Respiratory Pathology — MCQs

A 68-year-old woman with a history of heavy smoking and repeated bouts of pneumonia presents with a 2-week history of fever and productive cough. A chest X-ray reveals a right lower lobe infiltrate, and a trans-bronchial biopsy confirms pneumonia and shows preneoplastic changes within the bronchial mucosa. Which of the following best characterizes the morphology of this bronchial mucosal lesion?

Q107Easy

Which is the most commonly mutated gene in surfactant dysfunction disorders?

Q108Medium

A 60-year-old male with a chronic history of asbestos exposure presents with a mass in the apex of the right lung. Which of the following would be seen on electron microscopy of a biopsy from the lesion?

Q109Easy

What is the most common benign tumor of the lung?

Q110Medium

Scar carcinoma of the lung is most commonly seen following which conditions?

Respiratory Pathology Indian Medical PG Practice Questions and MCQs

Question 101: Which of the following is true about Sarcoidosis?

A. Skin is the most common organ involved
B. It is a premalignant condition
C. Characterized by non-caseating granuloma (Correct Answer)
D. May be associated with hypocalcemia

Explanation: **Explanation:** **Correct Answer: C. Characterized by non-caseating granuloma** Sarcoidosis is a multisystemic, idiopathic disorder characterized by the formation of **non-caseating (non-necrotizing) granulomas** in various tissues [1]. These granulomas consist of tightly packed epithelioid histiocytes, multinucleated giant cells (Langhans or foreign-body type), and a rim of CD4+ T-lymphocytes [2], [3]. Unlike tuberculosis, there is no central cheesy (caseous) necrosis. **Analysis of Incorrect Options:** * **Option A:** While skin involvement (e.g., erythema nodosum, lupus pernio) is common (approx. 25%), the **Lungs and intrathoracic lymph nodes** are the most common organs involved, affected in >90% of cases [1]. * **Option B:** Sarcoidosis is a chronic inflammatory/granulomatous disease; it is **not** considered a premalignant condition. * **Option C:** Sarcoidosis is typically associated with **Hypercalcemia** and hypercalciuria. This occurs because activated macrophages within the granulomas express 1-alpha-hydroxylase, which converts Vitamin D into its active form (1,25-dihydroxyvitamin D), leading to increased intestinal calcium absorption. **High-Yield Clinical Pearls for NEET-PG:** * **Microscopic Findings:** Look for **Schaumann bodies** (laminated calcium-protein concretions) and **Asteroid bodies** (stellate inclusions within giant cells). * **Radiology:** Characterized by **bilateral hilar lymphadenopathy** (Stage I) [1]. * **Biomarkers:** Elevated **Serum ACE** (Angiotensin-Converting Enzyme) levels and a positive **Kveim Siltzbach test** (though rarely used now). * **Immune Profile:** Characterized by a **CD4:CD8 ratio >3.5:1** in Bronchoalveolar Lavage (BAL) fluid. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, pp. 700-701. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, p. 109. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 198-200.

Question 102: What is the most common cause of primary lung abscess?

A. Aerobic bacteria
B. Anaerobic bacteria (Correct Answer)
C. Acid-fast bacteria
D. Dimorphic fungal infection

Explanation: **Explanation:** A lung abscess is a localized area of suppurative necrosis within the pulmonary parenchyma. The classification into primary and secondary depends on the underlying mechanism [1]. **Why Anaerobic Bacteria is Correct:** Primary lung abscesses most commonly occur in patients predisposed to **aspiration**, such as those with altered consciousness (alcoholism, epilepsy, general anesthesia) or severe periodontal disease. The aspirated material typically contains a high burden of **commensal anaerobic bacteria** from the oropharynx. The most frequently isolated organisms include *Peptostreptococcus*, *Fusobacterium*, and *Bacteroides* species. These organisms thrive in the necrotic, poorly oxygenated environment of the abscess. **Why Other Options are Incorrect:** * **Aerobic Bacteria:** While *Staphylococcus aureus*, *Klebsiella pneumoniae*, and *Streptococcus pyogenes* can cause lung abscesses, they are more commonly associated with **secondary abscesses** (complicating a pre-existing pneumonia or hematogenous spread). * **Acid-fast Bacteria:** *Mycobacterium tuberculosis* causes "cold" cavitation rather than a typical acute pyogenic abscess. While it destroys lung tissue, it is not the "most common" cause of primary lung abscesses. * **Dimorphic Fungi:** Fungi like *Histoplasma* or *Coccidioides* can cause cavitary lesions, but these are rare compared to bacterial etiologies and usually occur in specific endemic regions or immunocompromised states. **High-Yield Clinical Pearls for NEET-PG:** * **Location:** Aspiration-induced (primary) abscesses are most common in the **posterior segment of the right upper lobe** and the **superior segment of the lower lobes** (due to gravity and the vertical nature of the right main bronchus) [1]. * **Clinical Sign:** Patients often present with **foul-smelling (putrid) sputum**, which is pathognomonic for anaerobic infection. * **Radiology:** Characterized by a cavity with an **air-fluid level** on a chest X-ray. * **Complication:** Rupture into the pleural space can lead to a **bronchopleural fistula** or **empyema**. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, pp. 715-716.

