Os vesalianum pedis detected with bone SPECT/CT.

We present an 18-year-old man with pain at the lateral aspect of his left foot. Radiograph showed abnormal ossicle in the proximal aspect of the left fifth metatarsal tuberosity, which was articulated with the fifth metatarsal and cuboid bones. Bone scintigraphy and SPECT/CT demonstrated increased uptakes at the ossicles in the proximal aspect of both fifth metatarsal bones. CT revealed that the ossicle and the adjacent bones have well-corticated margins. The diagnosis was os vesalianum, a rare accessory bone of the foot. We have reported the SPECT/CT bone scan findings of the os vesalianum.