Question:
Marbled appearance of lung paranchyma separated by thick yellowish interlobular septa is observed in:
Marbled appearance of lung paranchyma separated by thick yellowish interlobular septa is observed in:
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"Marbled lung" is a key diagnostic buzzword for CBPP. Always associate Mycoplasma mycoides with extensive serofibrinous pleural exudation and wide, fluid-distended interlobular septa.
Updated On: Aug 13, 2026
- Haemorrhagic septicemia
- Contagious Bovine Pleuropneumonia
- Tuberculosis
- Rhinosporidiosis
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
Severe pulmonary infections in cattle can lead to accumulation of inflammatory exudates in the interstitial tissues.
This causes marked expansion of the interlobular septa.
When combined with varying stages of hepatization (consolidation) in the adjacent alveolar parenchyma, this produces a distinctive "marbled" appearance on the cut surface of the lung.
Step 2: Detailed Explanation:
Let us examine the pathological features of the given diseases:
1. Contagious Bovine Pleuropneumonia (CBPP):
CBPP is a highly contagious disease of cattle caused by Mycoplasma mycoides subsp. mycoides (SC).
The pathology is classically characterized by severe, unilateral fibrinous pleuropneumonia.
The cut surface of the affected lung reveals:
- Marked expansion of the interlobular septa due to accumulation of yellow, fibrinous, and serous fluid (edema).
- Diverse stages of alveolar consolidation in adjacent lobules (grey hepatization, red hepatization, and normal congestion), which display various shades of red, pink, and grey.
The combination of thick, yellowish interlobular septa framing these multicolored lobules produces a striking, diagnostic "marbled" appearance.
Therefore, this option is correct.
2. Haemorrhagic Septicemia (caused by Pasteurella multocida):
This acute disease causes fibrinous pleuropneumonia with some septal edema, but it typically progresses too rapidly to produce the classic, chronic marbled pattern seen in CBPP.
3. Tuberculosis:
This chronic infection is characterized by caseous granulomas (tubercles) containing mineralized centers, rather than diffuse marbled consolidations.
4. Rhinosporidiosis:
This is a chronic fungal-like disease affecting the nasal cavity, characterized by polypoid growths, and does not infect the deep lung parenchyma.
Step 3: Final Answer:
The classic "marbled" lung with thick, yellowish interlobular septa is the pathognomonic lesion of Contagious Bovine Pleuropneumonia.
Therefore, the correct answer is option (B).
Severe pulmonary infections in cattle can lead to accumulation of inflammatory exudates in the interstitial tissues.
This causes marked expansion of the interlobular septa.
When combined with varying stages of hepatization (consolidation) in the adjacent alveolar parenchyma, this produces a distinctive "marbled" appearance on the cut surface of the lung.
Step 2: Detailed Explanation:
Let us examine the pathological features of the given diseases:
1. Contagious Bovine Pleuropneumonia (CBPP):
CBPP is a highly contagious disease of cattle caused by Mycoplasma mycoides subsp. mycoides (SC).
The pathology is classically characterized by severe, unilateral fibrinous pleuropneumonia.
The cut surface of the affected lung reveals:
- Marked expansion of the interlobular septa due to accumulation of yellow, fibrinous, and serous fluid (edema).
- Diverse stages of alveolar consolidation in adjacent lobules (grey hepatization, red hepatization, and normal congestion), which display various shades of red, pink, and grey.
The combination of thick, yellowish interlobular septa framing these multicolored lobules produces a striking, diagnostic "marbled" appearance.
Therefore, this option is correct.
2. Haemorrhagic Septicemia (caused by Pasteurella multocida):
This acute disease causes fibrinous pleuropneumonia with some septal edema, but it typically progresses too rapidly to produce the classic, chronic marbled pattern seen in CBPP.
3. Tuberculosis:
This chronic infection is characterized by caseous granulomas (tubercles) containing mineralized centers, rather than diffuse marbled consolidations.
4. Rhinosporidiosis:
This is a chronic fungal-like disease affecting the nasal cavity, characterized by polypoid growths, and does not infect the deep lung parenchyma.
Step 3: Final Answer:
The classic "marbled" lung with thick, yellowish interlobular septa is the pathognomonic lesion of Contagious Bovine Pleuropneumonia.
Therefore, the correct answer is option (B).
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