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: What is the final stage of pneumonia characterized by the resolution of lung inflammation?

Resolution. ***Resolution*** - The terminal stage of pneumonia is characterized by the **resolution** phase, where the inflammatory process subsides and lung tissue begins to heal [1][2]. - During this phase, clinical symptoms improve, and the lungs return to normal function after patient recovery [2]. *Congestion* - This phase occurs early in pneumonia, presenting with increased vascularity and **fluid accumulation** in alveoli before infection resolution [1][3]. - It involves **edema** and a lack of significant resolution, contrary to the final stages of pneumonia [3]. *Red hepatization* - This stage typically happens during the acute phase of pneumonia, where the alveoli fill with **exudate**, giving a liver-like appearance to the lung [1][3]. - It is characterized by **reddish-brown** consolidation, not the output of the terminal stage [3]. *Gray hepatization* - This phase follows red hepatization and involves the breakdown of red cells, presenting a grayish appearance, indicating ongoing inflammation [1][3]. - It does not signify resolution; patients are still in the acute infectious stage during this phase [3]. **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. (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. 193-194. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Respiratory Tract Disease, pp. 317-318.

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 is a primary pleural tumor?

Mesothelioma. ***Mesothelioma*** - Mesothelioma is a **primary malignant tumor** of the pleura [1], commonly associated with **asbestos exposure** [2]. - It typically presents with symptoms like **pleuritic chest pain**, dyspnea, and pleural effusion. *Myxoma* - Myxoma is a **benign tumor** primarily found in the **heart**, particularly in the left atrium, not in the pleura. - It does not arise from pleural tissue and lacks the **malignant characteristics** of mesothelioma. *All* - This option suggests that multiple tumors can be primary pleural tumors, which is incorrect as only mesothelioma is recognized as such. - Other tumors like myxoma and lipoma do not originate in the pleura and thus cannot be classified as primary pleural tumors. *Lipoma* - Lipoma is a **benign tumor** made up of adipose tissue [3] and is typically found in *subcutaneous tissue*, not the pleural cavity. - It does not have the malignant potential or association with pleural disease that characterizes mesothelioma. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, pp. 728-729. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Respiratory Tract Disease, pp. 339-340. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Bones, Joints, and Soft Tissue Tumors, p. 1222.

Q: Which of the following is not an obstructive lung disease?

Interstitial fibrosis. ***Interstitial fibrosis*** - **Interstitial fibrosis** is a **restrictive lung disease**, characterized by **reduced lung elasticity** and lung volumes, rather than airway obstruction [1]. - In this condition, the **lung tissue becomes scarred and stiff**, making it difficult to expand fully during inspiration [1]. *Emphysema* - **Emphysema** is a classic **obstructive lung disease** caused by the destruction of the **alveolar walls**, leading to enlarged air spaces and loss of elastic recoil [3]. - This destruction results in **airflow limitation**, particularly during exhalation, as airways collapse prematurely. *Asthma* - **Asthma** is an **obstructive lung disease** characterized by **reversible airway inflammation**, bronchoconstriction, and increased mucus production [2]. - These factors lead to **episodic airflow obstruction**, making it difficult to breathe, especially during exacerbations [2]. *Bronchitis* - **Bronchitis**, particularly **chronic bronchitis**, is an **obstructive lung disease** defined by chronic inflammation of the bronchi. - This inflammation causes **mucus hypersecretion** and narrowing of the airways, leading to persistent cough and airflow limitation.

Q: What is the most common type of mediastinal tumor?

Thymoma. ***Thymoma*** - **Thymoma** is the most common **primary tumor** of the mediastinum in **adults**, particularly in the **anterior mediastinum** [1]. - It typically occurs in adults aged **40-60 years** and is often associated with **paraneoplastic syndromes** such as **myasthenia gravis** (30-50% of cases), pure red cell aplasia, and hypogammaglobulinemia [1]. - Presents as an **anterior mediastinal mass** on chest imaging, often detected incidentally or due to mass effect symptoms [1]. *Lymphoma* - **Lymphoma** (both Hodgkin and non-Hodgkin) is a common cause of mediastinal masses, especially in **younger patients** and adolescents [1]. - However, mediastinal lymphoma often represents **secondary involvement** or systemic disease rather than a primary mediastinal tumor. - In pediatric populations, lymphomas are among the most common mediastinal masses. *Neurogenic tumor* - **Neurogenic tumors** (schwannomas, neurofibromas, ganglioneuromas) are the most common tumors of the **posterior mediastinum** across all age groups. - They arise from **nerve sheaths** or **sympathetic ganglia** and are the most common mediastinal tumor in **children**. - In the posterior compartment specifically, they predominate, but overall thymoma is more common in adults. *Teratoma* - **Teratomas** are **germ cell tumors** containing tissues from all three germ layers (ectoderm, mesoderm, endoderm), which may include hair, teeth, cartilage, and bone [1]. - They are the most common germ cell tumor of the mediastinum and typically occur in the **anterior mediastinum** [1]. - More common in younger patients but less frequent overall than thymomas in the adult population. **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. 571-574.

Q: What occurs during the stage of Grey hepatization?

