids**, unlike UIP. [1] * **Triad of COP:** Masson bodies + Preserved lung architecture + No interstitial fibrosis. * **Masson bodies vs. Fibroblastic foci:** Masson bodies are *intra-alveolar* (COP); Fibroblastic foci are *interstitial* (UIP). **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Respiratory Tract Disease, pp. 330-331.

Question 224: Which of the following inhaled occupational pollutants produces extensive nodular pulmonary fibrosis?

A. Silica (Correct Answer)
B. Asbestos
C. Wood dust
D. Carbon

Explanation: **Explanation:** **Silica (Option A)** is the correct answer because **Silicosis** is characterized by the formation of pathognomonic **silicotic nodules** [1]. When inhaled, crystalline silica particles are ingested by alveolar macrophages. Silica is cytotoxic; it disrupts phagolysosomes, leading to macrophage death and the release of fibrogenic cytokines (like IL-1 and TNF). This results in a localized, concentric whorled arrangement of hyalinized collagen fibers (nodules), which can coalesce into **Progressive Massive Fibrosis (PMF)** [2]. **Why other options are incorrect:** * **Asbestos (Option B):** Primarily causes **diffuse interstitial fibrosis** (Asbestosis) rather than discrete nodules [4]. It typically affects the lower lobes and is associated with pleural plaques and ferruginous bodies [4]. * **Wood dust (Option C):** This is generally associated with hypersensitivity pneumonitis or sinonasal carcinomas (adenocarcinoma), not extensive nodular pulmonary fibrosis [2]. * **Carbon (Option D):** Simple Coal Workers' Pneumoconiosis (CWP) is characterized by **coal macules and nodules**, but pure carbon is relatively inert [2]. Extensive fibrosis usually occurs only when carbon is mixed with silica (Anthracosilicosis). **High-Yield Clinical Pearls for NEET-PG:** * **Radiology:** Silicosis classically shows "eggshell calcification" of hilar lymph nodes. * **Microscopy:** Silicotic nodules show **birefringent** silica particles under polarized light. * **Complication:** Silicosis is strongly associated with an increased susceptibility to **Tuberculosis** (due to impaired macrophage function) [3]. * **Location:** Unlike asbestosis, silicosis primarily affects the **upper lobes** of the lungs [4]. **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. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, pp. 698-699.

Question 225: What is the commonest type of emphysema?

A. Centriacinar
B. Obstructed
C. Irregular (Correct Answer)
D. Panacinar

Explanation: **Explanation:** The correct answer is **Irregular Emphysema**. While many students mistakenly choose centriacinar emphysema due to its strong association with smoking, **irregular emphysema is statistically the most common type.** [1] **1. Why Irregular Emphysema is Correct:** Irregular emphysema is characterized by involvement of the acinus in a haphazard manner. It is almost always associated with **scarring** (paracicatricial). [1] Because most individuals have minor inflammatory lung injuries or healed granulomatous diseases (like healed primary TB) throughout their lives, these small areas of scarring lead to irregular enlargement of airspaces. It is usually asymptomatic and found incidentally during autopsy. [1] **2. Analysis of Incorrect Options:** * **Centriacinar (Centrilobular):** This is the most common **clinically significant** type. [1] It primarily affects the proximal parts of the acini (respiratory bronchioles) and is strongly associated with cigarette smoking and coal workers' pneumoconiosis. * **Panacinar (Panlobular):** This involves the entire acinus uniformly. It is characteristically seen in **Alpha-1 Antitrypsin Deficiency** and typically affects the lower lobes of the lungs. [1] * **Obstructed (Overinflation):** This is not a true primary emphysema but rather "obstructive overinflation," where a lung segment expands because air is trapped by a tumor or foreign body. **3. NEET-PG High-Yield Pearls:** * **Most common overall:** Irregular Emphysema. * **Most common in smokers:** Centriacinar (Upper lobes). * **Alpha-1 Antitrypsin Deficiency:** Panacinar (Lower lobes). * **Spontaneous Pneumothorax in young adults:** Paraseptal Emphysema (distal acinar). [1] * **Definition of Emphysema:** Permanent enlargement of airspaces distal to the terminal bronchioles with destruction of their walls **without** significant fibrosis. [1] **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, pp. 683-685.

