Respiratory Pathology Practice Questions

Q: In RDS in a child, which cells are found defective?

Type 2 pneumocytes. ***Type 2 pneumocytes*** - **Type 2 pneumocytes** are responsible for producing **surfactant**, which reduces surface tension in the alveoli and prevents their collapse [2], [3]. - In **Respiratory Distress Syndrome (RDS)**, especially in premature infants, these cells are immature or insufficient, leading to **surfactant deficiency** [1]. - This is the **primary cellular defect** in RDS, making it the correct answer [2]. *Bronchial epithelium* - The **bronchial epithelium** primarily lines the conducting airways and is involved in mucociliary clearance, not surfactant production. - Defects in this epithelium are associated with conditions like **bronchitis** or **asthma**, not the primary pathogenesis of RDS. *Type 1 pneumocytes* - **Type 1 pneumocytes** are thin, flat cells that form the majority of the alveolar surface (95%) and are crucial for gas exchange. - While they are affected by the damage in RDS, their primary defect is not the cause of the disease; the underlying problem is **surfactant deficiency** from Type 2 pneumocytes [2]. *Clara cells* - **Clara cells** (now called club cells) are non-ciliated secretory cells found in the bronchioles that produce Clara cell secretory protein (CCSP). - They play a role in detoxification and immune modulation but are **not responsible for surfactant production** or the pathogenesis of RDS. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 465-466. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Respiratory Tract Disease, pp. 313-314. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, p. 466.

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

Lobar pneumonia. ***Lobar Pneumonia*** - Characterized by **consolidation of lung lobes** due to infection, commonly seen in cases of **Streptococcus pneumoniae** [1]. - Classic clinical features include **fever, cough, and difficulty breathing**, often with rust-colored sputum. *Congested kidney* - Indicates **kidney enlargement and edema** due to vascular congestion, often associated with heart failure. - Symptoms primarily relate to **renal function decline**, not pulmonary involvement. *Bronchopneumonia* - Typically shows **patchy consolidations** throughout different lung regions [2] [3], rather than a single lobe. - More common in **post-viral infections** and associated with a **sicker patient overall** [3], presenting diffuse symptoms. *Acute glomerulonephritis* - Primarily a **renal condition** resulting in hematuria and proteinuria, with **no respiratory involvement**. - Often follows infections, such as from **streptococci**, manifesting as nephritic syndrome rather than pneumonia symptoms. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, pp. 709-712. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Respiratory Tract Disease, pp. 317-318. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Respiratory Tract Disease, pp. 316-317.

Q: Granulomatous lung disease is caused by?

Sarcoidosis. Hypersensitivity pneumonitis - This condition leads to an immune-mediated inflammatory response in the lungs, resulting in granuloma formation [1]. - Associated with exposure to organic antigens, such as mold spores or animal proteins, which trigger a hypersensitivity reaction [1]. Sarcoma - Sarcomas are malignant tumors arising from mesenchymal tissues, not typically associated with granulomatous inflammation in the lungs. - They present as mass lesions rather than diffuse lung disease with granuloma formation. Bronchogenic carcinoma - This type of cancer arises from the lung epithelium and typically presents with malignant cell proliferation, not granulomatous lesions. [1] - Symptoms are often more consistent with obstructive lung disease rather than the immune response seen in granulomatous conditions. Bronchogenic cyst - A bronchogenic cyst is a developmental anomaly that is a cystic lesion located in the mediastinum or lung but does not involve granulomatous lung disease. - It usually has no inflammatory reaction associated with it and is not caused by an immune response.

Q: Which of the following statements about silicosis is true?

It is associated with tuberculosis.. ***Associated with tuberculosis*** - Silicosis significantly increases the risk of developing **tuberculosis** due to silicate dust impairing immune function in the lungs [1]. - There is a clear **epidemiological link** between silicosis and the incidence of pulmonary tuberculosis [1]. *Produces pleural plaque* - Pleural plaques are more characteristic of **asbestosis**, not silicosis [3]; silicosis typically involves **nodular interstitial fibrosis** [2]. - Silicosis primarily leads to **nodules** in the upper lung zones rather than pleural changes like plaques [2]. *Lower lobe infiltration* - Silicosis typically shows **upper lobe** involvement with nodular opacities rather than lower lobe infiltrations seen in other diseases like asbestosis or pulmonary edema [2]. - The lung radiology in silicosis is distinct, characterized by **upper lobe fibrosis** rather than localized lower lobe changes. *All* - Since only one option regarding silicosis is true, this blanket statement lacks accuracy; not all statements listed are correct. - Each detail must be evaluated individually, and not all represent true aspects of silicosis, making "all" an incorrect conclusion. **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. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, p. 695.

