Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Previously seen left retrocardiac opacity has decreased in the interval , but is still clearly visible . Right PICC line ends at the distal SVC . There is mild cardiomegaly and mild vascular congestion . There is no large pleural effusion and no pneumothorax . Severe degenerative changes at the left glenohumeral joint are seen and spinal hardware in the lumbar spine .
    OUTPUT:
    
Interval decrease of a left retrocardiac opacity .