Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Evaluation is limited by patient positioning . Heart size and cardiomediastinal contours are normal . No focal consolidation or pneumothorax . Blunting of the left costophrenic angle has improved , now small , consistent with residual pleural effusion or thickening . Thoracic spine degenerative changes appear stable . Mild irregularity along a right mid thoracic lateral rib is nonspecific and may represent a fracture of indeterminate age .
    OUTPUT:
    
1 . Mild irregularity of a right mid thoracic lateral rib may represent a rib fracture of indeterminate age . Dedicated rib films could be obtained for further evaluation if warranted clinically . 2 . Interval improvement of now small left costophrenic angle blunting , either residual pleural effusion or thickening .