Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiographs are obtained with patient in the upright position . Heart is mildly enlarged but stable . Cardiomediastinal contours are unremarkable . The known opacity projecting over the left upper lobe is stable . There is interval placement of a fiducial marker in the left upper lobe . Right lung is clear . No significant pleural effusions . No pneumothorax . IVC filter projects over the upper abdomen .
    OUTPUT:
    
Interval placement of a fiducial marker over the known mass in the left upper lobe . No pneumothorax .