Cystic degeneration of the peroneus brevis tendon
Recalcitrant pain in the lateral heel. No history of trauma.
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Th peroneus brevis tendon shows a longitudinal split tear at the malleolar level with anterior migration of the longus tendon. The course of the brevis tendon proximal and distal to the lateral malleolus shows a tubular transformation with a thin outer hypointense shell containing fluid equivalent signal.
The findings are probably caused by extensive mucoid degeneration of the tendon fibers in chronic attrition damage. They are identical to intratendinous ganglia described in a few case reports in the literature1.