Sclerosing stromal tumor of the ovary: Sclerosing stromal tumor of the ovary is a rare benign sex cord-stromal tumor of the ovary, which occurs predominantly in the second and third decades of life.[13] Relevant studies have shown that inhibin and calretinin are important immunohistochemical markers, which are helpful for the diagnosis of sclerosing stromal tumor of the ovary.[14] Radiologically, T1WI displayed hypointensity, and T2WI showed mixed hyperintensity, the cystic area in the center of the lesion showed significant hyperintensity, that is, “lake-island” sign. This evidence concerns the gene CALB2 and ovarian sex cord-stromal tumor.