title: CA 125 concentrations in ovarian 'chocolate' cyst fluid can differentiate an endometriotic cyst from a cystic corpus luteum.
abstract: In a prospective study, the concentrations of CA 125, 17 beta-oestradiol and progesterone were assayed in 52 consecutive ovarian cysts, laparoscopically suspected to be endometriomas. Cysts with dark brown 'chocolate' fluid (n = 42) were excised by CO2-laser endoscopy. Cysts with clear fluid were diagnosed by pathology as follicular cysts (n = 5) or pseudoperitoneal cysts (n = 5). Fluids (n = 53) aspirated during echo-guided puncture for in-vitro fertilization (IVF) were assayed simultaneously. Of the 42 women undergoing a cystectomy, the clinical diagnosis of an endometrioma was confirmed by pathology in only 68%, the other cases being corpora lutea (27%) or follicular cysts (5%). Cyst fluids from corpora lutea had lower CA 125 concentrations (< 1000 IU/ml) together with high 17 beta-oestradiol concentrations (> 2000 pg/ml) and/or high progesterone concentrations (> 100 ng/ml). Endometriotic cysts had either very high CA 125 concentrations (> 10,000 IU/ml) as occurred in 78% or lower CA 125 concentrations (< 1000 IU/ml) together with low 17 beta-oestradiol and/or progesterone concentrations. 'Chocolate' fluid-containing cysts aspirated during IVF had similar concentration profiles of CA 125, 17 beta-oestradiol and progesterone and the diagnoses derived from these concentrations were not contradicted in 19/27 women undergoing a laparoscopy within 4 months. In eight women, however, with high CA 125 concentrations in their cyst fluid, no endometriotic cysts were found at laparoscopy. Only 68% of cysts containing 'chocolate' material were endometriotic cysts and CA 125 could be useful in making this diagnosis. This method is recommended when dark brown fluid is aspirated in IVF.
authors: Department of Obstetrics and Gynaecology, University Hospital Gasthuisberg, Catholic University Leuven (KUL), Belgium.
authors: P R
authors: PR
authors: Koninckx
authors: M
authors: M
authors: Muyldermans
authors: P
authors: P
authors: Moerman
authors: C
authors: C
authors: Meuleman
authors: J
authors: J
authors: Deprest
authors: F
authors: F
authors: Cornillie
mesh_terms: D015295:Antigens, Tumor-Associated, Carbohydrate / Q000096:biosynthesis*; D003937:Diagnosis, Differential; D004715:Endometriosis / Q000175:diagnosis* / Q000276:immunology / Q000378:metabolism / Q000601:surgery; D004958:Estradiol / Q000032:analysis; D005260:Female; D005497:Follicular Cyst / Q000175:diagnosis / Q000378:metabolism; D006801:Humans; D053685:Laser Therapy; D010048:Ovarian Cysts / Q000175:diagnosis* / Q000276:immunology / Q000378:metabolism; D010051:Ovarian Neoplasms / Q000175:diagnosis* / Q000276:immunology / Q000378:metabolism / Q000601:surgery; D011374:Progesterone / Q000097:blood; D011446:Prospective Studies
chemical_list: D015295:Antigens, Tumor-Associated, Carbohydrate; D011374:Progesterone; D004958:Estradiol