Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA lateral views of the chest were provided . The lungs are clear without focal consolidation , effusion or pneumothorax . Patient is known to have a prominent fat pad abutting the left heart border likely accounting for subtle opacity seen at this level . No large effusion or pneumothorax . Heart size is normal . Mediastinal contour is unremarkable . Bony structures appear grossly intact .
    OUTPUT:
    
No acute intrathoracic process . Left medial lung base opacity likely represents prominent epicardial fat pad .