Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A frontal upright view of the chest was obtained portably . Since ___ , miild interstitial edema persists , but has improved . There is no focal consolidation , pleural effusion , or pneumothorax . Heart size is stable . Aortic tortuosity is unchanged . The left humeral head appears inferiorly subluxed with respect to the glenoid however is not visualized adequately on this film and may partially be positional .
    OUTPUT:
    
No pneumonia . Improved but persistent mild interstitial edema . Possible subluxation / dislocation of left glenohumeral joint for which dedicated shoulder films can futher characterize .