A 62-year-old man with chronic obstructive pulmonary disease (COPD) and recent aspiration presents with fever, cough, and purulent sputum. Chest X-ray shows patchy infiltrates predominantly in the lower lobes around the hilum. All of the following are true regarding bronchopneumonia in this patient EXCEPT:

Explanation

## Bronchopneumonia: Pathological Characteristics and Clinical Context **Key Point:** Bronchopneumonia is a patchy, peribronchial infection that lacks the classic staged progression seen in lobar pneumonia. It is the most common form of pneumonia in hospitalized and immunocompromised patients. ### Clinical Presentation and Risk Factors **High-Yield:** Bronchopneumonia is strongly associated with: - Aspiration (as in this case) - COPD and chronic lung disease - Immunosuppression - Mechanical ventilation - Advanced age - Altered consciousness The patient's COPD and aspiration history make bronchopneumonia the expected diagnosis. ### Pathological Features: Bronchopneumonia vs Lobar Pneumonia | Feature | Bronchopneumonia | Lobar Pneumonia | |---------|-------------------|------------------| | **Anatomical distribution** | Patchy; peribronchial and peribronchiolar | Entire lobes; segmental | | **Airway involvement** | Bronchi occluded by purulent exudate | Bronchi patent | | **Pathological stages** | NO classic stages; suppuration → abscess | Red → Gray → Resolution (4 stages) | | **Exudate character** | Purulent (neutrophil-rich) | Fibrinous (fibrin-rich) | | **Pleural involvement** | Uncommon | Fibrinous pleuritis common | | **Common organisms** | *Staph aureus*, *H. influenzae*, gram-negatives | *Streptococcus pneumoniae* | | **X-ray pattern** | Patchy, ill-defined opacities around hilum | Dense, homogeneous consolidation | **Clinical Pearl:** The patchy, peribronchial distribution on chest X-ray (as described in this case) is the radiological hallmark of bronchopneumonia. The infiltrates cluster around the hilum and lower lobes because gravity and aspiration favor these regions. ### Why Option 3 is Incorrect Option 3 states: "Pathologically, the process progresses through well-defined stages of red hepatization followed by gray hepatization." This is **FALSE for bronchopneumonia**. The classic four-stage progression (red hepatization → gray hepatization → resolution) is **pathognomonic for lobar pneumonia**, not bronchopneumonia. **Bronchopneumonia does NOT have these stages.** Instead, it is characterized by: 1. **Acute suppuration** around bronchioles 2. **Abscess formation** (microabscesses) 3. **Fibrinous exudate** with neutrophilic infiltration 4. **Resolution** (if treated) or **organization** (if chronic) There is no orderly progression through hepatization stages in bronchopneumonia. **Mnemonic:** **LOBAR = HEPATIZATION; BRONCHO = SUPPURATION** - **Lobar** → **L**iver-like (hepatization) stages - **Broncho** → **B**ronchi blocked, **B**acterial suppuration (no hepatization) ### Why the Other Options are Correct **Option 1:** Correct. Bronchopneumonia is defined by peribronchial distribution with bronchial occlusion by purulent material. **Option 2:** Correct. These are the classic causative organisms in bronchopneumonia, especially in aspiration and COPD contexts. **Option 4:** Correct. COPD, aspiration, and immunosuppression are major predisposing factors for bronchopneumonia. [cite:Robbins 10e Ch 15]