Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lead of a right chest wall generator terminate in stable position . Mild cardiomegaly and upper mediastinal contours are stable . Medial left lower lobe opacity has slightly improved compared to the prior exam . No substantial pleural effusion or pneumothorax .
    OUTPUT:
    
Medial left lower lobe opacity has slightly improved since the prior exam , however this was also present in ___ and an underlying lesion is not excluded . Dedicated non-emergent chest CT is recommended .