What does fluid in radioulnar joint mean thanks

Fluid : Fluid in the radio ulnar joint can mean many things. There is always a history behind all the events , how did all start or why the MRI of the wrist was done. All inflamatatory arthropaties could give fluid there, aldo the infecctious and crystal induced athrtititis could. Trauma cangive you fluid , and even local problems , such as caroal tunnel , a local reaction to an aseptic necrosis of any carpal bone would also and so on . The causes can be many ......................................It has to be evaluated in each patients contexty.