QCM : Lung Pathology and Disease Mechanisms — 7 questions

Questions et réponses du QCM

1. How does granuloma formation differ from caseous necrosis in the pathophysiology of tuberculosis?

Granuloma formation results in tissue destruction and necrosis, while caseous necrosis is a benign, organized immune structure.
Granuloma formation occurs only in latent TB, while caseous necrosis is exclusive to active TB infection.
Both granuloma formation and caseous necrosis are uncontrolled tissue destructions caused directly by the bacteria, with no immune involvement.
Granuloma formation is an immune response involving organized immune cells, whereas caseous necrosis is a form of tissue death occurring within granulomas.

Granuloma formation is an immune response involving organized immune cells, whereas caseous necrosis is a form of tissue death occurring within granulomas.

Explication

Granuloma formation is an organized immune response involving macrophages, T-cells, and other immune cells attempting to contain Mycobacterium tuberculosis. Caseous necrosis, on the other hand, is a specific tissue death characterized by a cheese-like appearance, occurring within granulomas as a result of immune-mediated tissue destruction. They are distinct processes: one is a cellular immune structure, and the other is a form of necrosis within that structure.

2. What is a key characteristic feature of granulomas in tuberculosis?

Presence of caseous necrosis
Presence of hyaline cartilage
Accumulation of eosinophils
Formation of sinus tracts

Presence of caseous necrosis

Explication

Granulomas in TB often contain caseous necrosis, a cheese-like tissue death, which is characteristic of the immune response to Mycobacterium tuberculosis.

3. What does reactivation of tuberculosis specifically refer to?

A new infection with Mycobacterium tuberculosis in an individual previously exposed.
The spread of TB bacteria through the bloodstream to distant organs.
The process where dormant bacteria within granulomas become active again, leading to disease recurrence.
The immune system successfully eliminating the bacteria, leading to cure.

The process where dormant bacteria within granulomas become active again, leading to disease recurrence.

Explication

Reactivation of tuberculosis refers to the process where dormant bacteria, previously contained within granulomas, become active again, often due to immune suppression, causing renewed disease. Reinfection, by contrast, involves new bacterial infection. The other options describe different processes unrelated to reactivation.

4. How do alveolar macrophages react when they first encounter Mycobacterium tuberculosis?

They successfully destroy the bacteria
They phagocytose but cannot destroy the bacteria
They release antibodies
They differentiate into neutrophils

They phagocytose but cannot destroy the bacteria

Explication

Alveolar macrophages attempt to engulf the bacteria but are often unable to destroy Mycobacterium tuberculosis, leading to granuloma formation.

5. What is the primary immune mechanism responsible for containing TB infection in granulomas?

Antibody production by B-cells
Cell-mediated immunity involving T-cells
Complement activation
Eosinophilic response

Cell-mediated immunity involving T-cells

Explication

Cell-mediated immunity, particularly T-cell responses, is central to forming granulomas that contain TB infection.

6. Which of the following best describes reactivation of tuberculosis?

Reinfection with a new strain in a previously unexposed individual
Dormant granulomas becoming active due to immune suppression
A new infection in an immune-competent individual
Spread of bacteria through the bloodstream

Dormant granulomas becoming active due to immune suppression

Explication

Reactivation refers to dormant granulomas becoming active again, often due to immunosuppression, leading to renewed disease.

7. What role does caseous necrosis play in tuberculosis pathology?

It indicates the destruction of hyaline membrane
It is a hallmark of granulomatous inflammation, reflecting tissue death within granulomas
It signifies liquefactive necrosis typical of abscesses
It appears as fibrotic tissue replacing granulomas

It is a hallmark of granulomatous inflammation, reflecting tissue death within granulomas

Explication

Caseous necrosis is characteristic of TB granulomas, representing tissue death that contributes to the cheese-like appearance within the granuloma.

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Tuberculosis — immune response?

Granuloma formation with caseous necrosis

Granuloma formation — purpose?

Containment of Mycobacterium tuberculosis.

Reactivation vs Reinfection — difference?

Reactivation: dormant bacteria become active; Reinfection: new bacterial infection occurs

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