Pneumoperitoneum

The presence of air in the pericardial cavity. Causes include chest injury in adults, and respiratory distress syndrome in infants.

Inflammation of the lungs. This may be caused by disease, infection, radiation therapy, allergy, or irritation of lung tissue by inhaled…

A severe inflammation of the lungs in which the alveoli (tiny air sacs) are filled with fluid. This may cause a decrease…

Surgery to remove all of one lung. In a partial pneumonectomy, one or more lobes of a lung are removed.

The presence of air in the mediastinum. It is caused by injury, most often esophageal or intestinal perforation.

Pneumonia resulting from infection with Pneumocystis carinii, frequently seen in the immunologically compromised, such as persons with AIDS, or steroid-treated individuals, the…