Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right - sided PICC terminates in the low SVC . Heart is mildly enlarged , unchanged compared to prior study . Mediastinal silhouette is unchanged . Mild pulmonary vascular congestion has improved . There is no pulmonary edema or focal consolidation . No pneumothorax . Previously seen small left pleural effusion is appears to have improved however this may be positional . Mild rightward shift of the trachea is likely secondary to enlarged thyroid better evaluated on chest CT from ___ .
    OUTPUT:
    
1 . Improved pulmonary vascular congestion . 2 . Possible improvement in small left pleural effusion , however differences may be secondary to patient positioning .