Sclerosing peritonitis associated with gynecological tumors: IgG4 peritoneal disease or a low grade spindle cell neoplasm?

Sclerosing peritonitis is a fibro-inflammatory condition of the peritoneum which is rarely associated with ovarian neoplasia e.g., thecoma. The etiology is largely unknown. To investigate whether sclerosing peritonitis associated with gynecological neoplasia is a reactive process and part of the spectrum of IgG4-related disease, or a neoplastic process and harboring molecular alterations known to occur in low-grade spindle cell neoplasms. Six...