What does “heterogeneous myometrium” mean on imaging?

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.