Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are low lung volumes . Myelomatous changes of multiple rib , lytic lesions in the proximal left humerus , compression deformity of at least 2 vertebral bodies in the mid thoracic spine , again seen in this patient with history of multiple myeloma . Scattered areas of linear atelectasis are seen . Retrocardiac opacity seen the lateral view may be due to atelectasis but pneumonia is not excluded in the appropriate clinical setting . The cardiac silhouette is top - normal to mildly enlarged . The aorta is tortuous .
    OUTPUT:
    
Retrocardiac opacity on the lateral view may be due to atelectasis , but pneumonia is not excluded in the appropriate clinical setting .