Diffuse vs focal adenomyosis: what’s the difference?

Diffuse adenomyosis means adenomyosis is spread throughout much of the uterine muscle (myometrium), which can cause a more globally enlarged, tender uterus and is often linked with heavy or prolonged bleeding. Focal adenomyosis is confined to one area and may form a discrete mass called an adenomyoma, which can mimic a fibroid on symptoms and imaging.

We typically distinguish these patterns using ultrasound and/or MRI: diffuse disease tends to look like widespread thickening and texture changes across the myometrium, while focal disease appears as a more localized, defined region. This difference matters because a single focal lesion may be more amenable to targeted, uterus-sparing surgery, whereas diffuse involvement can make complete removal without weakening the uterus more challenging. If you’re trying to preserve fertility or weigh surgical options, our team can review your imaging and symptoms to help clarify the pattern and the safest path forward.