Respiratory Pathology Practice Questions

Q: Radiotherapy induced radiation pneumonitis is mediated by all of the following cytokines and factors except -

PAF. ***PAF*** - **Platelet-activating factor (PAF)** is primarily involved in **anaphylaxis**, **asthma**, and **allergic responses**, mediating inflammation through platelet aggregation and smooth muscle contraction. - While it has pro-inflammatory effects, it is **not a primary mediator** of the specific inflammatory cascade seen in radiotherapy-induced radiation pneumonitis. *TNF-α* - **Tumor Necrosis Factor-alpha (TNF-α)** is a crucial **pro-inflammatory cytokine** that plays a significant role in the initial acute phase of radiation pneumonitis. - It induces **cytotoxicity**, **apoptosis**, and the production of other inflammatory mediators, contributing to lung tissue damage. *TGF-β* - **Transforming Growth Factor-beta (TGF-β)** is a key cytokine involved in the **fibrotic phase** of radiation pneumonitis. - It promotes **fibroblast proliferation**, collagen synthesis, and extracellular matrix deposition, leading to lung scarring. *NF-kB* - **Nuclear Factor kappa-light-chain-enhancer of activated B cells (NF-kB)** is a master **transcription factor** that regulates the expression of numerous genes involved in inflammation and immune responses. - Radiation exposure **activates NF-kB**, leading to the transcription of various pro-inflammatory cytokines, including TNF-α, which contribute to radiation pneumonitis.

Q: Curschmann's spirals are seen in which condition?

Bronchial asthma. ***Bronchial asthma*** - **Curschmann's spirals** are spiral-shaped mucus plugs found in the sputum of patients with **bronchial asthma**. - They represent casts from small bronchi and are formed from **mucus and cellular debris** within the airways during an asthmatic exacerbation. *Bronchiectasis* - Characterized by **permanent abnormal dilation** of the bronchi due to chronic inflammation and infection, leading to productive cough and recurrent respiratory infections. - While it involves mucous production, it is typically associated with **purulent sputum** due to bacterial colonization, not necessarily Curschmann's spirals. *Chronic bronchitis* - Defined clinically by a **chronic productive cough** for at least three months in each of two successive years, without other causes. - Involves mucus hypersecretion and inflammation, but **Curschmann's spirals are not a characteristic finding** compared to asthma. *Wegener's granulomatosis (Granulomatosis with Polyangiitis)* - This is a systemic **vasculitis** affecting small to medium-sized blood vessels, typically involving the upper and lower respiratory tracts and kidneys. - Its pulmonary manifestations include **nodules, cavities, and diffuse alveolar hemorrhage**, and sputum findings are related to inflammation and bleeding, not Curschmann's spirals.

Q: Which of the following statements is MOST accurate regarding adenocarcinoma of the lung?

Most commonly found in peripheral lung tissue. ***More common in female*** - Adenocarcinoma of the lung has a higher incidence in **female** patients compared to other types of lung cancer. - This is especially relevant in **non-smokers** where adenocarcinoma is often more prevalent among women. *Upper lobe involvement is most common* - Typically, adenocarcinoma is often found in the **peripheral** regions of the lung [1] and not specifically in the upper lobes. - Upper lobe predominance is more characteristic of **squamous cell carcinoma** rather than adenocarcinoma [2]. *Central cavitations* - Adenocarcinoma generally presents as **solid masses** and **nodules** rather than central lesions with cavitations. - Cavitary lesions are more commonly associated with **squamous cell carcinoma** [2] or certain infections like **tuberculosis**. *Smoking is not associated with* - In fact, smoking is a significant risk factor for adenocarcinoma [3], although it is often considered less directly related compared to **squamous cell carcinoma**. - The incidence in smokers is notable, but adenocarcinoma can also occur in **non-smokers**, complicating this association. **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. 336-337. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, pp. 721-723.

Q: Ferruginous bodies are seen in:

Asbestosis. ***Asbestosis*** - Ferruginous bodies are specifically associated with **exposure to asbestos**, which leads to asbestosis [1]. - These bodies are seen as **siderophilic structures** resembling a "dumbbell" shape under the microscope, which are indicative of this condition [1]. *Bagassosis* - Caused by exposure to **bagasse dust**, primarily from sugarcane, leading to allergic alveolitis rather than ferruginous bodies [1]. - Histopathology typically shows **lymphocytic infiltration** and non-caseating granulomas, not ferruginous bodies. *Byssinosis* - This is associated with inhalation of **cotton dust** and primarily results in **bronchoconstriction** and respiratory symptoms rather than ferruginous bodies. - Characterized by a **respiratory illness** that worsens at the beginning of the work week, missing the key features of asbestosis. *Silicosis* - Resulting from exposure to **silica dust**, this condition leads to macules and nodules in the lungs instead of ferruginous bodies [1]. - The hallmark findings are **hyaline nodules** on imaging and not the abnormal iron-containing structures seen in asbestosis. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, pp. 695, 698-699.

