Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal with mild unfolding of the thoracic aorta . Mediastinal silhouette and hilar contours are unremarkable . An indistinct 2 .3 cm nodular opacity is identified in the right lung apex overlying the posterior fifth rib . A left main bronchus stent is identified and is in appropriate position and appears patent . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
1 . Appropriate positioning of left main bronchus stent which appears patent . 2 . 2 .3 cm nodular opacity projecting over the posterior fifth rib on the right likely representing a metastatic lesion in this patient with known pulmonary metastases .