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;

Toxics and atypical manifestations. Vasculitis associated with levamisole-adulterated cocaine. A case report Silvia Calpena-Martínez; Fernando Tornero-Romero; Luis López-Cubero; Juan A. López-López;

Purtscher-like retinopathy with bilateral vasculitis and vascular occlusion as the first manifestation of systemic lupus erythematosus. A case report Juan Carlos Mejía-Turizo; Claudia Eugenia Durán-Merino; Paula Andrea Gómez-Rodríguez; Claudia Marcela Vanegas-Ramírez;