Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is increased soft tissue density within the superior mediastium and in the retrosternal space on the lateral projection with partial loss of the paratrachial stripe that is concerning for mass . There is no focal consolidation , pleural effusion , or pneumothorax . Double contour of the aortic knob is also concerning for underlying mass . There are no acute skeletal abnormalities .
    OUTPUT:
    
Increased soft tissue density in the superior mediastium concerning for underlying process . Recommend further evaluation with CT chest . These findings were entered into the critical results dashboard by Dr . ___ at 4 :30 pm .