Is a 7cm lipoleiomyoma posterior to uterus in 40 year old pre menopausal woman concerning? have read more common in post menopause, not causing symptoms?

There is nothing to concern if it is asymptomatic. It is more common in perimenopausal and postmenopausal women because the leiomyoma begins to degenerate at this time and fatty degeneration is seen, hence the name lipoleiomyoma. The prevalence of leiomyoma increases with age during the reproductive years and this benign tumor usually shrinks will degenerate (shrink) in postmenopausal years.