Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP and lateral views of the chest . Posterior fixation hardware in the thoracic spine is several years old . Elevation of the right lung base has been increasing slowly over the past ___ years . Small right pleural effusion is comparable to ___ , slightly larger than on ___ . Left subclavian line ends in the distal SVC . Heart size is normal . Cardiomediastinal and hilar contours are normal . Right basilar linear atelectasis is unchanged . No consolidation or pulmonary edema is present .
    OUTPUT:
    
No evidence of cardiac decompensation . Chronic unexplained elevation , right lung base and chronic , small to moderate right pleural effusion .