Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Interval removal of right chest tube . Near the previous location of the chest tube , there is an approximately ___ x 3 cm irregularly - shaped opacity with well - defined borders and homogeneous density that appears to be arising from the chest wall and may represent a fluid collection . No other significant changes from earlier today .
    OUTPUT:
    
Right upper lung fluid collection may possibly be blood that is related to removal of the chest tube .