Uterus With Diffuse Adenomyomas

Description

Uterine wall anatomy is presented in section to expose the endometrial cavity and the full thickness of the myometrium affected by diffuse adenomyomas. The endometrium lines the central lumen, while the surrounding myometrium contains multiple ill-defined, variably sized masses dispersed from the inner myometrium near the endometrial–myometrial junction toward the outer myometrium beneath the serosal surface. Orientation along the uterine corpus is apparent, with the fundal region superior to the isthmus and cervix, and the lesions distributed without a single dominant nodule. Boundaries look irregular. Diffuse adenomyosis matters because ectopic endometrial glands and stroma within the myometrium generate hypertrophy and fibrosis, a pattern that often correlates with heavy menstrual bleeding, secondary dysmenorrhea, chronic pelvic pain, and a globally enlarged, tender uterus on bimanual examination. The scattered intramural growth pattern shown here helps differentiate adenomyomas from typical leiomyomas, which are usually well-circumscribed and compress adjacent myometrium, and it parallels the MRI teaching point of a thickened, indistinct junctional zone rather than discrete fibroid margins. Visual separation of the endometrium, inner myometrium, and outer myometrium supports discussion of why symptoms can persist even when the uterine cavity appears unremarkable on hysteroscopy. Gynecologic pathology courses can pair this illustration with histology slides to connect gross pattern to microscopic glands-in-muscle. It also suits OB/GYN teaching decks on abnormal uterine bleeding, preoperative counseling for hysterectomy versus uterus-sparing options, and differential diagnosis with fibroids in infertility and pelvic pain clinics. Anatomical accuracy verified by SciePro's Medical Advisory Board.