Accessory navicular syndrome
Citation, DOI and case data
Painful medial foot.
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There is an accessory bone of triangular shape measuring about 10 mm, adjacent to the posteromedial tuberosity of the navicular bone with a cartilaginous connection between them as well as bone marrow edema involving both the accessory ossicle and navicular bone.
Mild talocrural joint effusion is noted.
MRI features of an accessory navicular syndrome.
The accessory navicular syndrome occurs when a type II accessory navicular becomes painful due to movement across the pseudo-joint between the ossicle and the navicular bone. The MRI shows bone marrow edema involving both the accessory ossicle and navicular bone.