Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are somewhat improved compared to the prior study . The trachea is central . The cardiomediastinal contour is unchanged . Heart size is at the upper limits of normal . Prominence of the bilateral hila and pulmonary vascular structures is less apparent than on the prior study . No frank pulmonary edema . No pleural effusion seen . Degenerative changes in the thoracic spine .
    OUTPUT:
    
Interval improvement in lung volumes likely resulting in less convincing evidence of congestive heart failure . No frank pulmonary edema seen .