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[A case of neonatal testicular torsion].

An infant normally delivered at the 38th week of gestation was referred to our department one day after birth for a firm and painless right hemiscrotal mass with bluish coloration. Since contralateral scrotum showed swelling, we performed emergency surgery on that day. The right spermatic cord was constricted due to extravaginal torsion, and degree and direction of torsion was unclear since the spermatic cord was already organized. Right testis showed irreversible necrotic change, requiring orchiectomy. We confirmed that left testis was intact and performed orchidopexy. Since high incidence of contralateral asymptomatic torsion has been reported in patients with prenatal testicular torsion, emergency surgery should be considered when contralateral scrotum shows abnormal findings.