Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been post - thoracentesis improvement of a moderate right pleural effusion . No pneumothorax is seen . Extensive destruction of multiple right ribs is unchanged from prior examination and compatible with known history of metastatic prostate cancer . The heart size is normal . The hilar and mediastinal contours are within normal limits .
    OUTPUT:
    
1 ) Post - thoracentesis with improvement of a moderate right pleural effusion . No pneumothorax . 2 ) Destructive right rib metastases .