<p style="padding: 0px; margin-top: 0px; margin-bottom: 0px; box-sizing: border-box; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); border: none; color: rgb(102, 102, 102); font-family: "Microsoft Yahei", Arial, sans-serif; font-size: 16px; white-space-collapse: preserve-breaks; background-color: rgb(255, 255, 255);"><span style="padding: 0px; margin: 0px; box-sizing: border-box; font-family: 黑体, SimHei;">In gynecological clinics, we often encounter young women who are suffering from severe dysmenorrhea. Their pain is real and intense, but sometimes it is classified as a "functional" problem because the imaging report is "normal", causing the true cause to be overlooked. However, behind this diagnostic "fog", there may be a tiny cavity buried deep in the myometrium that "bleeds" alone every month - this is the protagonist we will discuss today: the accessory cavitated uterine mass (ACUM).</span></p><p style="padding: 0px; margin-top: 0px; margin-bottom: 0px; box-sizing: border-box; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); border: none; color: rgb(102, 102, 102); font-family: "Microsoft Yahei", Arial, sans-serif; font-size: 16px; white-space-collapse: preserve-breaks; background-color: rgb(255, 255, 255);"><br/></p><p style="padding: 0px; margin-top: 0px; margin-bottom: 0px; box-sizing: border-box; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); border: none; color: rgb(102, 102, 102); font-family: "Microsoft Yahei", Arial, sans-serif; font-size: 16px; white-space-collapse: preserve-breaks; background-color: rgb(255, 255, 255);"><span style="padding: 0px; margin: 0px; box-sizing: border-box; font-family: 黑体, SimHei;">This unfamiliar-sounding name is gradually being recognized as one of the important causes of severe secondary dysmenorrhea in young women. It is not only about pain, but also about women's fertility potential. As I emphasized, in the field of diagnosis and treatment of uterine diseases, "seeing" is the beginning of healing. This article will combine an in-depth case study article with relevant medical literature to demystify ACUM and highlight its latest minimally invasive treatment options.</span></p>