Giant bilateral prepubertal-type teratomas in a postpubertal patient: An illustrative case and review of the literature.

Prepubertal-type teratomas are uncommon, especially in postpubertal male patients. We document a case of a 28-year-old man with a lifelong history of bilateral testicular masses who presented with scrotal fistulas and no clinical evidence of extratesticular disease. Bilateral radical orchiectomies demonstrated large bilateral solid and cystic masses that contained grossly visible hairs. Microscopically, both tumors consisted of pure teratomas comprising a mixture of mature tissues derived from the three embryonic layers. Germ cell neoplasia in situ was not identified, and fluorescence in situ hybridization studies demonstrated the absence of i(12p), supporting a diagnosis of prepubertal-type teratoma. The absence of metastases in this patient with longstanding tumors highlights the benign nature of prepubertal-type teratomas affecting postpubertal patients. Furthermore, this case illustrates that at least a subset of prepubertal-type teratomas seen in adult men represent a late diagnosis of a largely pediatric entity. Additionally, we performed a comprehensive review of the literature on this topic.