Multiossicle accessory navicular bones – A symptomatic presentation of rare variant anatomy

Abstract

The foot and ankle are common sites for variant anatomy, of which a known symptomatic entity is the accessory navicular bone. These accessory ossicles may have a varied appearance based on their relationship to the parent navicular and are usually solitary and bilateral. However, a rare multi-ossicle variant is also described, which may lead to an erroneous diagnosis of navicular avulsion fracture with fragmentation in the setting of an ankle injury. We describe such a case of the incidental multi-ossicle accessory navicular bone, which proved a diagnostic confounder in a lady with a history of an ankle injury.