Sesamoiditis os peroneum

Case contributed by Dr Chris O'Donnell

Presentation

Lateral foot pain for over 1 month with no relief from local NSAID cream application

Patient Data

Age: 55
Gender: Male
X-ray

Typical well-defined ossicle on the lateral border of the cuboid.  No sclerosis, fragmentation or erosion.

MRI

Ossicle is confirmed within the peroneus longus tendon as it enters the cuboid groove showing abnormal T2 signal (oedema) 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).

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Case information

rID: 43069
Case created: 22nd Feb 2016
Last edited: 24th Feb 2016
Inclusion in quiz mode: Excluded

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