Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Allowing for differences in patient positioning and low lung volumes , mediastinal widening is unchanged . Heart size is top - normal . There are new opacities at the medial right lung base . Opacities at the left lung base have improved . Mild linear atelectasis at the left lung base is noted . An endotracheal tube terminates approximately 3 .5 cm superior to the carina . An enteric tube terminates in the gastric fundus .
    OUTPUT:
    
1 . Unchanged mediastinal widening consistent with known hematoma . 2 . New opacities at the right lung base may reflect atelectasis , aspiration , or developing pneumonia .