Miranda-Pacheco, J.; Abuchar-Vásquez, J. S. .; Salgado-Espitia, V.; Zabala-Aparicio, W. A.; Pastor-Sierra, K. Atypical Spindle Cell Osteosarcoma in the Diaphysis and Proximal Epiphysis of the Tibia: Clinical Case Report. Rev. Invest. Univ. Quindío 2023, 35, 36-42.