Sonographic and clinical features of adenomyosis in women in "early" (18-35) and "advanced" (>35) reproductive ages

Adenomyosis has been considered for a long time a condition of advanced reproductive age. Recently, imaging techniques have allowed its diagnosis in young women. The aim of our study was to compare adenomyosis in early (18-35) and advanced (>35) reproductive age (ERA vs. ARA).Between May 2019 and October 2020, 928 consecutive women underwent transvaginal ultrasounds (TV-US) in our Department. We enrolled 134 women of reproductive age (18-55) presenting at least 2 US features of adenomyosis, according to the MUSA consensus. We compared the two reproductive age groups (ERA and ARA) about both clinical and US features of adenomyosis.Severe dysmenorrhea was more frequent in the ERA group (78.7% vs. 54.8%), while menorrhagia was more frequent in the ARA group (64.4% vs. 37.7%). At US, the ARA group had a higher frequency of altered junctional zone (67.1% vs. 39.3%), diffuse (76.7% vs. 39.3%) and severe adenomyosis (24.7% vs. 9.8%), and adenomyoma (16.4% vs. 1.6%).Adenomyosis may occur in young women, who present different clinical and sonographic features compared to older women. Young patients have a higher prevalence of severe dysmenorrhea and focal and mild adenomyosis at US, while older women present more frequently menorrhagia, and altered junctional zone, diffuse and severe adenomyosis at US. Early diagnosis in young women suffering from adenomyosis may help to interrupt the mechanisms that drive the development of adenomyosis, starting immediately the right treatment.