Fig. 4.

a Microscopic view. The mass is located submucosally and is relatively well delineated. Compactly packed elongated or rounded tumor cells with scattered larger cell clusters are seen. a Hematoxylin and eosin staining : low-power view (×10). b Hematoxylin and eosin staining : high-power view (×100). b Immunohistochemical analysis. The elongated tumor cells are positive for a smooth muscle actin; negative for b CD10, a marker of endometrial stromal cells; and focal positive for c α-inhibin and d calretinin, markers of sex cord differentiation