Abnormal configuration of the peroneus brevis tendon being C-shaped enveloping adjacent peroneus longus tendon (boomerang appearance in axial) associated with distention of the tendon sheath with fluid signal. Picture consistent with longitudinal peroneus brevis tendon split tear with tenosynovitis.
Intact Achilles tendon and other tendons around the ankle.
No evidence of ligamentous injury.
No soft tissue mass lesions.
Lateral malleolar subchondral pseudo-cystic changes.
Minimal ankle joint effusion.