WFDC2 and Endometrial Cyst: In other subgroups of the group II the significant differences of HE4 in the peritoneal fluid were found between the functional cysts and teratomas, (p = 0.0391), borderline malignancy tumors and teratomas, (p = 0.008), myomas and teratomas (p = 0.0225) and between the endometrial cysts and teratomas, (p = 0.0217).