Q: Which of the following is a characteristic feature of chronic bronchitis?

Increase in the number and size of mucus-secreting glands. ***Bronchiolitis obliterans*** - Chronic bronchitis is often associated with ends of the bronchi, leading to **peripheral airway obstruction**, which may evolve into bronchiolitis obliterans [1]. - It manifests as progressive **dyspnea** and chronic cough due to significant **airway inflammation** and damage [1]. *Decrease in Reid index* - The Reid index (ratio of gland size to airway size) typically **increases** in chronic bronchitis due to mucous gland hyperplasia. - A decrease would suggest a **shift towards airway obstruction** rather than gland enlargement. *Increase in number of glands without any change in size* - Chronic bronchitis involves an **increase in both number and size** of mucous glands, as seen in the Reid index. - This oes not accurately reflect the **pathological changes** that occur in this condition. *Only large airways are involved* - Chronic bronchitis affects both **large and small airways**, including the terminal bronchioles [1]. - This misrepresents the widespread impact of the disease on the **entire bronchial tree**, not limited to larger airways. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, pp. 685-686.

Q: Anthracosis is due to inhalation of?

Coal dust. ***Coal dust*** - Anthracosis is primarily caused by the inhalation of **coal dust**, leading to carbon accumulation in the lungs [1]. - This condition is commonly associated with **coal miners** and is a type of **pneumoconiosis** [1]. *Asbestos* - Inhalation of **asbestos fibers** leads to conditions like **asbestosis** and **mesothelioma**, not anthracosis [1]. - Symptoms include **lung fibrosis** and are characterized by a different pathophysiological pattern. *Beryllium dust* - Exposure to **beryllium dust** can cause **berylliosis**, which manifests as a chronic lung disease involving granuloma formation [1]. - It is a distinct condition and does not relate to the carbon deposits seen in anthracosis. *Silica dust* - Inhalation of **silica dust** causes **silicosis**, characterized by nodular lung disease and is distinct from anthracosis [1]. - Silicosis is associated with **mining** and **stone cutting**, not coal dust inhalation. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, p. 695.

Q: Which type of pneumoconiosis is most commonly associated with tuberculosis (TB)?

Silicosis. ***Silicosis*** - The most common type of pneumoconiosis, **silicosis**, is specifically associated with an increased risk of developing **tuberculosis (TB)** due to the immune suppression caused by silica dust exposure [1]. - Characterized by **reticular opacities** and **nodules** on chest imaging, it leads to progressive lung impairment and predisposes patients to TB reactivation. *Bysinosis* - Caused by exposure to **cotton dust**, leading to respiratory symptoms, it is not closely linked with TB. - Primarily affects **textile workers** and presents with symptoms like shortness of breath but lacks the association with **lung fibrosis** or TB risks seen in silicosis. *Asbestosis* - Resulting from asbestos exposure, it leads to **interstitial fibrosis** and is primarily associated with lung cancer and mesothelioma, rather than TB. - While it causes significant respiratory issues, it does not have the same predisposition to TB as seen with silicosis. *Baggassosis* - A less common type of pneumoconiosis caused by inhalation of **sugarcane dust**, leading to respiratory problems but is not associated with TB. - It primarily affects **agricultural workers** and involves respiratory symptoms but lacks the defining features relevant to TB risk. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, pp. 697-698.

Q: Metastasis to lungs comes most commonly from

Breast carcinoma. ***Breast carcinoma*** - **Breast cancer** is one of the most common sources of pulmonary metastases, spreading via **hematogenous** [3] or lymphatic routes. [1] - The lungs are a frequent site for distant metastasis, and breast cancer accounts for a significant proportion due to its **high prevalence** and rich vascular supply. [1] - Other common sources include colorectal, renal, thyroid, and prostate carcinomas. [1] *Primary brain tumor* - **Primary brain tumors** (gliomas, medulloblastomas) rarely metastasize outside the central nervous system. - They typically lack the ability to penetrate the **dura mater** and enter systemic circulation effectively. - While they can spread via CSF within the CNS, distant metastasis to lungs is **extremely rare**. *Primary bone tumor* - **Primary bone tumors** are typically **sarcomas** (osteosarcoma, Ewing sarcoma), not carcinomas. [2] - While osteosarcoma does metastasize to lungs frequently, these tumors are much **less common** overall than breast cancer. [2] - In terms of absolute numbers, breast cancer is a more frequent source of lung metastases. *Melanoma* - Melanoma has aggressive metastatic potential and can spread to virtually any organ, including the lungs. [1] - However, due to the **higher incidence** of breast cancer, breast remains a more common source of pulmonary metastases in clinical practice. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Respiratory Tract Disease, pp. 338-339. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Osteoarticular And Connective Tissue Disease, pp. 671-672. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Liver And Biliary System Disease, pp. 456-457.

