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Air or gas in middle ear. Air is present in the tympanic cavity.  

Air or gas and serum in chest cavity.  

Air or gas in spinal canal.  

Air or gas and pus in chest cavity. The presence of air and pus within the chest cavity, particularly in the pleural space.  

Air or gas and pus in sac containing the heart. The presence of both gas and pus within the pericardium.  

Air or gas behind lower part of bladder.  

Air or gas in front of the heart.  

Air or gas in abdominal cavity. Air in the peritoneal cavity. Air or gas in the peritoneal or abdominal cavity, usually due to a perforation of the stomach or bowel. A former treatment of tuberculosis was the deliberate injection of air into the peritoneal cavity to allow the tuberculous lung to be rested {artificial pneumoperitoneum).…

Air or gas in sac containing the heart. Accumulation of air between the two layers of pericardium; it is most often caused by penetrating trauma (e.g., gunshot or knife wound) and may require pericardiocentesis to dram the air. Air or gas in the pericardial sac; caused by trauma or pathological communication between the esophagus, stomach,…

Air or gas in space between lungs. The presence of air or gas in the mediastinal tissues, either owing to disease or following injection of air into the area. It is a cause of intense chest pain that worsens with movement.