Among the wide range of gynecological conditions that affect women, adenomyosis occupies a rather special place due to its complexity, chronic evolution, and profound impact on quality of life. Although it often remains underdiagnosed, it is far from rare. Essentially, adenomyosis occurs when endometrial tissue, which normally lines the uterine cavity, invades the uterine muscle layer known as the myometrium.
In simpler terms, adenomyosis can be described as a situation where the tissue that should grow only inside the uterus begins to grow within the muscular wall of the uterus itself. Consequently, this abnormal growth leads to uterine enlargement, chronic inflammation, painful menstruation, and abnormal bleeding.
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2. Causes and Mechanisms of Adenomyosis
Although the exact cause of adenomyosis is still not fully understood, several theories have been proposed to explain its origin.
Firstly, one major hypothesis suggests that repeated trauma to the uterine wall—for instance, after childbirth, cesarean section, curettage, or uterine surgery—creates small openings through which endometrial cells can penetrate the muscle layer. Over time, these cells grow abnormally within the myometrium, forming adenomyotic lesions.
Secondly, another theory proposes a congenital origin, meaning that during fetal development, some endometrial cells may become trapped within the uterine muscle and later become active under hormonal influence.
Furthermore, hormonal imbalance, particularly involving estrogen, plays a central role. Indeed, adenomyosis is considered an estrogen-dependent disease, explaining why it tends to appear in women of reproductive age and usually regresses after menopause when estrogen levels decline.
Lastly, chronic inflammation and genetic predisposition have also been mentioned as potential contributors, further illustrating the multifactorial nature of this condition.
3. Main Symptoms of Adenomyosis
Adenomyosis can manifest in many ways, and its symptoms often overlap with other gynecological disorders such as endometriosis or uterine fibroids. Nonetheless, some features remain characteristic:
Heavy and prolonged menstrual bleeding (menorrhagia), often leading to anemia.
Severe menstrual cramps (dysmenorrhea) that worsen with time and are resistant to common painkillers.
Chronic pelvic pain, sometimes persisting even outside of menstruation.
Pain during sexual intercourse (dyspareunia).
Uterine enlargement, which can make the lower abdomen appear swollen or tender.
Infertility or recurrent miscarriages, due to interference with embryo implantation.
These symptoms vary from woman to woman; some may experience debilitating pain, while others may remain asymptomatic for years, with the disease discovered incidentally during imaging for another reason.
4. Diagnosis
The diagnosis of adenomyosis has significantly improved thanks to advances in medical imaging.
The first-line diagnostic tool is usually a transvaginal ultrasound, which can reveal an enlarged uterus with an irregular texture or small cystic areas in the myometrium.
However, the gold standard for diagnosis is magnetic resonance imaging (MRI), which offers a more detailed view of uterine tissue and can distinguish adenomyosis from other conditions such as fibroids.
In certain cases, histological examination (microscopic analysis of uterine tissue) after hysterectomy remains the only definitive way to confirm adenomyosis, especially when the diagnosis is uncertain.