Accumulation of fibrin. ***Accumulation of fibrin*** - Grey hepatization is characterized by the **presence of fibrinous exudate** in the alveoli, indicating significant lung pathology, usually in cases of pneumonia [1,2]. - This stage follows red hepatization and reflects the **progression of inflammation** within the lung tissue [1,2]. *RBC's fill the alveoli* - This occurs during the **red hepatization** stage, where RBCs invade alveoli, not grey hepatization [1,2]. - **Grey hepatization** is marked by **fibrinous deposits** instead of erythrocytes [1,2]. *Organisms fill the alveoli* - While organisms, such as bacteria, can be present, they are more characteristic of the **initial infection phase** rather than grey hepatization [1]. - This stage reflects more on the **inflammatory response** than the presence of pathogens. *WBC's fill the alveoli* - The infiltration of **WBCs (like neutrophils)** represents an earlier inflammatory process, usually preceding grey hepatization [1,2]. - In grey hepatization, the focus is on the **accumulation of fibrin**, not directly on WBC infiltration [1,2]. **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: What is the term for the collapse of a lung?

Atelectasis. ***Atelectasis*** - **Atelectasis** is the technical term for the **collapse of a lung** or a part of a lung, leading to reduced or absent gas exchange. - It can be caused by **obstruction of the airway** (e.g., mucus plug, foreign body) or external compression on the lung [1]. *Emphysema* - **Emphysema** is a chronic lung disease characterized by the **destruction of the alveoli**, leading to permanent enlargement of airspaces [2]. - It results in reduced elastic recoil of the lungs and is a type of **COPD (chronic obstructive pulmonary disease)** [2]. *Bronchiectasis* - **Bronchiectasis** is a chronic condition where the airways (bronchi) become **abnormally widened** and scarred. - This widening leads to a buildup of mucus, making the lungs vulnerable to **recurrent infections**. *Bronchitis* - **Bronchitis** is an inflammation of the lining of the bronchial tubes, which carry air to and from your lungs. - It typically causes a **cough** with mucus production and can be acute or chronic.

Q: Creola bodies are seen in:

Bronchial asthma. ***Bronchial asthma*** - **Creola bodies** are clusters of **desquamated columnar epithelial cells** found in the sputum of patients with asthma. [1] - Their presence indicates ongoing **bronchial inflammation** and epithelial damage, characteristic of asthma exacerbations. *Chronic bronchitis* - Characterized by **mucus hypersecretion** and **chronic productive cough**, without the specific finding of Creola bodies. - Histologically, it involves **goblet cell hyperplasia** and **mucous gland enlargement**. *Emphysema* - Defined by irreversible enlargement of airspaces distal to the terminal bronchioles with **destruction of alveolar walls**, not specific cell aggregates. [1] - The primary defect is loss of **elastic recoil** and **airflow limitation**. *Bronchiectasis* - Involves **permanent abnormal dilation** of the bronchi due to destruction of the muscular and elastic components of the bronchial wall. [1] - Sputum typically contains inflammatory cells and bacteria, but Creola bodies are not a defining feature.

Q: Which of the following conditions can lead to pulmonary infarction?

Blockage of 2nd and 3rd generation end arteries. ***Blockage of 2nd and 3rd generation end arteries*** - These are **true end arteries** beyond the reach of **bronchial collateral circulation**, making pulmonary infarction more likely when blocked. - The **dual blood supply** (pulmonary and bronchial arteries) is compromised at this level, leading to tissue necrosis and infarction. *Saddle embolus at bifurcation* - A **saddle embolus** typically causes **sudden death** or **acute cor pulmonale** rather than pulmonary infarction. - The **main pulmonary artery bifurcation** is proximal enough that **bronchial collateral circulation** can still maintain tissue viability. *Arterioles being blocked* - **Arterioles** are small vessels that can be compensated by the **dual blood supply** from both pulmonary and bronchial circulations. - The **bronchial artery collaterals** can provide adequate perfusion to prevent infarction at this level. *None of the above* - This option is incorrect as **blockage of 2nd and 3rd generation end arteries** does cause pulmonary infarction. - The lung's **dual circulation** protects against infarction except when **true end arteries** are involved.

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

What is the final stage of pneumonia characterized by the resolution of lung inflammation?

Accepted Answer

Resolution

Answer

Congestion (early stage)

Answer

Red hepatization (middle stage)

Answer

Gray hepatization (late stage)

Question 3

Curschmann's spirals are seen in which condition?

Accepted Answer

Bronchial asthma

Answer

Bronchiectasis

Answer

Chronic bronchitis

Answer

Wegener's granulomatosis

Question 4

Which of the following is a primary pleural tumor?

Accepted Answer

Mesothelioma

Answer

Myxoma

Answer

Lipoma

Answer

None of the options

Question 5

Which of the following is not an obstructive lung disease?

Accepted Answer

Interstitial fibrosis

Answer

Emphysema

Answer

Asthma

Answer

Bronchitis

Question 6

What is the most common type of mediastinal tumor?

Accepted Answer

Thymoma

Answer

Lymphoma

Answer

Teratoma

Answer

Neurogenic tumor

Question 7

What occurs during the stage of Grey hepatization?

Accepted Answer

Accumulation of fibrin

Answer

Red blood cells fill the alveoli

Answer

White blood cells fill the alveoli

Answer

Bacteria fill the alveoli

Question 8

What is the term for the collapse of a lung?

Accepted Answer

Atelectasis

Answer

Emphysema

Answer

Bronchitis

Answer

Bronchiectasis

Question 9

Creola bodies are seen in:

Accepted Answer

Bronchial asthma

Answer

Emphysema

Answer

Chronic bronchitis

Answer

Bronchiectasis

Question 10

Which of the following conditions can lead to pulmonary infarction?

Accepted Answer

Blockage of 2nd and 3rd generation end arteries

Answer

Saddle embolus at bifurcation

Answer

Arterioles being blocked

Answer

None of the above.

Respiratory Pathology — MCQs

Respiratory Pathology — MCQs

On this page

Practice by Chapter

Want unlimited practice?