**22. Histological features of necrotic pseudoxanthomatous nodules**

These lesions occur to postmenopausal women and are multiple nodules usually attached to peritoneum or floating free in the peritoneal cavity. They consist of a central fibrotic or hyalinized core with central necrosis surrounded by lipid laden histiocytes. Occasionally multiple sections will reveal remnants of endometriotic foci, and typical ovarian endometriosis co-exists.
