*42-year-old male with complaint of pain at medial aspect of right foot. No history of trauma
Answer
Accessory navicular syndrome
Case Discussion:
MR images demonstrate type 2 accessory navicular bone, bone marrow edema signal in both the accessory ossicle and navicular, reflecting os naviculare syndrome.
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.
References:
1. Bernaerts A, Vanhoenacker FM, Van de Perre S et-al. Accessory navicular bone: not such a normal variant. JBR-BTR. 2005;87 (5): 250-2.
2. Mosel LD, Kat E, Voyvodic F. Imaging of the symptomatic type II accessory navicular bone. Australas Radiol. 2004;48 (2): 267-71.