Mediastinal yolk sac tumor infiltrating the heart.

Background: As a rare tumor, yolk sac tumor is a type of neoplasm that appears like the yolk sac, extraembryonic mesenchyme, and allantois. The mediastinum is the second most frequent area after the gonadal area.

Case Report: We present an extremely rare case of 15 years old boy with mediastinal yolk sac tumor.