As long as the chest cavity is found to have fluid manifestation, are not a normal condition, the normal population in the process of CT examination, can not be found in the chest cavity fluid density. Normal people will have a small amount of fluid in the thoracic cavity to play a lubricating role, the general content of about 5 milliliters, through the CT examination can not be shown; once found in the thoracic cavity fluid, no matter how much the specific amount of abnormal phenomenon, need to be combined with the lung condition and clinical symptoms for comprehensive judgment, under the guidance of the clinician to carry out standardized treatment. If you find that there is a fluid density shadow in the chest cavity and it continues to increase, accompanied by obvious symptoms such as chest tightness and shortness of breath, you need to consult a doctor in time for observation, and after diagnosing the cause of the disease, carry out standardized treatment under the guidance of the clinician, so as to avoid delays in the condition.