Question 103: Bilateral pleural plaques and pulmonary fibrosis involving the lung bases are hallmarks of which condition?

A. Asbestosis (Correct Answer)
B. Silicosis
C. Scleroderma
D. Byssinosis

Explanation: ### Explanation **Correct Answer: A. Asbestosis** Asbestosis is a form of pneumoconiosis caused by the inhalation of asbestos fibers. The hallmark pathological features include **bilateral pleural plaques** [1] (the most common manifestation) and **interstitial fibrosis**. Unlike most other occupational lung diseases (like silicosis or coal worker's pneumoconiosis), asbestosis characteristically involves the **lower lobes (lung bases)** and the subpleural regions [1]. The fibrosis is driven by alveolar macrophages attempting to ingest the fibers, leading to the release of fibrogenic cytokines. **Why other options are incorrect:** * **B. Silicosis:** Characterized by "silicotic nodules" primarily in the **upper lobes**. It is associated with "eggshell calcification" of hilar lymph nodes, not pleural plaques. * **C. Scleroderma:** While it causes lower lobe interstitial fibrosis (NSIP pattern), it does not typically present with pleural plaques, which are specific markers of asbestos exposure. * **D. Byssinosis:** Caused by cotton dust exposure [2]. It presents as occupational asthma ("Monday morning chest tightness") rather than permanent interstitial fibrosis or pleural plaques. **High-Yield Clinical Pearls for NEET-PG:** * **Asbestos Bodies (Ferruginous bodies):** Golden-brown, fusiform/beaded rods with translucent centers (coated with iron-containing protein) [1]. * **Pleural Plaques:** Most common finding; usually involve the parietal pleura and the domes of the diaphragm [1]. They are **not** precursors to malignancy. * **Malignancy:** Asbestos exposure increases the risk of both Lung Carcinoma and Mesothelioma [1]. **Lung Carcinoma** is the most common cancer in asbestos workers (especially smokers), but **Mesothelioma** is the most specific. * **Caplan Syndrome:** Combination of pneumoconiosis (usually coal or silica) and Rheumatoid Arthritis. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, pp. 698-699. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Respiratory Tract Disease, pp. 332-333.

Question 104: Histopathology of a lung cancer shows 'Clara cells'. What is the probable diagnosis?

A. Squamous cell carcinoma
B. Bronchioloalveolar carcinoma (Correct Answer)
C. Large cell carcinoma
D. Papillary carcinoma

Explanation: **Explanation:** **1. Why Bronchioloalveolar Carcinoma (BAC) is correct:** Bronchioloalveolar carcinoma (now classified under the spectrum of **Adenocarcinoma in situ**) is a subtype of adenocarcinoma that arises from the terminal bronchioloalveolar regions [1]. The characteristic feature of this tumor is that it grows along the pre-existing alveolar walls without invading the stroma, a pattern known as **lepidic growth** [1]. The cells of origin for BAC are typically **Type II pneumocytes** or **Clara cells** (now called Club cells). Clara cells are non-ciliated, secretory cells found in the terminal bronchioles, and their presence on histopathology is a classic diagnostic marker for this condition. **2. Why the other options are incorrect:** * **Squamous cell carcinoma:** Arises from the central airways (bronchi) due to squamous metaplasia caused by smoking [1]. It is characterized by keratin pearls and intercellular bridges, not Clara cells [1]. * **Large cell carcinoma:** An undifferentiated epithelial malignancy that lacks the cytological features of glandular or squamous differentiation. It consists of large, atypical cells with prominent nucleoli. * **Papillary carcinoma:** While some adenocarcinomas show papillary architecture, the specific association with Clara cells and the "lepidic" growth pattern is the hallmark of BAC/Adenocarcinoma in situ. **3. NEET-PG High-Yield Pearls:** * **Lepidic Growth:** Described as "butterflies sitting on a fence." * **Radiology:** Often presents as a peripheral solitary nodule or can mimic pneumonia (pneumonic form) with "bronchorrhea" (excessive watery sputum). * **Smoking Status:** BAC is the most common lung cancer subtype found in **non-smokers** and females. * **Clara Cell Marker:** CC10 protein is a specific marker for these cells. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Respiratory Tract Disease, pp. 335-337.

