Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with prior radiograph , lung volumes are slightly lower which may account for bronchovascular crowdin . However these technical differences are not felt to completely justify the significant interval increase in widening of the vascular pedicle as well as interval increase in cardiac size . There are no focal opacities but the interstitial markings are more prominent than in the previous exam . There may be a small left - sided pleural effusion . No pneumothorax is identified .
    OUTPUT:
    
1 . Widening of the vascular pedicle compared with the prior exam , while could be related to technical differences and different lung volumes , underlying aortic aneurysm is not excluded and which should be further assessed with chest CT . 2 . Interstitial pulmonary edema on the setting of newly developed cardiomegaly .