Accessory spleen rupture may occur after blunt abdominal trauma or, more rarely, spontaneously. Although only few cases are described in adults, it is even more uncommon in children. We report the case of a 13-year-old boy with traumatic accessory spleen fracture. After a review of the literature, we discuss the diagnostic points that should raise the suspicion for accessory spleen fracture as well as how challenging the diagnosis by computed tomography can be.