Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear unchanged . There is new mild volume loss at the left lung base , with streaky opacification and a suspected very small pleural effusion . More generally , there is a diffuse mild interstitial abnormality , which is most prominent in the mid and lower lungs and could be seen with pulmonary vascular congestion . In the setting of suspected infection , however , the possibility of atypical pneumonia could be considered and more focal developing pneumonia is also a differential consideration for retrocardiac opacification at the left lung base versus atelectasis .
    OUTPUT:
    
1 . Mild interstitial abnormality for which fluid overload or atypical pneumonia could be considered . 2 . Focal left basilar opacity , possibly developing pneumonia , although atelectasis could explain the findings .