Histologic examination of lung tissue reveals multiple suppurative, neutrophil-rich exudates that fill the bronchi and bronchioles and spill over into the adjacent alveolar spaces only. The majority of lung tissue is not involved in this inflammatory process. Hyaline membranes are not found. This histologic appearance best describes
**Core Concept**
The histologic examination of lung tissue reveals specific patterns of inflammation that help differentiate between various types of lung diseases. In this case, the presence of suppurative, neutrophil-rich exudates in the bronchi and bronchioles with spillover into adjacent alveolar spaces suggests a specific type of pneumonia.
**Why the Correct Answer is Right**
Bronchopneumonia, also known as multifocal or patchy pneumonia, is characterized by the presence of multiple, discrete areas of consolidation in the lung that are often associated with suppurative, neutrophil-rich exudates. This pattern of inflammation is typically seen in response to bacterial infections, such as Streptococcus pneumoniae or Haemophilus influenzae. The fact that the majority of lung tissue is not involved in this inflammatory process and that hyaline membranes are not found is consistent with bronchopneumonia. The inflammatory exudates in bronchopneumonia tend to fill the bronchi and bronchioles, which is a key feature of this condition.
**Why Each Wrong Option is Incorrect**
**Option A:** Bronchiectasis is a chronic condition characterized by irreversible dilation of the bronchi, often associated with chronic infection and inflammation. It does not typically present with acute suppurative exudates in the bronchi and bronchioles.
**Option C:** Lobar pneumonia is typically characterized by the involvement of a single lobe of the lung, often with a uniform pattern of consolidation and the presence of hyaline membranes. This is in contrast to the multifocal, patchy pattern seen in bronchopneumonia.
**Option D:** Interstitial pneumonitis is characterized by inflammation of the interstitial tissue of the lung, often associated with conditions such as sarcoidosis or idiopathic pulmonary fibrosis. It typically presents with a different histologic pattern than bronchopneumonia.
**Clinical Pearl / High-Yield Fact**
It's worth noting that bronchopneumonia can often be seen in patients with underlying chronic lung disease, such as chronic obstructive pulmonary disease (COPD) or bronchiectasis. This is because the underlying lung disease can provide a fertile ground for bacterial colonization and subsequent infection.
**✓ Correct Answer: B. Bronchopneumonia**