Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is top normal . Mediastinal and hilar contours are normal . There is no pulmonary vascular congestion , pulmonary edema or pleural effusion . The lungs are well expanded and clear . There is excess soft tissue in the retrosternal airspace at the level of manubrium appreciated on the lateral view . No pneumothorax .
    OUTPUT:
    
1 . Small increase in retrosternal soft tissue density at the level of manubrium which is not large enough to signify a mass . However , if the symptoms persist , CT chest should be obtained to better investigate this finding . Stat read was called to ___ , RN by Dr . ___ ___ telephone at 2 :47 p .m . , 10 minutes after the time of discovery .