Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with the most recent prior study , lung volumes are improved and a moderate to large left pleural effusion is likely unchanged . There is mild associated bibasilar dependent atelectasis . Moderate cardiomegaly , numerous mediastinal clips , and a prosthetic valve are unchanged . The descending aorta is partially calcified and tortuous . An IVC filter is partially imaged . There is no focal consolidation , pulmonary edema , or pneumothorax . Mild biapical pleural thickening is similar . Probable splenomegaly is noted .
    OUTPUT:
    
Improved lung volumes with a probably unchanged moderate to large left pleural effusion .