Question 105: All of the following statements about small cell carcinomas are true, except?

A. Commonest malignancy of the lung (Correct Answer)
B. Associated with paraneoplastic syndromes
C. Causes superior vena cava obstruction
D. Is chemosensitive

Explanation: **Explanation:** Small cell carcinoma (SCLC) is a highly aggressive neuroendocrine tumor [2], but it is **not** the most common lung malignancy. That title belongs to **Adenocarcinoma**, which is the most frequent subtype in both smokers and non-smokers. **Why Option A is the correct answer (The False Statement):** While SCLC is strongly associated with smoking, it accounts for only about 15% of lung cancers. Adenocarcinoma is the most common primary lung malignancy (~40%). **Analysis of other options:** * **Option B (Paraneoplastic Syndromes):** SCLC is the lung cancer most frequently associated with paraneoplastic syndromes due to its neuroendocrine origin [1]. Common examples include **SIADH** (ectopic ADH) and **Cushing syndrome** (ectopic ACTH). It is also linked to Lambert-Eaton Myasthenic Syndrome. * **Option C (Superior Vena Cava Obstruction):** SCLC typically presents as a **central/hilar mass** with early involvement of mediastinal lymph nodes [2]. This central location and rapid growth often lead to compression of the SVC, causing SVC syndrome. * **Option D (Chemosensitive):** Unlike Non-Small Cell Lung Carcinoma (NSCLC), SCLC is highly sensitive to chemotherapy and radiotherapy [1]. However, despite a high initial response rate, the prognosis remains poor due to frequent recurrence and early metastasis. **High-Yield Clinical Pearls for NEET-PG:** * **Origin:** Derived from **Kulchitsky cells** (neuroendocrine cells). * **Microscopy:** Shows "Oat cells" with scant cytoplasm, ill-defined borders, and **Azzopardi effect** (DNA staining of vessel walls) [2]. * **Genetics:** Almost 100% show **TP53** and **RB1** mutations. * **Markers:** Positive for Chromogranin A, Synaptophysin, and CD56 [2]. * **Key Rule:** SCLC is generally **not** treated surgically because it is usually metastatic at the time of diagnosis [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, pp. 725-727. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Respiratory Tract Disease, pp. 337-338.

Question 106: A 68-year-old woman with a history of heavy smoking and repeated bouts of pneumonia presents with a 2-week history of fever and productive cough. A chest X-ray reveals a right lower lobe infiltrate, and a trans-bronchial biopsy confirms pneumonia and shows preneoplastic changes within the bronchial mucosa. Which of the following best characterizes the morphology of this bronchial mucosal lesion?

A. Cellular maturation shows an abnormal pattern (Correct Answer)
B. Increased numbers of otherwise normal cells
C. Invasiveness
D. Presence of poorly differentiated keratin-producing cells

Explanation: The clinical scenario describes a chronic smoker with repeated infections and a biopsy showing "preneoplastic changes." In the context of the bronchial mucosa, this refers to **Dysplasia**, which often arises in a background of squamous metaplasia [1]. **1. Why Option A is Correct:** Dysplasia is characterized by **disordered growth and maturation** [3]. Morphologically, this involves a loss of cellular uniformity and architectural orientation [1]. Key features include pleomorphism (variation in size/shape), hyperchromatic nuclei, an increased nuclear-to-cytoplasmic (N:C) ratio, and increased mitotic figures [3]. Crucially, the **normal pattern of cellular maturation is disrupted**; for example, immature basal-like cells may be seen in the upper layers of the epithelium where they do not belong [1]. **2. Why the Other Options are Incorrect:** * **Option B (Hyperplasia):** This refers to an increase in the number of cells that maintain a normal morphology and organized arrangement. It is a controlled response to a stimulus, not a preneoplastic change [1]. * **Option C (Invasiveness):** This is the hallmark of **Malignancy (Carcinoma)**. Dysplasia is a "pre-invasive" lesion; by definition, the basement membrane remains intact [2]. Once cells breach the basement membrane, it is no longer dysplasia but invasive cancer [1]. * **Option D (Poorly differentiated cells):** This describes **Anaplasia**, a feature of high-grade malignancy. While dysplasia shows cellular atypia, the term "poorly differentiated" implies a lack of structural resemblance to the tissue of origin, typically seen in advanced cancers [3]. **Clinical Pearls for NEET-PG:** * **Sequence of Change:** Chronic Irritation (Smoking) → Squamous Metaplasia → Dysplasia → Carcinoma in situ → Invasive Squamous Cell Carcinoma [3]. * **Reversibility:** Metaplasia and mild-to-moderate dysplasia are generally **reversible** if the inciting stimulus (smoking) is removed [2]. Severe dysplasia/Carcinoma in situ is often irreversible. * **Key Histologic Marker:** The preservation of the **basement membrane** is the critical boundary distinguishing preneoplastic dysplasia from invasive neoplasia [2]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, p. 723. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 209-210. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 278-280.

