Respiratory Pathology Practice Questions

Q: An elderly male is known as a smoker presented with chronic cough, significant weight loss, and fatigue. Serum calcium level is raised. A lung biopsy was done, and it showed large atypical cells with hyperchromasia. What is the probable diagnosis?

Large cell carcinoma. ***Squamous cell carcinoma*** - The presence of **hyperchromatic atypical cells** in the lung biopsy [2] and **elevated serum calcium levels** are indicative of paraneoplastic hypercalcemia often seen in squamous cell carcinoma. - This type of lung cancer typically occurs in **smokers** [1] and is associated with **chronic cough** and **weight loss**. *Large cell neuroendocrine tumor* - While it may show large atypical cells, this tumor type is less commonly associated with **hypercalcemia** or the smoking history highlighted here. - Characteristically, it tends to have a more aggressive course and distinct histological features not indicated in the vignette. *Small cell carcinoma* - This type typically presents with **central lung lesions** and is associated with secretory syndromes like **SIADH**, not hypercalcemia. - Histologically, it features small round blue cells rather than the large atypical cells described in this case. *Adenocarcinoma* - Often arises peripherally in the lung and typically does not present with hypercalcemia. - Histological features include **gland formation**, which contrasts with the **large atypical cells** noted in the biopsy. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Respiratory Tract Disease, pp. 336-337. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, pp. 723-724.

Q: What is the T stage classification for a lung carcinoma measuring 2.5 cm and not involving the pleura?

T1c (tumor > 2 cm but ≤ 3 cm). ***T1c (tumor > 2 cm but ≤ 3 cm)*** - A lung carcinoma measuring 2.5 cm falls within the **T1c classification** because it is greater than 2 cm but no larger than 3 cm. - The absence of **pleural involvement** confirms this is not a higher T stage (T2 or above) [1]. - According to the **8th Edition TNM Classification**, T1c specifically denotes tumors in this size range [1]. *T1a (tumor ≤ 1 cm)* - This classification is for tumors that are **1 cm or less in greatest dimension**, which is much smaller than the 2.5 cm tumor in the question. - T1a represents the **smallest category** of primary lung tumors [1]. *T2 (tumor > 3 cm)* - A T2 classification applies to tumors that are **larger than 3 cm** (T2a: > 3-4 cm, T2b: > 4-5 cm), which does not apply to a 2.5 cm tumor [1]. - T2 can also include smaller tumors with specific features like **visceral pleural invasion**, **main bronchus involvement**, or causing **atelectasis/obstructive pneumonitis**, none of which are present here [1]. *T1b (tumor > 1 cm but ≤ 2 cm)* - This classification applies to tumors **greater than 1 cm but not exceeding 2 cm** in greatest dimension. - The 2.5 cm tumor in the question **exceeds this size range**, making T1b incorrect [1]. - T1b represents an intermediate size between T1a and T1c [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, p. 725.

Q: In Respiratory Distress Syndrome (RDS) in a child, which type of cells are found to be defective?

Type II pneumocytes. ***Type II pneumocytes*** - **Type II pneumocytes** are specialized cells responsible for producing and secreting **surfactant**, a lipoprotein complex that reduces surface tension in the alveoli and prevents alveolar collapse. - In **Respiratory Distress Syndrome (RDS)**, particularly in premature infants, these cells are **immature or insufficient**, leading to inadequate surfactant production, increased alveolar surface tension, and subsequent alveolar collapse with impaired gas exchange. - This is the primary cellular defect in RDS, making Type II pneumocytes the correct answer. *Type 1 pneumocytes* - **Type I pneumocytes** are thin, flattened squamous cells that cover approximately 95% of the alveolar surface area and are primarily responsible for **gas exchange**. - While essential for respiratory function, they do not produce surfactant and are not the defective cell type in RDS. *Bronchial epithelium* - The **bronchial epithelium** lines the conducting airways and consists of ciliated columnar cells involved in **mucociliary clearance** and airway protection. - Defects in bronchial epithelium are associated with conditions like asthma, chronic bronchitis, or cystic fibrosis, not with RDS. *Macrophages* - **Alveolar macrophages** are immune cells residing in the alveolar spaces, responsible for phagocytosis of pathogens and debris. - While they play important roles in pulmonary defense and can be affected in various lung diseases, they are not the primary defective cell type in RDS, which is fundamentally a surfactant deficiency disorder.

