Figure 11
Mucinous cystic neoplasm (with ovarian-type stroma). The distinctive hypercellular stroma, which shows all the morphologic and immunophenotypic characteristics of ovarian stroma, has become nearly a requirement for the diagnosis of this tumor type. The epithelium in mucinous cystic neoplasia may show various degrees of atypia, ranging from adenoma (lower left) to frank carcinoma in situ (upper).
