Avascular Necrosis of the Type II Accessory Navicular Bone: A Rare Case Report

Abstract

The accessory navicular bone (ANB) is one of the most common accessory ossicles of the foot. Fewer than 1% of ANBs are symptomatic, and most of the symptomatic ANBs are type II ANBs. Avascular necrosis of the type II ANB is an uncommon cause of symptomatic accessory navicular syndrome and also a rarely reported condition in the podiatric medical literature. This rare disorder must be distinguished from other painful conditions of the ANB and should be considered in differential diagnoses. We present a case of avascular necrosis of the type II ANB with sclerosis on radiographs and magnetic resonance images in a 46-year-old woman.

Foot pain in children and adolescents: a problem-based approach in musculoskeletal ultrasonography

“…Type III (cornuate navicular type) forms a bony bridge between the accessory and native navicular. The vast majority of symptomatic adolescents have a type II accessory navicular [ 48 ].…”