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Fractures of the fifth metatarsal base. Frontal radiograph (A) demonstrates fifth metatarsal base fractures based on location. Frontal radiograph (B) in a 24-year-old runner following inversion injury demonstrates an avulsion fracture of the fifth metatarsal base. Oblique radiograph (C) in an 11-year-old boy demonstrates an unfused fifth metatarsal base apophysis, a common fracture mimic.
