Gliomatosis peritonei is a rare case occurring in association with teratoma of ovary. Only few cases have been reported in the literature so far. They are more commonly associated with immature teratomas as compared to mature teratoma of ovary. Though benign and graded as GRADE 0 by WHO fifth edition, they have a rare chance of malignant transformation as reported by some authors.

A 31-year-old, unmarried and nulliparous lady presented with complaints of progressive abdominal distension and pain lower abdomen since 1 month. On radiology she was confirmed to have a large abdominopelvic mass with multiple omental and peritoneal deposits. A right-sided salpingo-ophrectomy with omentectomy was performed. A diagnosis of immature teratoma Grade 1 with gliomatosis peritonei was given on histopathology.

Though uncommon, a possibility of GP may be kept in mind for young patients having abdominopelvic masses with peritoneal deposits. A close follow-up is essential to monitor its recurrence, associated adhesions and rarely malignant transformation.