Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A bedside AP radiograph of the chest demonstrates stable low lung volumes as well as marked bilateral lower lobe atelectasis . Although there are persistent findings consistent with hypervolemia , such as marked dilation of the azygos vein , the mild interstitial pulmonary edema seen on the prior radiograph has improved somewhat . Clearance of the edema has revealed heterogeneous opacities in the left upper lobe which may also be due to atelectasis , however , other causes such as underlying pneumonia can not be excluded . There is possibly a small effusion on the left , if any . There is no pneumothorax . Moderate cardiomegaly persists . An endotracheal tube terminates no less than 4 .5 cm above the carina . An orogastric tube terminates in the stomach .
    OUTPUT:
    
1 . Persistent mild hypervolemia with interval improvement in mild pulmonary edema . 2 . Marked bibasilar atelectasis and probable left upper lobe atelectasis , which should be evaluated with conventional PA and lateral radiographs as soon as feasible .