Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The left upper lobe alveolar opacities are better today . They were compatible with contusion . Stability of the mild apical and axillary left pleural effusion . There is no visible pneumothorax . The left lower lobe atelectasis is still present ; however , there seems to be a slight left mediastinal shift since the previous exam , possibly because of the rotation of the patient , but a progression of the atelectasis can also be considered . The radiolucencies that were adjacent to the left cardiac border are better : they are possibly compatible with laceration . The right lung is normal . Stability of the undisplaced left scapular fracture .
    OUTPUT:
    
1 . Amelioration of the left lung contusions . The radiolucencies in the left lower lung that were described yesterday possibly compatible with lacerations are better today . 2 . No pneumothorax . The mild left pleural effusion is unchanged . 3 . Possible slight mediastinal shift on the left secondary to a progression of the left lower lobe atelectasis versus displacement only due to the position and rotation of the patient .