Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable supine frontal chest radiograph demonstrates low lung volumes . Streaky right basilar airspace opacities are relatively unchanged compared to the prior examination and likely represent vascular crowding and atelectasis ; however , an underlying consolidation can not be entirely excluded . Prominent vascular markings in the upper lungs suggest mild pulmonary edema , unchanged . Cardiomediastinal contours are unremarkable . Calcifications are again noted in the aortic arch . Endotracheal tube terminates approximately 4 cm above the carina . Presumed NG tube courses along the midline passing the diaphragm , tip is not included on the image . There is no pleural effusion and no pneumothorax .
    OUTPUT:
    
1 . Unchanged appearance of bibasilar streaky opacification likely due to low lung volumes and atelectasis ; however , an underlying consolidation can not be excluded . 2 . Proper positioning of the endotracheal tube .