Perineal mass at birth Ignacio Arroyo Carrera, Carlos Manuel Ojeda Espino, Rafael Ayuso Velasco, Yoana Franco Rodríguez

Perineal cutaneous appendage and anorectal malformation Julio César Moreno Alfonso, Ada Molina Caballero, Alberto Pérez Martínez

Systematic review of the validity of urine cultures collected by sterile perineal bags C. Ochoa Sangrador, A. Pascual Terrazas