Lobar Pneumonia

Lobar pneumonia is an infection that affects one or more large sections of the lungs called lobes. It primarily involves the lung tissue and causes it to become inflamed and filled with fluid or pus. This condition can make it difficult to breathe and often leads to symptoms like cough, fever, and chest pain. The infection is usually caused by bacteria, most commonly Streptococcus pneumoniae. Because the lungs are essential for oxygen exchange, lobar pneumonia can significantly impact overall health by reducing oxygen delivery to the body. It is important to recognize the symptoms early to diagnose and manage the infection properly.

Lobar pneumonia is an acute bacterial infection characterized by consolidation of an entire lobe of the lung due to alveolar exudate. The core pathology involves inflammation and filling of alveolar spaces with neutrophils, fibrin, and bacteria, leading to impaired gas exchange. The most common causative organism is Streptococcus pneumoniae, which triggers a robust immune response. Clinically, it presents with sudden onset of high fever, productive cough with rusty sputum, pleuritic chest pain, and dyspnea. The disease progresses through distinct histopathological stages: congestion, red hepatization, gray hepatization, and resolution. Recognition of these features is critical for diagnosis and treatment, as untreated lobar pneumonia can lead to complications such as abscess formation or pleural effusion.