Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are lower compared to the previous study . Heart size remains mildly enlarged . The aorta is tortuous , and the mediastinal and hilar contours appear similar . There is crowding of bronchovascular structures with mild pulmonary vascular engorgement , but no frank pulmonary edema . Patchy opacities in the lung bases may reflect areas of atelectasis . No pleural effusion or pneumothorax is identified . Extensive degenerative changes are noted involving left glenohumeral joint . Patient is status post right shoulder prosthesis .
    OUTPUT:
    
Decreased lung volumes with patchy opacities within the lung bases , possibly atelectasis , but infection is not excluded in the correct clinical setting . Unchanged mild cardiomegaly with mild pulmonary vascular congestion .