Granulomatosis with polyangiitis and skin ulcers mimicking pyoderma gangrenosum: A case report of a diagnostic challenge Linda Navarrete-Motta; Onaldo-José Barrios; Sebastián Gil-Tamayo; Daniela Saaibi; Juan M. Gutiérrez; Daniel G. Fernández-Ávila; Santiago Bernal-Macías; Jorge L. Rodríguez; María-Claudia Díaz;

Agreement between biopsy and renal function in pediatric patients with lupus nephritis. A retrospective study Jessica Forero-Delgadillo; Vanessa Ochoa; Laura Torres-Canchala; Natalia Duque; Daniela Torres; Carlos Jiménez; Jaime Manuel Restrepo;

Hypertrophic pachymeningitis in a patient with ANCA negative granulomatosis with polyangiitis: A case report Jorge Huaringa-Marcelo; Rubén Kevin Arnold Tapia-Orihuela; David Loja-Oropeza;