Cystic Endometrioma with Coexisting Fibroma Originating in a Supernumerary Ovary in the Rectovaginal Pouch

Figure 6

A primordial follicle in the ovarian stroma. (a) Note the spindle cell layer (indicated by S) around the endometrial tissue (indicated by E) of cystic endometriosis. A primordial follicle (indicated by an arrow) is present in the spindle cell layer. HE stain. (b) Many spindle cells show positivity for PgR immunostain, which indicates that the spindle cell layer is an ovarian stroma. (c) High-power view of primordial follicle. HE stain. (d) Granular cells consisting of primordial follicle show positivity for alpha-inhibin immunostain.

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