Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable view of the chest . There is slightly increased interstitial marking seen throughout the lungs , the chronicity of which is uncertain given lack of prior . There is a more focal region of opacity projecting over the left mid lung . It s etiology is uncertain and it could be due to confluence of shadows including the scapula . The cardiomediastinal silhouette is within normal limits . Atherosclerotic calcifications seen in the aorta .
    OUTPUT:
    
Increased interstitial markings throughout the lungs are of uncertain chronicity , potentially chronic due to chronic underlying process or mild interstitial edema . More focal region of opacity in the left mid lung could be due to confluence of shadows , although lung opacity is also possible . Consider PA and lateral to better characterize these findings , especially given this somewhat limited exam due to rotation and portable technique .