Diagnostic challenge: Bethlem myopathy mimicking inflammatory myopathy Olga Rusinovich-Lovgach, Luz Morán, Oscar Toldos-Gonzalez, Marta Vaquero Martínez, Borja Cabal-Paz, José Luis Andréu Sánchez

Dermatomyositis and meningioma in the same patient Raquel Almodóvar, Daniel Paul Lindo, Helena Martín, Ramón Mazzuchelli, Javier Pardo, Francisco Javier Quirós, Pedro Zarco

External validation of the 2017 ACR/EULAR classification criteria for inflammatory myopathies in a Mexican cohort: Role of autoantibodies in the diagnosis and classification of patients with inflammatory myopathies Grisel Guadalupe Sánchez-Mendieta, David Vega-Morales, Miguel Ángel Villarreal-Alarcón, Jesús Eduardo Compean-Villegas, Ilse Andrea Moreno-Arquieta, Dionicio Ángel Galarza-Delgado