Q: A 35-year-old woman with a long history of dyspnea, chronic cough, sputum production, and wheezing dies of respiratory failure following a bout of lobar pneumonia. She was not a smoker or an alcoholic. Which of the following underlying conditions is most likely associated with the pathologic changes shown in the lung autopsy?

Alpha-1 antitrypsin deficiency. ***Alpha 1 antitrypsin deficiency*** - This condition leads to **accumulation of abnormal protein** in the liver and lungs, resulting in emphysema, which is consistent with chronic cough and dyspnea [1]. - Patients often develop **lung pathology** similar to what is seen in smokers, making it plausible given the patient's background [1]. *Mutation in dynein arms* - This is associated with **primary ciliary dyskinesia**, which presents with recurrent respiratory infections but is not typical in non-smokers or in the context of **dyspnea with chronic cough**. - Usually linked to **situs inversus** and **recurrent infections**, neither of which is highlighted here. *Antibodies against type 4 collagen* - This condition is related to **Goodpasture syndrome**, which typically results in **hemoptysis** and **renal failure**, rather than chronic cough and sputum production. - The predominant involvement in this syndrome does not align with the clinical presentation of **chronic lung disease** noted in this patient. *Cystic fibrosis* - While it causes **chronic respiratory symptoms**, it is usually seen in younger patients and is associated with **pancreatic insufficiency** and **salty sweat**. - The age of the patient and symptom progression does not fit well with a diagnosis of cystic fibrosis. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, pp. 683-684.

Q: Identify the condition shown in the image of a lung.

Lobar Pneumonia. ***Lobar Pneumonia*** - Typically presents as a **consolidation** in a specific lobe of the lung, often observed in imaging with **well-defined borders** [1][2]. - Associated with acute signs such as **fever** and **productive cough**, indicating a localized infection [1][2]. *Congested kidney* - Primarily characterized by **enlargement** and **dark, red appearance** due to increased blood flow, not indicative of a respiratory condition. - Presents with symptoms related to renal impairment such as **hematuria** and **edema**, unlike the respiratory symptoms in pneumonia. *Bronchopneumonia* - Differs in pattern, typically resulting in **patchy infiltrates** throughout the lung fields rather than localized lobe involvement. - Often presents with **scattered crackles** and a **less severe clinical picture** compared to lobar pneumonia. *Acute glomerulonephritis* - A renal condition manifesting through **hematuria**, **proteinuria**, and **hypertension**, with no respiratory symptoms. - Not associated with lung imaging changes, as it primarily affects kidney function and structure. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, pp. 711-712. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Respiratory Tract Disease, pp. 317-318.

Q: Identify the condition represented in the image.

Miliary tuberculosis. ***Miliary tuberculosis*** - The image displays lungs riddled with numerous small (1-5 mm), uniform **granulomas**, resembling millet seeds, which is characteristic of **miliary tuberculosis**. - This pattern results from the **hematogenous dissemination** of **Mycobacterium tuberculosis** throughout the body, including the lungs. *Bronchiectasis* - Bronchiectasis is characterized by **irreversible dilation of bronchi** with chronic inflammation and infection, which would appear as dilated airways and associated scarring on gross pathology, not diffuse small nodules. - While it can be a complication of tuberculosis, the primary gross feature in the image is not dilated bronchi. *COPD* - Chronic Obstructive Pulmonary Disease (COPD) typically manifests as **emphysema** (enlarged airspaces with destruction of alveolar walls) or **chronic bronchitis** (mucus gland hypertrophy and inflammation of airways). - These conditions would present with large areas of destroyed lung tissue, mucous plugging, or thickened bronchial walls, which are distinctly different from the numerous small nodules seen in the image. *Lung cancer* - Lung cancer usually presents as a **mass or nodule**, which can be solitary or multiple, but typically larger and more irregular than the uniform small nodules in this image. - While metastatic lung cancer can present with multiple nodules, the uniform size and diffuse distribution seen here are far more typical of miliary spread of an infection.