Q: The earliest lesion seen in asbestosis is:

Pleural plaques. ***Pleura plaques*** - The earliest lesion in asbestosis is characterized by the development of **pleural plaques**, which are indicative of asbestos exposure [1]. - These plaques are often asymptomatic but are a strong marker for previous exposure to **asbestos fibers** [1]. *Mesothelioma* - While **mesothelioma** is associated with asbestos exposure, it is a malignant tumor that typically arises years after the initial exposure and isn't the earliest lesion [1,3]. - This condition usually presents with pleuritic symptoms and effusions, occurring much later than pleural plaques [2]. *Hilar lymphadenopathy* - Hilar lymphadenopathy may indicate lung disease, but it is not a direct lesion associated with asbestosis and does not present as the earliest finding. - Commonly seen in various conditions like **sarcoidosis**, it signifies **lymph node enlargement** rather than a direct effect of asbestos. *Adenoma lung* - Lung adenomas are benign lesions that are not directly tied to asbestosis exposure and occur independently of asbestos-related diseases. - This option fails to recognize that the characteristic **asbestos-related lesions** develop much differently than a lung adenoma. **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. 339-340.

Q: Which of the following features is NOT typically seen in viral pneumonia?

Predominance of alveolar exudate. ### Predominance of alveolar exudate - Viral pneumonia typically involves the **interstitium**, leading to interstitial inflammation, rather than a significant accumulation of **exudate** within the alveoli [3]. - **Alveolar exudate** is more characteristic of **bacterial pneumonia**, where neutrophils and fibrin fill the alveolar spaces [1], [2], [3]. ### Presence of interstitial inflammation - This is a **hallmark pathological feature** of viral pneumonia, where inflammatory cells infiltrate the alveolar septa and peribronchial tissues [3]. - The inflammation primarily involves the **walls of the alveoli** and the **surrounding connective tissue**, not the alveolar lumen. ### Bronchiolitis - Viral infections, especially in children, often affect the **small airways (bronchioles)**, causing inflammation and obstruction. - This can lead to symptoms such as **wheezing** and **dyspnea** in viral pneumonia. ### Multinucleate giant cells in the bronchiolar wall - The presence of **multinucleate giant cells** is a specific histological finding associated with certain viral pneumonias, particularly those caused by **measles** and **respiratory syncytial virus (RSV)**. - These cells arise from the fusion of infected cells and are found within the bronchiolar epithelium and lumen. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Respiratory Tract Disease, pp. 317-318. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, pp. 711-712. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, p. 715.

Q: Small deposits of neuroendocrine cell hyperplasia in scarred lungs are known as:

Tumorlet. ***Tumorlet*** - Small deposits of **neuroendocrine cell hyperplasia** in scarred lungs are specifically referred to as tumorlets, which can be associated with various lung diseases. - Tumorlets are typically benign, comprising **small clusters of neuroendocrine cells** that are usually found in pulmonary scars. *Teratoma* - Teratomas are **germ cell tumors** that typically contain tissue from all three embryonic layers and are not associated with neuroendocrine cell hyperplasia. - They usually occur in **gonadal** sites or mediastinum and do not relate to scarring in lung tissue. *Carcinoid* - Carcinoids are **neuroendocrine tumors** but larger and more defined than tumorlets, often causing obstruction or symptoms. - Unlike tumorlets, carcinoids present as **solitary masses**, typically found in the gastrointestinal tract or lungs but not as small deposits in scarred tissue. *Hamartoma* - Hamartomas are benign tumors made of **disorganized tissue** native to the organ in which they arise, but they do not involve neuroendocrine cells specifically [1]. - They are generally characterized as **well-circumscribed** nodules and do not correlate with neuroendocrine hyperplasia in scarred lungs [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, pp. 727-728.

Question 1

Radiotherapy induced radiation pneumonitis is mediated by all of the following cytokines and factors except -

Accepted Answer

PAF

Answer

NF-kB

Answer

TNF-α

Answer

TGF-β

Question 2

Curschmann's spirals are seen in which condition?

Accepted Answer

Bronchial asthma

Answer

Bronchiectasis

Answer

Chronic bronchitis

Answer

Wegener's granulomatosis

Question 3

Which of the following statements is MOST accurate regarding adenocarcinoma of the lung?

Accepted Answer

Most commonly found in peripheral lung tissue

Answer

Smoking is associated with adenocarcinoma

Answer

Typically presents with central cavitations

Answer

Relatively more common in non-smokers compared to other lung cancer types

Question 4

Ferruginous bodies are seen in:

Accepted Answer

Asbestosis

Answer

Silicosis

Answer

Byssinosis

Answer

Bagassosis

Question 5

Hypersensitivity pneumonitis due to prolonged inhalation of dust is a characteristic feature of Maltworker's lung, which is caused by:

Accepted Answer

Aspergillus clavatus

Answer

Pseudomonas

Answer

Micropolyspora faeni

Answer

Aspergillus fumigatus

Question 6

The earliest lesion seen in asbestosis is:

Accepted Answer

Pleural plaques

Answer

Mesothelioma

Answer

Hilar lymphadenopathy

Answer

Adenoma of the lung

Question 7

Which of the following features is NOT typically seen in viral pneumonia?

Accepted Answer

Predominance of alveolar exudate

Answer

Bronchiolitis

Answer

Multinucleate giant cells in the bronchiolar wall

Answer

Presence of interstitial inflammation

Question 8

What is the terminal stage of pneumonia?

Accepted Answer

Resolution

Answer

Congestive stage

Answer

Red hepatization

Answer

Gray hepatization

Question 9

Small deposits of neuroendocrine cell hyperplasia in scarred lungs are known as:

Accepted Answer

Tumorlet

Answer

Teratoma

Answer

Carcinoid

Answer

Hamartoma

Respiratory Pathology — MCQs

Respiratory Pathology — MCQs

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