Testis-Preserving Tumor Enucleation Is Applicable in Children with Immature Testicular Teratoma

Introduction: This study investigated the biological characteristics of immature testicular teratoma in children and explored the feasibility of testis-preserving tumor enucleation. Methods: We retrospectively reviewed the cases of 23 children who received a pathologic diagnosis of immature testicular teratoma between January 2005 and December 2018. Ages ranged from 16 days to 13 months (mean: 6 months and 5 days). Painless testicular enlargement was the main clinical manifestation, and the course of disease ranged from 20 days to 4 months (mean: 1.4 months). The tumor volume ranged from 1.5 × 1.2 × 0.5 to 6 × 5 × 4.5 cm. Elevated levels of alpha-fetoprotein were measured in 21 patients. Preoperative ultrasound examination showed a cystic/solid mass with calcification. Results: Excision of the affected testis was done in 10 patients and testis-preserving tumor excision in 13 patients. Postoperative chemotherapy was not employed. Nineteen patients were followed up for 1–10 years, and all showed disease-free survival without recurrence or metastasis. Conclusion: Immature testicular teratoma is found predominantly in children aged