CT of the thorax, plain and post contrast – 

Moderate bilateral, non-compartimentalized pleural effusion is noted in the gravity dependent portions of the pleural cavities. The lung parenchyma and the bronchial tree present no abnormalities except for peripheral atelectasis.  The pulmonary vasculature is within normal limits. There is no evidence of lung lobe torsion. The mediastinum and mediastinal lymph nodes are within normal limits. The heart is within normal limits, there is no specific cardiac chamber or major vessel enlargement and no evidence of congestive heart failure. There is no pericardial effusion.