Diagnosis
What does “heterogeneous myometrium” mean on imaging?
The short answer
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.
Medically reviewed by Dr. Steven Vasilev MD
Advanced Endometriosis Minimally-Invasive Robotic Excision Surgeon, Director of Lotus Endometriosis Institute · Updated Oct 2026
A “heterogeneous myometrium” means the uterine muscle (the myometrium) looks uneven in texture on ultrasound or MRI instead of smooth and uniform. It’s a descriptive imaging term, not a diagnosis by itself, and it tells us there may be changes within the uterine wall that deserve a closer look.
One common reason this shows up is adenomyosis, where endometrial-like tissue grows into the uterine muscle and can create a patchy, mixed-appearance pattern (sometimes focal, sometimes more diffuse). Depending on the rest of the report, radiologists may also comment on related features such as junctional zone irregularity on MRI or other signs that increase (or decrease) confidence for adenomyosis.
If your report feels vague, that’s not uncommon: imaging can suggest adenomyosis but can’t always confirm it with certainty. Our team can review your symptoms alongside the details of your imaging (and, when needed, recommend the right next diagnostic step) to clarify what this finding likely means for your pain, bleeding, or fertility goals.
Where to go from here
Understand it, compare it with what you're feeling, then talk it through with us.
Step 1 · Understand
Understand the condition
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Confused by Your Imaging Results?
A heterogeneous myometrium may signal adenomyosis or other uterine changes that need expert evaluation. Our specialists can help interpret your imaging and guide your next steps.
Questions people ask next
All diagnosis questionsHow is adenomyosis described on ultrasound reports?
Ultrasound reports usually describe features suggestive of adenomyosis rather than a single yes/no finding. Reports may note an enlarged uterus, patchy or uneven uterine muscle, cysts within the muscle, or a localized mass-like area called an adenomyoma.
How is diffuse adenomyosis confirmed on MRI or ultrasound?
Diffuse adenomyosis is usually suggested, not proven, by MRI or ultrasound findings that match your symptoms. MRI may show a thickened junctional zone and tiny cysts in the uterine muscle; ultrasound may show streaky muscle, asymmetric thickening and fan-shaped shadowing.
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.
Diffuse vs focal adenomyosis: what’s the difference?
Diffuse adenomyosis is spread throughout much of the uterine muscle, while focal adenomyosis is confined to one area and may form a mass called an adenomyoma. A focal lesion may be better suited to uterus-sparing surgery, while diffuse disease can be harder to remove without weakening the uterus.
Further reading
Diffuse Adenomyosis: Diagnosis and Treatment You Can Act On
A clear guide to diffuse adenomyosis: what it means, how TVUS and MRI diagnose it, and practical treatments, from hormonal IUDs to uterus-sparing options.
Focal Adenomyosis: What Your Diagnosis Means and Next Steps
Learn what a focal adenomyosis diagnosis means, how TVUS and MRI confirm it, and your options—from medical therapy to uterus‑sparing procedures and hysterectomy.
Do My Symptoms Mean Adenomyosis or Endometriosis?
Discover the truth about endometriosis and adenomyosis symptoms. Understand how common they really are, and gain insights for effective advocacy.
