Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single supine portable view of the chest . Low lung volumes seen on the current exam with secondary crowding of the bronchovascular markings . Linear right basilar opacity is most likely due to atelectasis . Blunting of the right costophrenic angle may also be due to atelectasis although underlying effusion is also possible . The cardiomediastinal silhouette is within normal limits for technique . Degenerative changes noted at the right shoulder as on prior .
    OUTPUT:
    
Probable right basilar atelectasis noting effusion is also possible . Otherwise unremarkable exam based on low lung volumes and supine technique .