Fig. 6

Pathological findings. a, b Hematoxylin-eosin staining (a × 40, b × 200). The cyst wall showed an attenuated endothelial lining, surrounding rich adipose tissue and scattered smooth muscle fibers (b arrows). Immunohistochemical staining showed that the flat endothelial cells were positive for the endothelial markers CD31 (c × 400) and factor VIII-related antigen (d × 400), partially positive for the lymphatic endothelial marker D2-40 (e × 400) and the undifferentiated pluripotent stem cell marker CD34 (f × 400), and negative for cytokeratin (AE1/AE3; g × 400) and the mesothelial marker calretinin (h × 400)