Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post median sternotomy and CABG . Mild cardiomegaly is re - demonstrated , unchanged . Aorta is diffusely calcified , and the mediastinal and hilar contours are similar . Mild pulmonary edema is minimally improved from the previous study with persistent small bilateral pleural effusions , larger on the left . Bibasilar patchy opacities likely reflect areas of atelectasis . Ovoid focal opacity within the left mid lung field appears to reflect fluid loculated posteriorly in the major fissure on the left on the lateral view .
    OUTPUT:
    
Mild pulmonary edema , minimally improved from the previous study with small bilateral pleural effusions , larger on the left . Small amount of fluid is loculated within the left major fissure posteriorly . Bibasilar atelectasis .