MRI
Abnormal intrasubstance increased fluid signal and focal thickening is present along with extensor carpi ulnar tendon (ECU) at the level of the wrist ulnar styloid and triangular fibrocartilage complex related to tendinosis.
Edema is s seen around the ECU tendon sheath.
A small synovial cyst is present at the dorsal aspect of the wrist and deep to the common extensor tendon.