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

Bead-like lesion at perineal region Juan Pablo Velasco-Amador, Israel Pérez-López, Ricardo Ruiz-Villaverde

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