Adenomyosis is a condition where the cells of the lining of the womb (endometrium) are found in the muscle wall of the womb (myometrium). Around one in 10 women will have adenomyosis. It can occur in any woman who still has periods but is most common in women aged 40-50 and
https://www.guysandstthomas.nhs.uk/resources/patient-information/gynaecology/adenomyosis.pdf