Q: Most common cause of idiopathic interstitial pneumonia is

Idiopathic pulmonary fibrosis. ***Idiopathic pulmonary fibrosis (IPF)*** - This is the **most common** form of idiopathic interstitial pneumonia, accounting for approximately **50-60% of all IIP cases** - Represents the **most severe** IIP subtype with poor prognosis - Characterized by progressive **usual interstitial pneumonia (UIP) pattern** with fibroblastic foci and honeycombing - Presents with progressive dyspnea, dry cough, and restrictive lung disease *Organizing pneumonia* - While **Cryptogenic Organizing Pneumonia (COP)** is a form of idiopathic interstitial pneumonia, it is **much less common than IPF** [1] - Characterized by **intra-alveolar granulation tissue (Masson bodies)** [1] - Better prognosis and steroid-responsive compared to IPF [1] *Sarcoidosis* - This is **NOT classified as an idiopathic interstitial pneumonia** - It is a separate **multisystem granulomatous disease** with **non-caseating granulomas** - Has a distinct etiology related to altered immune response - Does not belong to the IIP classification system *Lipoid pneumonia* - This is **NOT an idiopathic interstitial pneumonia** - Results from **aspiration of lipid substances** causing exogenous lipoid pneumonia - Has a **known extrinsic cause**, therefore not "idiopathic" - Not part of the IIP classification **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Respiratory Tract Disease, pp. 330-331.

Q: Most common lung cancer in non-smokers is:

Adenocarcinoma. ***Adenocarcinoma*** - **Adenocarcinoma** is the most common type of lung cancer found in non-smokers, often associated with peripheral lung nodules. - This subtype has a rising incidence rate, particularly among women and younger individuals, often linked to factors like **environmental exposures** or **genetics**. *None of the above* - This option is incorrect since adenocarcinoma is a recognized **primary lung cancer** type in non-smokers. - The statement does not address the specific cancer types and neglects to acknowledge the commonality of adenocarcinoma. *Squamous cell carcinoma* - Generally associated with smoking [1,2] and presents centrally in the lungs, making it less common among non-smokers. - Often linked to **cavitary lesions** [1] and associated with **hypercalcemia** due to parathyroid hormone-related peptide secretion. *Oat cell carcinoma* - Also known as small cell lung cancer (SCLC), is primarily linked to smoking and has a **very aggressive** nature. - Typically arises in the central airways and is associated with **paraneoplastic syndromes**, which are not relevant to the non-smoker context. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Respiratory Tract Disease, pp. 336-337. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, pp. 720-721.

Q: Which histological type of lung cancer is most commonly associated with metastasis?

Small cell carcinoma. ***Squamous cell CA*** - Known for its **aggressive nature** and propensity to metastasize, particularly in later stages. - Typically arises in the **central part of the lungs**, often associated with smoking and leads to local invasion and distant spread. *Alveolar-carcinoma* - Rarely found and tends to be **less aggressive** compared to squamous cell carcinoma. - Usually has a more localized effect without the same potential for widespread metastasis. *Small cell carcinoma* - Although it is **highly metastatic**, it is less common than squamous cell carcinoma in terms of overall lung cancer incidence. - Characterized by its rapid growth and early metastasis [1], but mostly associated with a specific subtype of lung cancer cases. *Adenocarcinoma* - Generally presents as a **peripheral lung lesion** and has **less propensity for early metastasis** compared to squamous cell carcinoma. - More common in non-smokers and tends to have a less aggressive metastatic pattern. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Respiratory Tract Disease, pp. 337-338.

