Table 1.

Classifications of intrauterine adhesions

March, 1978	Minimal (< ¼ of cavity; thin, filmy), moderate (¼–¾ of cavity; no agglutination of walls, partial occlusion of ostia) or severe (> ¾ of cavity, agglutination of walls, thick bands or involving tubal ostia) based on hysteroscopic (HSC) assessment of cavity involvement
Hamou, 1983	Isthmic, marginal, central or severe based on HSC
Valle, 1988	Mild (filmy adhesions composed of basal endometrium producing partial or complete uterine cavity occlusion), moderate (fibromuscular adhesions with thick bands covered with endometrium that may bleed when divided) or severe (bands composed of connective tissue lacking endometrium) based on HSC and extent of occlusion based on HSG
American Fertility Society, 1988	Mild, moderate or severe based on endometrial cavity obliteration, appearance of adhesions on HSC/HSG and patient menstrual characteristics
European Society of Hysteroscopy, 1989	Grade I-IV based on HSC, HSG and clinical symptoms
Donnez, 1994	Six grades based on location; HSC, HSG used for assessment
Nasr, 2000	Prognostic score by incorporating menstrual and obstetric history with IUA findings on HSC

Adopted from: AAGL practice report: practice guidelines on intrauterine adhesions developed in collaboration with the European Society of Gynecological Endoscopy (ESGE) [2]