ACUM, an easily underdiagnosed cause of dysmenorrhea-A case report.

This report described three cases with long-term severe dysmenorrhea, and these cases were referred to our department for medical help. The diagnosis of accessory cavitated uterine malformation (ACUM) was considered based on symptoms and ultrasound/MRI findings. Moreover, a combined approach involving hysteroscopic surgery and laparoscopic surgery was undertaken, and no complications occurred during surgery and in the post-operative period. It is important to consider ACUM in patients with severe dysmenorrhea that does not respond to medical management. Surgery is the most effective treatment for this anomaly.