Question 107: Which is the most commonly mutated gene in surfactant dysfunction disorders?

A. Surfactant protein B
B. Surfactant protein C
C. GM-CSF
D. ATP-binding cassette protein member 3 (ABCA3) (Correct Answer)

Explanation: **Explanation:** Surfactant dysfunction disorders are a group of genetic conditions that cause respiratory distress in neonates or interstitial lung disease in children and adults. **Why ABCA3 is the correct answer:** The **ABCA3 (ATP-binding cassette protein member 3)** gene is the **most common** site of mutation in surfactant dysfunction disorders. The ABCA3 protein is localized to the membrane of **lamellar bodies** in Type II pneumocytes. It functions as a transporter that pumps phospholipids (like dipalmitoylphosphatidylcholine) into these lamellar bodies to form surfactant. Mutations lead to defective lamellar body formation, resulting in surfactant deficiency and fatal respiratory distress in newborns. It follows an **autosomal recessive** inheritance pattern. **Analysis of Incorrect Options:** * **Surfactant protein B (SP-B):** Mutations in the *SFTPB* gene are the second most common cause [2]. It is inherited in an autosomal recessive manner and typically presents as lethal neonatal respiratory failure [2]. * **Surfactant protein C (SP-C):** Mutations in the *SFTPC* gene are less common and typically follow an **autosomal dominant** pattern [2]. It often presents later in life as chronic interstitial lung disease. * **GM-CSF:** Mutations in the GM-CSF receptor (CSF2RA/CSF2RB) lead to **Pulmonary Alveolar Proteinosis (PAP)** by impairing alveolar macrophage function [1], but they are not the primary cause of genetic surfactant synthesis disorders. **High-Yield Clinical Pearls for NEET-PG:** * **Most common mutation:** ABCA3 (Autosomal Recessive). * **Histology:** Often presents as **Desquamative Interstitial Pneumonia (DIP)** or **Nonspecific Interstitial Pneumonia (NSIP)** patterns on biopsy. * **Lamellar Bodies:** Small or absent lamellar bodies on electron microscopy are characteristic of ABCA3 deficiency. * **Treatment:** Definitive treatment for severe neonatal cases is often a lung transplant. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, pp. 703-705. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, p. 466.

Question 108: A 60-year-old male with a chronic history of asbestos exposure presents with a mass in the apex of the right lung. Which of the following would be seen on electron microscopy of a biopsy from the lesion?

A. Melanosomes
B. Neurosecretory granules
C. Numerous long slender microvilli (Correct Answer)
D. Desmosomes with secretory endoplasmic reticulum

Explanation: **Explanation:** The clinical presentation of a patient with chronic **asbestos exposure** and a lung mass strongly suggests **Malignant Mesothelioma**. While asbestos is also a risk factor for bronchogenic carcinoma (the most common cancer in asbestos workers), the specific ultrastructural findings mentioned in the options are classic for differentiating mesothelioma from adenocarcinoma [1]. **Why Option C is Correct:** On **Electron Microscopy (EM)**, Malignant Mesothelioma is characterized by **numerous, long, slender, and bushy microvilli** on the cell surface. These microvilli typically have a high length-to-diameter ratio (often >10:1). In contrast, adenocarcinoma cells exhibit short, blunt, and sparse microvilli. This is a high-yield diagnostic differentiator in pathology. **Analysis of Incorrect Options:** * **A. Melanosomes:** These are characteristic of **Melanoma**. While melanoma can metastasize to the lung, it is unrelated to asbestos exposure. * **B. Neurosecretory granules:** These "dense-core" granules are the hallmark of **Neuroendocrine tumors**, such as Small Cell Carcinoma or Carcinoid tumors. * **D. Desmosomes with secretory ER:** While both mesothelioma and adenocarcinoma can have desmosomes, the presence of prominent secretory endoplasmic reticulum and mucin vacuoles points toward **Adenocarcinoma** [3]. **NEET-PG High-Yield Pearls:** * **Most common cancer** in asbestos workers: **Bronchogenic Carcinoma**. * **Most specific cancer** associated with asbestos: **Malignant Mesothelioma** [2]. * **IHC Markers for Mesothelioma:** Calretinin (+), WT-1 (+), Cytokeratin 5/6 (+), and Podoplanin (+). It is typically **CEA negative** (unlike adenocarcinoma) [1]. * **Histology:** Look for **Psammoma bodies** in the epithelial variant of mesothelioma. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, p. 731. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Respiratory Tract Disease, pp. 339-340. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Respiratory Tract Disease, pp. 336-337.

