Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been interval recurrence of a previously drained moderate right pleural effusion , elevating the right lung base and causing some atelectasis at the right lung base . No pneumothorax is seen . The heart is mildly enlarged , unchanged compared to prior study . Focal opacity overlying the fourth through sixth ribs of the left lateral chest likely represents osteochondroma or post traumatic osseous lesion .
    OUTPUT:
    
Interval recurrence of a previously drained moderate right pleural effusion . Stable mild cardiomegaly . Focal opacity overlying the left lateral chest likely represent osteochondroma or posttraumatic rib coalition .