Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart is upper limits of normal in size . Mediastinal and hilar contours are normal . Lungs are remarkable for a focal area of increased opacity overlying the lower thoracic spine posteriorly on the lateral view , a finding that is new since older lateral chest x-ray of ___ and has a slightly wedge - shaped configuration . This is difficult to localize on the PA view but is possibly within the right retrocardiac region , which appears more dense than the left side . Lungs otherwise appear clear , and there are no pleural effusions or acute skeletal findings .
    OUTPUT:
    
Focal basilar lung opacity on lateral chest x-ray , difficult to definitively localize on the PA view , but possibly within the right lower lobe . Although the findings are nonspecific , in the setting of pleuritic chest pain , pulmonary embolism should be considered as well as a focal infectious pneumonia in the appropriate clinical setting . Findings were discussed by phone with Dr . ___ at 2 : 20 p .m . on ___ ( time of discovery 2 :05 pm on ___ ) .