Question 109: What is the most common benign tumor of the lung?

A. Hamartoma (Correct Answer)
B. Alveolar adenoma
C. Teratoma
D. Fibroma

Explanation: **Explanation:** **1. Why Hamartoma is the Correct Answer:** A pulmonary hamartoma is the **most common benign tumor of the lung**. Pathologically, it is not a true neoplasm but a malformation composed of tissues normally present in the lung but arranged in a disorganized mass [1]. The most characteristic feature is the presence of **islands of hyaline cartilage**, often mixed with fat, fibrous tissue, and smooth muscle, lined by respiratory epithelium [1]. **2. Analysis of Incorrect Options:** * **B. Alveolar adenoma:** A very rare benign peripheral lung tumor. While it presents as a solitary nodule, its incidence is significantly lower than that of hamartomas. * **C. Teratoma:** These are germ cell tumors. While they can occur in the mediastinum (most common extragonadal site), primary intrapulmonary teratomas are extremely rare. * **D. Fibroma:** A benign mesenchymal tumor arising from connective tissue. It is an infrequent finding in the lung parenchyma compared to hamartomas. **3. High-Yield Clinical Pearls for NEET-PG:** * **Radiology:** Typically presents as a "coin lesion" (solitary pulmonary nodule). The classic radiological sign is **"Popcorn Calcification"** on a CT scan. * **Growth:** Most are asymptomatic, slow-growing, and discovered incidentally in patients aged 40–60. * **Genetics:** Often associated with chromosomal aberrations involving **6p21 or 12q14-15** [1]. * **Differential Diagnosis:** In the context of a solitary pulmonary nodule, the primary goal is to rule out bronchogenic carcinoma, which is the most common *malignant* tumor. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, pp. 727-728.

Question 110: Scar carcinoma of the lung is most commonly seen following which conditions?

A. Tuberculosis (Correct Answer)
B. Irradiation
C. Infarct
D. Lung abscess

Explanation: **Explanation:** **Scar Carcinoma** refers to a peripheral lung adenocarcinoma that arises in the vicinity of localized pulmonary fibrosis or pre-existing scars. [1] **Why Tuberculosis is the correct answer:** In the Indian context and globally, **Tuberculosis (TB)** is the most common cause of pulmonary scarring. [2] Chronic inflammation and the subsequent healing process in TB lead to architectural distortion and localized fibrosis (usually in the upper lobes). These scars act as a nidus for atypical epithelial proliferation and genetic mutations, eventually progressing to malignancy. While the "scar-causes-cancer" theory is debated (some argue the tumor causes the scar), the clinical association remains strongest with TB. [1] **Analysis of Incorrect Options:** * **B. Irradiation:** While radiation can cause diffuse pulmonary fibrosis (Radiation Pneumonitis), it is a less frequent precursor to localized "scar carcinoma" compared to the high prevalence of TB-related scars. * **C. Infarct:** Healed pulmonary infarcts result in small peripheral scars. While they can theoretically undergo malignant transformation, they are statistically much less common than TB scars. * **D. Lung Abscess:** Healing of an abscess leads to significant fibrosis; however, the acute and destructive nature of an abscess is a less common clinical antecedent for scar carcinoma than chronic granulomatous diseases. **High-Yield Pearls for NEET-PG:** * **Most common histological type:** Adenocarcinoma (specifically the peripheral type). [1] * **Location:** Usually peripheral, near the pleura. * **Other associations:** Old surgical scars, metallic foreign bodies, and chronic interstitial fibrosis. * **Recent Concept:** Many pathologists now believe the "scar" is often a desmoplastic reaction *to* the tumor rather than the cause, but for exam purposes, TB remains the classic association. [1] **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Respiratory Tract Disease, pp. 335-336. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Respiratory Tract Disease, pp. 320-321.

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Lung Tumors

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Interstitial Lung Diseases

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Occupational Lung Diseases

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