Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright chest radiograph was provided . Overlying EKG leads are present . There is mediastinal widening which could reflect technique , though underlying mediastinal abnormality can not be excluded . Irregular nodularity in the right upper lobe appears grossly stable from ___ radiograph . There is increased reticular opacity in the lower lungs bilaterally which may in part represent atelectasis , though the possibility of fibrotic changes not excluded . There is no convincing sign of pneumonia or pulmonary edema . The heart size is normal . No free air below the right hemidiaphragm . Degenerative changes are again seen at the left glenohumeral joint .
    OUTPUT:
    
Mediastinal prominence likely in part attributable to technique , though the possibility of mediastinal pathology not excluded . Consider dedicated PA and lateral views to better assess . Reticular opacity in the right upper lung appears grossly stable from prior exam and likely represents a focus of scarring . No convincing signs of pneumonia or CHF .