Cholecystocutaneous fistula, an uncommon pathology today E. Ballesteros-Suárez; F. Navarro-Tovar; C.Z. Díaz-Barrientos; E.I. Marín-Pardo; E. Hernández-Pérez;

Primary anorectal malignant melanoma as a rare cause of hematochezia A. Arrubla-Gamboa; D. Martínez-Acitores de la Mata; A. Larrea-Ramírez;

Anal melanoma: Atypical cause of rectal bleeding in an older adult patient G. Castillo-López; M.C. Villanueva-Sánchez;