Elbow MRI 14M chronic sts, occasional pain, asymmetric “growth” Please help

Mass medial to distal biceps (red arrow) in close proximity to the distal brachialis tendon (blue arrow), but really between the two

https://musculoskeletalkey.com/bursitis-4/

Peripheral and septal dark T1/PDFS signal, seems to bloom on GRE.
No mineralization on XRs from August.
I want to call this PVNS (GCTTS).
I don’t think the brachialis has a tendon sheath.
I found an anatomic reference for elbow bursae…I want to call this PVNS of antecubital interosseous bursa (which I never heard of until now)…do you agree?
Is there any DDx?

Hilary

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