What Is Adenomyosis?
Adenomyosis, characterized by endometrial tissue within the myometrium, is primarily a disease of adult women, often diagnosed non-invasively with ultrasound and MRI, and can present with various symptoms or be asymptomatic.
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This chapter reviews what adenomyosis is and how it is studied across ages, defining it histologically as heterotopic endometrial glands and stroma embedded within the myometrium, while noting that adult disease predominates and that juvenile presentations are rare and may show localized cysts. It summarizes diagnostic approaches, stating that histology is the gold standard but that ultrasound and MRI are increasingly used for non-invasive diagnosis before hysterectomy or in women not undergoing surgery, and it highlights symptom heterogeneity (pelvic pain, heavy menstrual bleeding, infertility) as well as common coexisting conditions like fibroids and endometriosis. It also discusses biomarkers, noting that CA125 has limited utility based on a meta-analysis and that biomarker discovery has not reached clinical applicability, and it emphasizes classification challenges including mixed variants such as polypoid adenomyomas and other rare forms. Relevance to endometriosis: the chapter explicitly contrasts adenomyosis adult-onset with endometriosis onset in adolescents/before menarche and repeatedly notes frequent coexistence of adenomyosis with endometriosis, even though its main focus is defining and classifying adenomyosis.
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