Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were obtained . A nodule located in the left lower lobe measures 7 mm ; otherwise , the lungs are clear . The heart size is normal and there is no evidence of vascular congestion , pleural effusion , or pneumothorax . No concerning osseous or soft tissue lesions .
    OUTPUT:
    
Left lower lobe ground - glass nodule measuring 7 mm could represent a granuloma . Obtaining prior chest radiographs for confirmation of stability is recommended ; however , if no prior studies are available , CT is recommended for better characterization .