Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lungs are hypoinflated with crowding of vasculature . A vertical linear retrocardiac opacity is noted . Mild vascular congestion is present . There is moderate cardiomegaly likely accentuated due to low lung volumes and patient positioning . Mediastinal contour and hila are unremarkable . No pleural effusion or pneumothorax .
    OUTPUT:
    
1 . Mild vascular congestion . 2 . Vertical linear retrocardiac opacity is most consistent with atelectasis , however superimposed infection can not be excluded . 3 . Moderate cardiomegaly , accentuated due to low lung volumes and patient positioning .