Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: EXAM IS LIMITED BY MARKED PATIENT ROTATION . CARDIOMEDIASTINAL CONTOURS ARE GROSSLY NORMAL CONSIDERING THIS FACTOR . LUNGS ARE CLEAR EXCEPT FOR A QUESTIONABLE PATCHY OPACITY AT THE LEFT LUNG BASE .
    OUTPUT:
    
Limited examination due to rotation . Repeat radiograph with standard positioning is suggested when the patient 's condition permits in order to confirm or exclude an abnormality at the left lung base .