Purpose. Inguinal hernia is one of the most common surgical pathologies in childhood. Any of the abdominal organs can slide into the hernial sac and become incarcerated there. In girls, the fallopian tubes, ovaries, uterus, and - rarely - ovarian cysts can form the sliding component of an inguinal hernia. The aim of this study was to investigate the diagnostic value of preoperative sonographic examination in girls with nonreducible inguinal masses.