Question 226: Which of the following statements is false?

A. Primary tuberculosis is more common in children
B. Miliary TB is a type of secondary TB
C. Simmond's focus is seen in the liver
D. Assman's focus is supraclavicular in location (Correct Answer)

Explanation: ### Explanation This question tests your knowledge of the morphological patterns and eponyms associated with **Tuberculosis (TB)**, a high-yield topic for NEET-PG. **Why Option D is the Correct Answer (The False Statement):** **Assman’s focus** is a radiological and pathological term used to describe an infraclavicular (below the clavicle) area of consolidation or early infiltration in **Secondary Tuberculosis**. The statement claims it is supraclavicular, making it factually incorrect. It typically represents the early site of reactivation in the apical or posterior segments of the upper lobes. **Analysis of Other Options:** * **A. Primary TB is more common in children:** This is true. In endemic areas, primary infection usually occurs in childhood. It is characterized by the **Ghon Complex** (subpleural focus + lymphangitis + hilar lymphadenopathy). * **B. Miliary TB is a type of secondary TB:** This is true. While miliary spread can occur in primary TB (especially in immunocompromised patients), it is classically a complication of **Secondary TB** due to the hematogenous spread of bacilli via the pulmonary arteries or systemic circulation, resulting in millet-sized lesions in various organs [1]. * **C. Simmond’s focus is seen in the liver:** This is true. Eponymous foci in TB are often tested. While the **Ghon focus** is in the lung, **Simmond’s focus** refers to a tuberculous nodule specifically located in the **liver**. **High-Yield Clinical Pearls for NEET-PG:** * **Ghon Focus:** Subpleural lesion, usually in the lower part of the upper lobe or upper part of the lower lobe. * **Ranke Complex:** A calcified Ghon complex (visible on X-ray). * **Puhl’s Focus:** A specific apical lesion seen in secondary TB. * **Rich Focus:** A subpial or subependymal tubercle in the brain that ruptures to cause TB meningitis. * **Weigert’s Law:** Refers to the hematogenous spread in miliary TB occurring via the invasion of a pulmonary vein [1]. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Respiratory Tract Disease, pp. 320-321.

Question 227: A 56-year-old man undergoing chemotherapy for leukemia develops fever, nonproductive cough, dyspnea, pleuritic chest pain, and hemoptysis over one week. A chest CT scan shows multiple 1- to 4-cm nodular densities with surrounding ground-glass infiltrate (halo sign). Bronchoalveolar lavage fluid microscopy reveals narrow branching septate hyphae. His CBC shows Hgb, 13 g/dL; Hct, 38.7%; WBC count, 2000/mL; and platelet count, 200,100/mL. Which of the following organisms is the most likely cause of this infection?

