Stephen Bird

Hi Xue,

This is a nice case,

The calcification that you are looking at is indeed within the petronius longus tendon as it wraps around the cuboid bone changing its direction to pass under the foot to insert onto the base of the 1st MT and the medial cuneiform.

This calcification is a normal variant and is known as the os peroneum.

In your case there is a localised tendinosis associated with this part of the peroneus lonus tendon and while this normal variant can most often be asymptomatic it certainly can be the catalyst for a local tendinosis event as it is in your case.

Personally I think if the calcification is beautiful and round with smooth borders it is usually asymptomatic, however when it is irregular like your example it is more likely to cause symptoms.

Lovely case mate,


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