English: Histopathology of endodermal sinus tumor with Schiller–Duval bodies. Original caption:
Figure 3. Histopathology (final specimen). The specimens (a,b) at 200× g magnification demonstrate
(a) papillary pattern combined with small tubopapillary endodermal sinus structure (Schiller–Duval body) in blue circle;
(b) marked tubulopapillary sinusoidal structure with central vascular core in longitudinal section (Schiller–Duval body);
(c,d) 400× g magnified image plus zoom of diagnostic round cystic Schiller–Duval body in a transverse section, with microcystic and papillary patterns around. The body has a central vessel surrounded by fibrous tissue, called the fibrovascular core, and it is surrounded by layers of the tumoral cells at the surface of that stalk. The structure is located in open cystic space also lined by tumoral cells. All those structures together are called a Schiller–Duval body and resemble primitive glomerulus.