Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs of the chest show a persistent ill - defined opacity in the right medial cardiophrenic recess which projects over the left atrium on the corresponding lateral radiograph . This opacity is not appreciably changed from ___ . The lungs are otherwise clear without focal consolidation , pleural effusion , or pneumothorax . The pulmonary vasculature is not engorged . The cardiac silhouette is normal in size . The mediastinal and hilar contours are stable and within normal limits . The thoracic aorta is unfolded with mild tortuosity of the descending thoracic aorta . Degenerative changes of the thoracic spine are noted with bridging osteophytes .
    OUTPUT:
    
Persistent ill - defined opacity at the right medial lung base . A followup CT is recommended for further evaluation , particularly in the setting of prior malignancy , to exclude metastasis .