Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is mildly enlarged . The patient is rotated toward the left somewhat limiting assessment of the mediastinal contours . Hilar fullness is appreciated bilaterally . Additionally opacity in the retrocardiac region is present . There is no large pleural effusion or pneumothorax .
    OUTPUT:
    
Mild cardiomegaly and pulmonary vascular congestion consistent with early heart failure ; retrocardiac opacity may represent atelectasis , although in the appropriate clinical setting , pneumonia could not be excluded .