Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right lower lobe densities secondary to biopsy seen on prior exam has completely resolved . The lungs are now clear . Mediastinal and cardiac contour are now normal with less dense left hilum and resolution of enlargement of the azygos vein region . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Resolution of mediastinal or hilar involvement in this patient known with sarcoid .