Microcystic Stromal Tumor of the Ovary With Mutation in Exon 3 of β-catenin: A Case Report

Abstract

Summary: Microcystic stromal tumor of the ovary is a very rare ovarian tumor with distinctive microcystic histologic features and a characteristic immunophenotype of stromal tumor. However, its origin, tumor pathogenesis, and prognosis have not been well established until now. We report a very unusual case of a microcystic stromal tumor of the ovary with a mutation in exon 3 of the b-catenin (CTNNB1) gene. Macroscopically, the fragmented ovarian tumor showed a diffuse solid mass. Microscopically, the tumor had a pathognomonic histologic pattern of solid and cellular areas with microcysts and fibrous hyalinized stroma. Immunohistochemical staining with CD10, vimentin, CD99, and b-catenin showed positive expression. However, a-inhibin and E-cadherin showed negativity. Mutational analysis revealed a point mutation in exon 3 of the b-catenin (CTNNB1) gene. Key Words: Microcystic stromal tumor— Ovary—b-Catenin—Mutation.