Schiller–Duval body

Schiller–Duval body is a cellular structure seen by microscope in endodermal sinus tumors (yolk sac tumors) which are the most common testicular cancer in children. Schiller-Duval bodies are present in approximately 50% of these tumors, and if found are pathognomonic. They are named for Mathias-Marie Duval and Walter Schiller who described them in the late nineteenth century.