A. Aspergillus fumigatus (Correct Answer)
B. Candida albicans
C. Cryptococcus neoformans
D. Moraxella catarrhalis

Explanation: ### Explanation **Correct Answer: A. Aspergillus fumigatus** The clinical presentation and imaging are classic for **Invasive Aspergillosis**, a life-threatening fungal infection primarily seen in severely immunocompromised patients (e.g., leukemia patients with prolonged **neutropenia**, as seen in this patient with a WBC count of 2000/mL) [1], [2]. * **The "Halo Sign":** On CT, the nodular densities represent focal infarction/necrosis, while the surrounding ground-glass opacity (the "halo") represents **perinodular hemorrhage**. This is a hallmark of angioinvasive fungi. * **Microscopy:** *Aspergillus* is characterized by **narrow, septate hyphae** [1] that exhibit **dichotomous branching at acute angles (45°)**. * **Clinical Triad:** Fever, pleuritic chest pain, and hemoptysis in a neutropenic patient strongly suggest this diagnosis [2]. **Why Incorrect Options are Wrong:** * **B. Candida albicans:** While common in leukemia, it typically causes mucosal infections (thrush) or disseminated candidemia [3], [4]. Microscopically, it shows **pseudohyphae and budding yeasts**, not septate branching hyphae [3]. * **C. Cryptococcus neoformans:** Usually presents as meningitis or pneumonia in AIDS patients. It is characterized by **thick-walled yeast with a polysaccharide capsule** (visualized with India Ink or Mucicarmine), not hyphae. * **D. Moraxella catarrhalis:** A Gram-negative diplococcus that causes exacerbations of COPD or otitis media; it does not produce hyphae or the CT "halo sign." **High-Yield Clinical Pearls for NEET-PG:** 1. **Angioinvasion:** *Aspergillus* has a predilection for invading blood vessel walls, leading to thrombosis, infarction, and hematogenous spread [2]. 2. **Air-Crescent Sign:** A later CT finding in Invasive Aspergillosis (during recovery of neutropenia) representing necrotic tissue separating from the lung parenchyma. 3. **Galactomannan Assay:** A serum/BAL biomarker used for the diagnosis of invasive aspergillosis. 4. **Treatment:** Voriconazole is the drug of choice. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Respiratory Tract Disease, pp. 318-319. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Infectious Diseases, pp. 396-397. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, pp. 736-737. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Infectious Diseases, pp. 394-395.

Question 228: What does the cut surface of lungs show in Silicosis?

A. Pleural thickening
B. Hard collagenous scars
C. Nodules
D. All of the above (Correct Answer)

Explanation: **Explanation:** Silicosis is a chronic fibrosing pneumoconiosis caused by the inhalation of crystalline silicon dioxide (silica) [1]. The pathology of silicosis is characterized by a progressive, inflammatory, and fibrotic response [2]. **Why "All of the above" is correct:** The gross appearance of a silicotic lung reflects the chronic inflammatory process: 1. **Nodules:** The hallmark of silicosis is the **silicotic nodule**. On the cut surface, these appear as small, discrete, firm, blackened (due to concomitant anthracosis) nodules, primarily in the upper lobes [1]. 2. **Hard collagenous scars:** As the disease progresses, these nodules coalesce to form large, dense, "hard" collagenous scars [1]. This stage is known as **Progressive Massive Fibrosis (PMF)**. 3. **Pleural thickening:** The fibrotic process often extends to the visceral pleura, leading to dense pleural thickening and adhesions, which can obliterate the pleural space. **Analysis of Options:** * **A, B, and C** are all characteristic gross findings. While the "nodule" is the microscopic hallmark, the cut surface of an advanced silicotic lung will invariably show a combination of nodules, massive scarring (PMF), and associated pleural changes. Therefore, "All of the above" is the most comprehensive answer. **High-Yield NEET-PG Pearls:** * **Microscopy:** Shows a central area of whorled collagen fibers with a peripheral zone of macrophages and plasma cells. * **Birefringence:** Under polarized light, silica particles appear as **weakly birefringent** needles. * **Radiology:** Characterized by "Eggshell calcification" of the hilar lymph nodes (calcium salts depositing in the periphery of the nodes). * **Complication:** Silicosis significantly increases the risk of **Tuberculosis (Silicotuberculosis)** because silica impairs macrophage function (phagolysosome formation) [1]. * **Occupational History:** Look for keywords like sandblasting, stone cutting, mining, or ceramics [2]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, pp. 697-698. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, p. 697.

Question 229: A 37-year-old man is admitted to the hospital with shortness of breath, cyanosis, and fever. Chest X-ray films reveal consolidation of the right lower lobe with relative sparing of the remaining lobes. A clinical diagnosis of lobar pneumonia is made and supported by the results of sputum cultures. Which of the following is the genus of the bacterium most likely to be isolated from this patient's sputum?

