Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The mediastinal and hilar contours appear within normal limits . The left posterior costophrenic sulcus is partly excluded making it difficult to exclude a pleural effusion . There is probably a trace pleural effusion , however , detectable on the left side . A small round hyperdense focus in the right mid lung is most consistent with a nipple shadow , or perhaps less likely a possibly calcified pulmonary nodule . Otherwise the lung fields appear clear .
    OUTPUT:
    
No evidence of acute cardiopulmonary disease . Probable nipple shadow on the right ; when clinically appropriate confirmation with an additional PA view including nipple markers is recommended .