Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right IJ central line tip overlies proximal SVC . Mediastinal drain and left chest tube noted . No obvious pneumothorax . Possibility of a tiny left apical pneumothorax is difficult to X completely exclude . Cardiomediastinal silhouette is unchanged , with sternotomy wires noted . There is upper zone redistribution , without overt CHF . Patchy retrocardiac opacity is similar to prior . Blunting of the left costophrenic angle is again noted . Subsegmental atelectasis the right cardiophrenic region is improved . A cerclage wire overlies the overlap point of the left clavicle and left scapular spine . At the edge of these films , there is increased density in the left proximal humerus likely representing chondroid calcification .
    OUTPUT:
    
No obvious pneumothorax , though a tiny left apical pneumothorax would be difficult to exclude . Cardiomediastinal silhouette unchanged . Upper zone redistribution , without overt CHF again noted . Left base opacity essentially unchanged . Slight interval improvement in cardiophrenic angle atelectasis . Chondroid calcifications noted in the visualized portion of the left proximal humerus , though the lesion extends beyond the edge of these films . Though not fully evaluated , the appearance is suggestive of a chondroid lesion such as an enchondroma . Recommend further assessment with dedicated left humerus radiographs , though this can be pursued when the patient is stable .