Focal Adenomyosis

Explore localized adenomyosis (adenomyoma): causes of pain and bleeding, how ultrasound/MRI spot it, and when medicines or fertility‑sparing surgery may help—plus overlaps with endometriosis and what to expect in care.

Overview

Focal adenomyosis (adenomyoma) occurs when endometrial glands and stroma grow within a contained area of the uterine muscle, forming a localized, often tender nodule. Unlike diffuse adenomyosis that involves the uterine wall more broadly, a focal lesion can cause one‑sided or pinpoint cramping, heavy bleeding, or pain with sex. On imaging it may resemble a fibroid, but it lacks a crisp capsule and can show small cystic spaces. Endometriosis may coexist, which can intensify pain and period symptoms.

Diagnosis typically starts with high‑quality transvaginal ultrasound and can be refined with MRI to confirm location, size, and distance from the uterine cavity—details that guide treatment and fertility planning. Many people improve with hormonal options such as progestin IUDs or oral therapies; when symptoms persist or fertility is affected, uterus‑sparing excision (adenomyomectomy) may help selected patients. Learn how focal disease is identified and managed, how it differs from conditions like Fibroids, and when to consider advanced care. For deeper imaging detail see Imaging & Diagnosis (MRI, Ultrasound), surgical decision‑making in Surgical Options, and family‑building guidance in Fertility Considerations.

Common Questions

What does “heterogeneous myometrium” mean on imaging?
A heterogeneous myometrium means the uterine muscle looks uneven in texture on ultrasound or MRI rather than smooth and uniform. It is an imaging description, not a diagnosis by itself. Adenomyosis is one common reason, but imaging cannot always confirm it with certainty.
Can adenomyosis cause clots and heavy flooding?
Yes, adenomyosis can cause very heavy menstrual bleeding with flooding (sudden gushes) and clots, especially when blood pools in the uterus before it exits. These symptoms can also have other causes, and severe bleeding can lead to iron deficiency and fatigue.
What is adenomyosis?
Adenomyosis is a condition where tissue similar to the uterine lining grows into the muscular wall of the uterus. This tissue responds to hormonal cycles and can cause heavy or prolonged bleeding, severe cramping, pelvic pain or pressure, and pain with sex.
When is adenomyomectomy recommended, and how does it affect pregnancy?
Adenomyomectomy is typically considered when focal adenomyosis causes significant pain or heavy bleeding despite medical treatment, grows, or may affect fertility. Some patients are advised to allow healing before pregnancy and may be counseled toward cesarean delivery because of uterine repair.