Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a left upper lobe 7 mm opacity . The remaining of the lungs are unremarkable . Mediastinal and cardiac contours are normal . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
1 . There is no evidence of pneumonia or atelectasis . 2 . 7 mm left upper lobe nodularity is of indeterminate localization and etiology . A standard PA and lateral chest radiography is suggested .