Atypical spindle cell osteosarcoma in the diaphysis and proximal epiphysis of the tibia: clinical case report. Revista de Investigaciones Universidad del Quindío, [S. l.], v. 35, n. 1, p. 36–42, 2023. DOI: 10.33975/riuq.vol35n1.898. Disponível em: https://ojs.uniquindio.edu.co/ojs/index.php/riuq/article/view/898. Acesso em: 25 jun. 2026.