Fig. 1

a MRI (T2 weight imaging) revealed that the medial-posterior aspect of the proximal fibula was involved by tumor combined with the tibial vessels and nerve. b After adjuvant chemotherapy, good result was observed with obvious ossified shell formation and tumor shrink. However, in terms of handling the vessel and nerve, it is difficult to deal from one lateral approach (yellow arrow); we recommended the double approach (adding medial approach, red arrow)