An 82-year-old bed-bound woman with advanced dementia and recurrent silent aspiration presents with high fever, productive cough with purulent sputum, and dyspnea. Chest X-ray shows bilateral patchy opacities at both lung bases. At autopsy, the cut lung surface reveals the appearance shown in the diagram. The areas marked **A** represent patchy multifocal consolidation centred on airways. Which of the following BEST describes the pathological process responsible for the pattern of consolidation seen in **A**?
A. Acute suppurative inflammation beginning in bronchioles and spreading into adjacent alveoli, producing patchy lobular consolidation with intervening aerated lung
B. Diffuse alveolar damage with hyaline membrane formation affecting the entire lung parenchyma uniformly
C. Uniform consolidation of an entire lobe with classical progression through congestion, red hepatization, grey hepatization, and resolution stages
D. Interstitial inflammation with lymphocytic infiltration and granuloma formation centred on the pulmonary interstitium
Explanation
Why Option 1 is right
The clinical and pathological presentation described—patchy multifocal consolidation centred on airways in a debilitated, aspiration-prone patient—is the hallmark of bronchopneumonia. Bronchopneumonia is defined as a suppurative inflammation that begins as acute bronchitis/bronchiolitis and spreads into surrounding alveoli, producing patchy lobular consolidation with relative preservation of intervening aerated lung. This is the exact pathological process responsible for the appearance marked A in the diagram. The organisms involved (Staphylococcus aureus, Klebsiella, Pseudomonas, Haemophilus) are typical of aspiration and hospital-acquired pneumonia in this clinical context. (Robbins Pathology; Harrison Pulmonary)
Why each distractor is wrong
Option 2: This describes lobar pneumonia, which presents with uniform consolidation of an entire lobe and the classical four-stage progression (congestion → red hepatization → grey hepatization → resolution). Lobar pneumonia is typically caused by Streptococcus pneumoniae in previously healthy adults and does NOT produce the patchy, multifocal pattern centred on airways seen in A.
Option 3: Diffuse alveolar damage with hyaline membrane formation is the pathological hallmark of ARDS and acute interstitial pneumonia, not bronchopneumonia. This would present as diffuse, uniform involvement rather than patchy foci centred on airways.
Option 4: Interstitial inflammation with granuloma formation describes chronic infections (e.g., tuberculosis) or hypersensitivity pneumonitis, not the acute suppurative process of bronchopneumonia.
High-YieldNEET PG
Bronchopneumonia = patchy, multifocal, airway-centred consolidation in the very young, very old, or chronically ill; lobar pneumonia = uniform lobar consolidation in previously healthy adults with Streptococcus pneumoniae.
Robbins Pathology; Harrison Pulmonary
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