Ovarian Signet Ring Stromal Tumor

**Semantic type:** Neoplastic Process

**Definition:** A rare, benign sex cord-stromal tumor that arises from the ovary. It is characterized by the presence of round cells with a single cytoplasmic vacuole and an eccentric nucleus resembling signet ring cells. Mucin stains are negative.

**Synonyms:** - Ovarian Signet-Ring Stromal Tumor