Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable upright chest radiograph ___ at 07 :34 is submitted .
    OUTPUT:
    
There is improved inspiration with increasing aeration at the left base but residual bibasilar atelectasis , less likely aspiration or pneumonia . The right hemidiaphragm remains elevated of uncertain etiology . Fractures involving the left ninth and tenth posterolateral ribs can now be visualized . There is a layering left effusion . No pneumothorax is seen . Overall cardiac and mediastinal contours are likely stable given patient rotation on the current study . Clips in the right upper quadrant are consistent with prior cholecystectomy . Severe degenerative change of the left glenohumeral joint which is incompletely visualized . Remote fracture of the right humeral head with remodeling and associated degenerative change .