Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mediastinal contour is enlarged . Heart size is top - normal . There is no large pleural effusion . There is no pneumothorax . Lung volumes are low without focal consolidation . No displaced rib fracture is seen .
    OUTPUT:
    
Mediastinal contour enlargement , may be related to portable supine technique . No upper mediastinal hematoma seen on same - day cervical spine CT .