Accessory navicular bone

Case contributed by Jack Ren


Medial foot pain

Modality: MRI

There is an accessory  bone located on patient's posteromedial tuberosity of the tarsal navicular bone. The accessory bone has a cartilaginous connection to the navicular best seen on T2 sequence which suggests it is a type II accessory navicular bone.

Case Discussion

Accessory navicular bones are also known as os tibiale externum or os naviculare and are considered a normal anatomical variant; although it can cause a painful tendinosis. 

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Case Information

rID: 23772
Case created: 7th Jul 2013
Last edited: 25th Nov 2015
Inclusion in quiz mode: Included

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