Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: This exam is suboptimal due to underpenetration from patient 's body habitus . Endotracheal tube terminates 4 .9 cm above the carina . Large cardiomediastinal silhouette is again seen . Lung volumes remain low . Vascular structures are dilated consistent with volume overload . Evaluation of increased densities of the lung bases bilaterally is particularly suboptimal and it is impossible to determine how much is due to atelectasis versus recent aspiration or pulmonary edema . Small pleural effusions are present at best . No large pneumothorax .
    OUTPUT:
    
1 . ET tube is in adequate position , 4 .9 cm above the carina . 2 . Limited evaluation of increased densities at lung bases , difficult to determine how much is related to atelectasis , recent aspiration or pulmonary edema .