Q: In which type of lung carcinoma is the p53 mutation most commonly observed?

Squamous cell carcinoma (SCC). ***Small cell carcinoma*** - **Small cell lung carcinoma (SCLC)** has the highest frequency of **p53 mutations**, occurring in approximately **90-95%** of cases. - These mutations are associated with the **aggressive nature** and **poor prognosis** of SCLC, contributing to its rapid growth and early metastasis. *Adenocarcinoma* - **Adenocarcinoma** has p53 mutations in approximately **50-60%** of cases, which is less frequent than SCLC. - This subtype is more commonly associated with **EGFR mutations** and **ALK rearrangements**, particularly in non-smokers. *Squamous cell carcinoma (SCC)* - **Squamous cell carcinoma** shows p53 mutations in about **70-80%** of cases, but still lower than SCLC. - It is more strongly associated with **smoking** and often displays mutations in **CDKN2A** and **PIK3CA** pathways. *Large cell carcinoma* - **Large cell carcinoma** has variable p53 mutation rates, typically **40-60%** of cases. - This subtype is less well-characterized molecularly and represents a **diagnosis of exclusion** among lung cancers.

Q: In which condition is Calretinin primarily used as a diagnostic marker?

Malignant Mesothelioma. ***Mesothelioma*** - **Calretinin** is a sensitive marker used specifically for diagnosing **mesothelioma**, particularly in differentiating it from adenocarcinomas [1]. - It is expressed in **mesothelial cells**, making it a crucial tool in immunohistochemical staining for tumor identification [1]. *Hamartoma* - **Hamartomas** typically do not express **calretinin**, and their diagnosis requires different markers based on the tissue type involved. - They are benign and can occur in various organs but do not show mesothelial characteristics. *Chordoma* - **Chordomas** are malignant tumors originating from notochordal remnants, and they are not associated with **calretinin** positivity. - They are usually **mucins-positive** and identified using other specific markers, such as **brachyury**. *Choristoma* - **Choristomas** are benign lesions of ectopic tissue, and like hamartomas, they do not express **calretinin**. - These tumors are often diagnosed based on the specific type of tissue they contain rather than immunohistochemistry. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, p. 731.

Question 1

In RDS in a child, which cells are found defective?

Accepted Answer

Type 2 pneumocytes

Answer

Bronchial epithelium

Answer

Type 1 pneumocytes

Answer

Clara cells

Question 2

Identify the condition shown in the image of the lung.

Accepted Answer

Lobar pneumonia

Answer

Bronchopneumonia

Answer

Pulmonary infarction

Answer

Lung abscess

Question 3

Granulomatous lung disease is caused by?

Accepted Answer

Sarcoidosis

Answer

Bronchogenic carcinoma

Answer

Infection

Answer

Hypersensitivity pneumonitis

Question 4

Which of the following statements about silicosis is true?

Accepted Answer

It is associated with tuberculosis.

Answer

It produces pleural plaques.

Answer

It causes lower lobe infiltration.

Answer

All of the options.

Question 5

Which of the following is a characteristic feature of chronic bronchitis?

Accepted Answer

Increase in the number and size of mucus-secreting glands

Answer

Bronchiolitis obliterans

Answer

Increase in Reid index

Answer

Involvement of both large and small airways

Question 6

Anthracosis is due to inhalation of?

Accepted Answer

Coal dust

Answer

Asbestos

Answer

Silica dust

Answer

Beryllium dust

Question 7

Which type of pneumoconiosis is most commonly associated with tuberculosis (TB)?

Accepted Answer

Silicosis

Answer

Asbestosis

Answer

Bagassosis

Answer

Byssinosis

Question 8

Metastasis to lungs comes most commonly from

Accepted Answer

Breast carcinoma

Answer

Melanoma

Answer

Primary brain tumor

Answer

Primary bone tumor

Question 9

In which type of lung carcinoma is the p53 mutation most commonly observed?

Accepted Answer

Squamous cell carcinoma (SCC)

Answer

Adenocarcinoma

Answer

Large cell carcinoma

Answer

Small cell carcinoma

Question 10

In which condition is Calretinin primarily used as a diagnostic marker?

Accepted Answer

Malignant Mesothelioma

Answer

Benign Hamartoma

Answer

Choristoma

Answer

Chordoma

Respiratory Pathology — MCQs

Respiratory Pathology — MCQs

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