A. Haemophilus
B. Klebsiella
C. Streptococcus, alpha-hemolytic (Correct Answer)
D. Streptococcus, beta-hemolytic

Explanation: The clinical presentation of acute onset fever, cyanosis, and shortness of breath, combined with a chest X-ray showing **lobar consolidation**, is classic for **Lobar Pneumonia** [1]. 1. **Why the correct answer is right:** The most common cause of community-acquired lobar pneumonia (responsible for approximately 90-95% of cases) is ***Streptococcus pneumoniae*** (Pneumococcus) [1], [4]. On blood agar, *S. pneumoniae* exhibits **alpha-hemolysis** (partial green hemolysis). It is a Gram-positive, lancet-shaped diplococcus [1]. The pathology typically progresses through four stages: Congestion, Red Hepatization, Gray Hepatization, and Resolution [1], [3]. 2. **Why the incorrect options are wrong:** * **Haemophilus (A):** *H. influenzae* is a common cause of bronchopneumonia, particularly in patients with underlying COPD, but it is not the primary cause of classic lobar consolidation [1], [2]. * **Klebsiella (B):** While *Klebsiella pneumoniae* can cause lobar pneumonia, it typically affects malnourished individuals or chronic alcoholics and is characterized by "currant jelly sputum" and bulging fissures on X-ray [2]. It is less common than *S. pneumoniae*. * **Streptococcus, beta-hemolytic (D):** Group A Streptococci (*S. pyogenes*) are more commonly associated with skin infections or pharyngitis and are a rare cause of primary lobar pneumonia. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of CAP:** *Streptococcus pneumoniae* [4]. * **Rust-colored sputum:** Highly suggestive of *S. pneumoniae*. * **Quellung Reaction:** Used for serotyping *S. pneumoniae* based on its polysaccharide capsule. * **Bile Solubility/Optochin Sensitivity:** Key laboratory tests to differentiate *S. pneumoniae* (sensitive/soluble) from other alpha-hemolytic streptococci like *S. viridans* (resistant/insoluble). **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, pp. 709-711. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, p. 715. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Respiratory Tract Disease, pp. 317-318. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, pp. 714-715.

Question 230: Bronchial adenoma commonly presents as:

A. Recurrent hemoptysis (Correct Answer)
B. Cough
C. Dyspnea
D. Chest pain

Explanation: **Explanation:** **Bronchial adenoma** is an older, clinical term primarily used to describe **Bronchial Carcinoids** (accounting for 80-90% of cases), as well as adenoid cystic carcinomas and mucoepidermoid carcinomas. **Why Recurrent Hemoptysis is the correct answer:** Bronchial carcinoids are typically **centrally located** (endobronchial) and are characterized by extreme **vascularity**. Because these tumors grow within the lumen of large bronchi and are covered by a highly vascularized intact mucosa [1], they are prone to surface erosion. This leads to **recurrent, painless episodes of hemoptysis**, which is the most classic and common presenting symptom. **Analysis of Incorrect Options:** * **B. Cough:** While cough can occur due to endobronchial irritation, it is non-specific and often secondary to the obstructive effects or associated infection. * **C. Dyspnea:** This occurs only if the tumor is large enough to cause significant airway obstruction or collapse of a lung lobe (atelectasis). * **D. Chest pain:** This is rare and usually indicates pleural involvement or secondary pneumonia, which is less common in the early stages of bronchial adenoma compared to hemoptysis. **High-Yield Pearls for NEET-PG:** * **Histology:** Carcinoid tumors show a characteristic **"Organoid pattern"** with uniform polygonal cells, salt-and-pepper chromatin [1], and are positive for neuroendocrine markers like **Chromogranin A, Synaptophysin, and CD56.** * **Location:** Most are central (perihilar). * **Carcinoid Syndrome:** Rare in bronchial carcinoids (only 1-2%) unless liver metastases are present. * **Radiology:** May present as a "check-valve" obstruction leading to obstructive emphysema or a "Golden S sign" if causing lobar collapse. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, p. 727.

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