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Updated: Aug 15, 2026

Fate Mapping of Human Embryonic Stem Cells by Teratoma Formation
Published on: August 1, 2010
Bilateral testis tumors in an infant: synchronous teratoma and epidermoid cyst
J T Mansfield1, P C Cartwright
1Department of Surgery, University of Utah School of Medicine, Salt Lake City.
Abstract:
Teratoma ranks second in frequency to yolk sac carcinoma among testicular germ cell tumors in infants, accounting for 25% of cases. Testicular teratomas are uniformly benign in children younger than 24 months old. Epidermoid cysts are tumor-like lesions of unknown etiology, probably monodermal teratomas, comprising 3% of all pediatric testis tumors. Bilaterality is rare for both tumors. We report a case of a synchronous left testis teratoma and a right testis epidermoid cyst. Appropriate therapy is discussed.
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