Presentation
Lateral foot pain for over 1 month with no relief from local NSAID cream application
Patient Data
Typical well-defined ossicle on the lateral border of the cuboid. No sclerosis, fragmentation or erosion.
Ossicle is confirmed within the peroneus longus tendon as it enters the cuboid groove showing abnormal T2 signal (edema) with T2 signal in the adjacent tendon and surrounding soft tissues indicative of inflammation.
Case Discussion
Os peroneum is a sesamoid bone in the peroneus longus as it enters the cuboid groove. They are common, occuring in up to 30% of the population. Akin to great sesamoids of the big toe, these ossicles can become inflammed (sesamoiditis) and painful. Importantly if inflammation persists they can be associated with tendon rupture. The syndrome of such sesamoiditis is known in the clinical literature as POPS (painful os peroneum syndrome).