A lung abscess, also known as pulmonary abscess, occurs when a pocket of lung tissue becomes necrotized. This happens when microorganisms like bacteria, fungi, or parasites invade and infect the lung tissue. As a result, the affected tissue dies and transforms into a mixture of dead matter, white blood cells, and pus.
Before the advent of antibiotics, lung abscesses were fatal in 75% of cases. However, with the availability of modern medical care, the recovery rate has significantly increased to over 90%. Despite the improved treatment options, lung infections remain a serious and potentially life-threatening condition.
Causes of Primary Lung Abscesses
Primary lung abscesses are responsible for the majority, approximately 60%, of all cases. The leading cause of primary lung abscesses is aspiration, which occurs when food particles are mistakenly breathed into the trachea instead of the esophagus. When this happens, bacteria present on the food particles enter the lungs. Unlike the stomach, the lungs lack the acidic environment that would normally kill these bacteria if they were ingested through the proper pathway.
Aside from aspiration, there are several other common causes of primary lung abscesses. These include sinus infections, infections in the teeth and gums, pneumonia, frequent vomiting, and acid reflux. In cases of acid reflux, stomach acid from the esophagus or mouth can enter the trachea and cause damage to the lung tissue.
Causes of Secondary Lung Abscesses
Secondary lung abscesses, as the name suggests, are a result of underlying conditions or issues. Various factors can contribute to the development of these abscesses. One common cause is the presence of obstructions in the bronchial tubes, which are the airways branching out from the trachea. Additionally, conditions such as chronic obstructive pulmonary disease (COPD), tuberculosis, emphysema, cystic fibrosis, and infections in the abdomen or other organs can also lead to secondary lung abscesses.
Lung injuries can also be a contributing factor. For example, contusions can occur when the lungs experience blunt force trauma, often seen in car accidents or serious falls. Furthermore, tumors and enlarged lymph nodes can cause lung abscesses when they obstruct or exert excessive pressure on the surrounding lung tissue.