Prepubertal Mature Teratoma of the Testis Observed During Retractile Testis Follow-Up

Abstract

A 15-month-old boy, who has been observed for retractile testis, presented with right scrotal swelling. Scrotal ultrasonography revealed a 20 mm “complex” multicystic mass without a solid component. The levels of serum tumor markers were within the normal range, and imaging studies indicated a simple testicular cyst or a benign testicular tumor. Because the intraoperative frozen section examination ruled out malignancy, we performed testis-sparing surgery. The definitive pathological findings included multiple types of epithelium with airway glands, cartilages, and brain tissue, leading to the final diagnosis of mature teratoma. The patient’s postoperative course was uneventful without recurrence or testicular atrophy.