Microscopic features (hematoxylin-eosin stain). A, Histopathologic examination revealed a subcapsular mass. The multilobular mass had a well-circumscribed margin with the adjacent liver tissue. B, Irregular endometrioid glands and cysts were haphazardly scattered among the smooth muscle bundles. Variable amounts of blood/congestion and hemorrhage, dense fibrosis, and hemosiderin-laden macrophages were associated with the endometrioid tissue. C, The whorled intersecting smooth muscle component was focally cellular. D, The endometrioid cysts were typically lined by a single layer of columnar cells and had secretory features.