Unusual Presentation, Relapse, and Metastasis of a Pediatric Testicular Yolk Sac Tumor: Case Report.

Testicular tumors are not uncommon in children and represent 1%-2% of all pediatric malignancies. Prepubertal testicular yolk sac tumor is the most common childhood testicular cancer, accounting for 70%-80% of all cases. The clinical presentation varies from one patient to another; most common presentation is painless scrotal mass. Herein, we present a case of pediatric patient with a testicular yolk sac tumor who had unusual presentation followed by a local relapse and metastasis and continued to have high markers while he was on chemotherapy, then underwent retroperitoneal lymph node dissection and local recurrence excision.