Obstetrics and Gynecology· Topic 11.6 Menstrual disorders, contraception, and menopause· 11.6.3

Adenomyosis

Adenomyosis is the presence of endometrial glands and stroma within the myometrium, producing a diffusely enlarged, boggy, symmetric uterus with heavy menstrual bleeding and severe dysmenorrhea; it is a pathologic diagnosis, supported clinically by exam and ultrasound or MRI, and definitively treated with hysterectomy.

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What this article covers

  • Overview

    Ectopic endometrium within the myometrium: adenomyosis is the presence of endometrial glands and stroma extending into the myometrium, the middle muscular layer of the uterus.

  • Epidemiology

    Occurs in reproductive-age women, presenting as a cause of secondary dysmenorrhea and abnormal uterine bleeding in this population.

  • Risk factors

    Prior uterine surgery, such as dilation and curettage, which disrupts the endometrial-myometrial junction and facilitates invasion of glandular tissue into the myometrium.

  • Pathophysiology

    Invasion of endometrial glands and stroma into the myometrium: the defining process, caused by extension of glandular endometrial tissue into the muscular uterine wall.

  • Clinical features

    Heavy and/or prolonged menses (menorrhagia): cyclic but heavy, often prolonged menstrual bleeding is the leading complaint.

  • Differential diagnosis

    Uterine fibroids (leiomyoma): uterus is enlarged but irregularly shaped, firm, and nontender rather than symmetric and boggy; distinguished by exam and/or ultrasound.

  • Diagnosis

    A pathologic diagnosis; imaging is supportive, not confirmatory: definitive diagnosis is made only on pathology, typically at hysterectomy; transvaginal ultrasound and MRI raise or support the…

  • Management

    First, confirm pregnancy has been excluded and secondary causes of abnormal bleeding have been considered, since management targets symptom control rather than reversing the underlying myometrial infiltration.

  • Complications

    Iron deficiency anemia: the principal complication, caused by prolonged and/or heavy menstrual blood loss; confirm with a complete blood count and treat with oral iron replacement as above.

  • Prognosis

    Hysterectomy is curative: removal of the uterus eliminates the source of symptoms and is the definitive treatment when medical therapy fails.

  • Prevention

    No proven primary prevention: there is no screening test or intervention that prevents the development of adenomyosis.

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