Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded and clear . Cardiomediastinal and hilar contours are unremarkable . There is no pleural effusion or pneumothorax . Of note , in the lateral view there is a 2 .5 x 2 .7 cm round opacity projecting over the posterior aspect of two mid thoracic vertebrae which appears unchanged from prior exams . However , certain location can not be determined as it might be related to vertebral bodies or to the soft tissue .
    OUTPUT:
    
No evidence of acute cardiopulmonary process . A round opacity projecting over the posterior aspect of two mid thoracic vertebrae appears unchanged since ___ but location can not be accurately assessed . Recommend further evaluation with chest CT .