case_images: PMC8243095_01
case_images: Pelvic-enhanced MRI showed mild enhancement of the lesion, and the lesion
  seemingly not invaded muscular layer.
case_images: 10.1177_2050313X211027734-fig1.jpg
case_images: PMC8243095_01_10.1177_2050313X211027734-fig1.jpg
case_images: fig1-2050313X211027734
case_images: Pelvic-enhanced magnetic resonance imaging (MRI) showed a mild enhancement of the lesion, and the lesion seemingly not invaded muscular layer (Figure 1).
case_images: Histological features of endometrial YST. Multiple separated tumor tissue
  with a small piece of normal endometrium (A x20), most area showing a
  tubulopapillary pattern (B x40) with classical Schiller-Duval bodies (C
  x100), a microcystic or reticular pattern (D x100), and focal glandular
  pattern (E x400), hyaline globules in the cytoplasm (F x200).
case_images: 10.1177_2050313X211027734-fig2.jpg
case_images: PMC8243095_01_10.1177_2050313X211027734-fig2.jpg
case_images: fig2-2050313X211027734
case_images: Microscopically, pure endometrial YST without any other type of germ cell tumor or somatic carcinoma components was found (Figure 2).
case_images: Immunohistochemical profile of endometrial YST. Diffuse positive for AFP (A
  x100), GPC-3 (B x100), SALL-4 (C x100), and AE1/AE3 (D x100). Focal positive
  for PAX8 (E x100) and negative for EMA (F x100).
case_images: 10.1177_2050313X211027734-fig3.jpg
case_images: PMC8243095_01_10.1177_2050313X211027734-fig3.jpg
case_images: fig3-2050313X211027734
case_images: ER, PR, CD30, OCT4, HNF-1beta, Napsin A, and CD117 were all negative (Figure 3).