Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A left - sided AICD / pacer device is noted with leads in unchanged positions . Heart size is mildly enlarged . The thoracic aorta is diffusely calcified . Mediastinal and hilar contours are unchanged . Pulmonary vasculature is not engorged . Subsegmental atelectasis is noted in both lung bases without focal consolidation . No pleural effusion or pneumothorax is seen . Moderate degenerative changes are noted in the thoracic spine . Partially imaged in the left proximal humeral diaphysis is a geographic sclerotic lesion , possibly an enchondroma or bone infarct , incompletely assessed . Deformity of the distal left clavicle is unchanged , compatible with prior fracture .
    OUTPUT:
    
Bibasilar subsegmental atelectasis . No definite focal consolidation . Partially imaged sclerotic lesion in the left proximal humeral diaphysis , possibly an enchondroma or bone infarct .