Q: Heart failure cells are seen in -

Pulmonary edema. ***Pulmonary edema*** - Heart failure cells, or **hemosiderin-laden macrophages**, are typically found in the lungs during pulmonary edema due to left-sided heart failure [1]. - This condition leads to **increased pulmonary capillary pressure**, causing leakage of red blood cells into the alveoli, which macrophages then phagocytose [1]. *Pulmonary abscess* - Characterized by a **localized collection of pus** within the lung, typically due to infection, rather than heart failure. - Does not typically involve **hemosiderin-laden macrophages** indicative of chronic pulmonary congestion. *Pulmonary infarction* - Causes **tissue death** due to obstruction of blood flow, leading to necrosis rather than heart failure cells. - Typically presents with **infarcted lung tissue**, showing a different pathological process than seen in heart failure. *PulmonaryTB* - Primarily caused by **Mycobacterium tuberculosis**, leading to cavitary lesions and granulomatous inflammation, not heart failure cells. - The presence of **caseating granulomas** is characterized but does not indicate chronic pulmonary congestion. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Heart, pp. 536-538.

Question 1

An elderly male is known as a smoker presented with chronic cough, significant weight loss, and fatigue. Serum calcium level is raised. A lung biopsy was done, and it showed large atypical cells with hyperchromasia. What is the probable diagnosis?

Accepted Answer

Large cell carcinoma

Answer

Small cell lung carcinoma

Answer

Squamous cell carcinoma

Answer

Lung adenocarcinoma

Question 2

What is the T stage classification for a lung carcinoma measuring 2.5 cm and not involving the pleura?

Accepted Answer

T1c (tumor > 2 cm but ≤ 3 cm)

Answer

T1a (tumor ≤ 1 cm)

Answer

T2 (tumor > 3 cm)

Answer

T1b (tumor > 1 cm but ≤ 2 cm)

Question 3

In Respiratory Distress Syndrome (RDS) in a child, which type of cells are found to be defective?

Accepted Answer

Type II pneumocytes

Answer

Macrophages

Answer

Type 1 pneumocytes

Answer

Bronchial epithelium

Question 4

A 35-year-old woman with a long history of dyspnea, chronic cough, sputum production, and wheezing dies of respiratory failure following a bout of lobar pneumonia. She was not a smoker or an alcoholic. Which of the following underlying conditions is most likely associated with the pathologic changes shown in the lung autopsy?

Accepted Answer

Alpha-1 antitrypsin deficiency

Answer

Antibodies against type 4 collagen (associated with Goodpasture syndrome)

Answer

Cystic fibrosis (a genetic disorder affecting the lungs)

Answer

Mutation in dynein arms (associated with primary ciliary dyskinesia)

Question 5

Identify the condition shown in the image of a lung.

Accepted Answer

Lobar Pneumonia

Answer

Bronchopneumonia

Answer

Acute glomerulonephritis

Answer

Congested kidney

Question 6

Identify the condition represented in the image.

Accepted Answer

Miliary tuberculosis

Answer

Bronchiectasis

Answer

COPD

Answer

Lung cancer

Question 7

Most common cause of idiopathic interstitial pneumonia is

Accepted Answer

Idiopathic pulmonary fibrosis

Answer

Organizing pneumonia

Answer

Sarcoidosis

Answer

Lipoid pneumonia

Question 8

Most common lung cancer in non-smokers is:

Accepted Answer

Adenocarcinoma

Answer

Squamous cell carcinoma

Answer

Oat cell carcinoma

Answer

Large cell carcinoma

Question 9

Which histological type of lung cancer is most commonly associated with metastasis?

Accepted Answer

Small cell carcinoma

Answer

Squamous cell carcinoma

Answer

Adenocarcinoma

Answer

Large cell carcinoma

Question 10

Heart failure cells are seen in -

Accepted Answer

Pulmonary edema

Answer

Pulmonary infarction

Answer

Pulmonary abscess

Answer

Pulmonary tuberculosis

Respiratory Pathology — MCQs

Respiratory Pathology — MCQs

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