Fig. 4.

Microscopic findings. a Area of deciduosis, accompanied by myxoid degeneration, was widely seen in the subserosal layer (area marked by arrowheads) of the tip side (bar: 2.5 mm). b In a high power magnification, deciduosis is composed of large polygonal cells with abundant eosinophilic cytoplasm and centrally placed uniform nuclei, characteristic of decidual cells (bar: 2.5 µm). c Immunohistochemical evaluation showing diffuse positivity for vimentin in the decidual cell cytoplasm (bar: 250 µm)