Sounds like he has pnemonia. Take him to a wildlife conservator or vet immediately.
It is called a chest pocket.
If there is brown fluid in the chest cavity, it could be blood or pus. This can become dangerous if there is an abundance of fluid.
A pneumothorax is a pocket of air in the chest cavity, and a hemothorax is a pocket of blood.
It is a "temproary patch" that should be worn over the right chest pocket (or hung from the button of the right chest pocket).
you tap on it
Pneumothorax is the result of an injury where air gets into the chest cavity. It can result from an open wound in the chest, such as by being stabbed, or it can occur from a closed wound such as broken ribs. Tension pneumothorax is the buildup of air in the chest cavity collapses the lung and puts pressure on the heart, which then can't pump blood effectively.
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movement of fluid in chest tube R/T inspiration & expiration
You can't make a pygmy beat his chest. You just have to sit around and wait until he does.
Intraplural fluid facilitates the movement of the lungs with every inhalation and exhalation in the chest cavity. It also protects the lungs from chest traumas.
CT scans of the chest are useful in distinguishing tumors and in detailing accumulation of fluid in chest infections.
Pleural fluid is contained between the parietal pleura and chest wall.