Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are low , limiting evaluation . On one of the lateral views , there is a small wedge - shaped opacity overlying the heart in the distribution of the right middle lobe . This could represent focal atelectasis , although a small right middle lobe pneumonia is difficult to completely exclude . The lungs are otherwise clear . There is no edema , pleural effusion , or pneumothorax . Previously seen small bilateral pleural effusions have essentially resolved in the interval . The mediastinal contours are normal . The heart is mildly enlarged , and allowing for technique , unchanged from prior exams . Degenerative changes are noted in the lower thoracic spine .
    OUTPUT:
    
1 . Small wedge - shaped opacity in the right middle lobe , on one view only , may represent focal atelectasis or pneumonia or artifact . 2 . Unchanged cardiomegaly .