Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrate normal cardiomediastinal and hilar contours . A left lower lung linear opacity likely represents atelectasis or fibrosis ; the lungs are otherwise clear without pulmonary edema or focal consolidation . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Unchanged chest radiograph without radiographic evidence of sarcoidosis .