Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The mediastinal and hilar contours are normal . The pulmonary vasculature is normal . Lungs are clear EXCEPT FOR A QUESTIONABLE SUBCENTIMETER NODULAR OPACITY IN THE PERIPHERY OF THE LEFT UPPER LUNG BETWEEN THE SECOND AND THIRD ANTERIOR RIBS , PARTIALLY OBSCURED BY THE OVERLYING SCAPULAR MARGIN . No pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
Questionable sub cm left upper lobe nodular opacity , most likely due to superimposition of normal structures . Repeat radiograph with repositioning of the scapula would be helpful to better evaluate this region , particularly considering clinical suspicion for septic emboli .