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There is an ill-defined soft tissue mass of tubular pattern within the anconeus muscle, iso-to mildly hyperintense on T1WI, markedly hyperintense on T2WI and T2WI fat sat, containing small channels as well as a punctate phlebolith of low signal intensity. The postcontrast sequences show a progressive and heterogeneous enhancement. Note a bone remodeling of the adjacent cortical ulna.