Unknown primary tumor sites in spinal metastasis - Candido, Priscila Barile Marchi; Pinheiro, Romulo Pedroza; Peria, Fernanda Maris; Toledo, Vinicius Nogueira; Costa, Herton Rodrigo Tavares; Defino, Helton Luiz Aparecido (Coluna/Columna, 2021)