{Reference Type}: Case Reports {Title}: Ultrasound features of osseous metaplasia of the endometrium-Case series and review of the literature. {Author}: Grigore M;Pristavu A;Gafitanu D; {Journal}: Clin Imaging {Volume}: 52 {Issue}: 0 {Year}: Nov 2018 0 {Factor}: 2.42 {DOI}: 10.1016/j.clinimag.2018.08.006 {Abstract}: Osseous metaplasia of the endometrium is a rare condition characterized by abnormal bone formation in the uterine endometrium. The osseous fragments act like a foreign body in the uterine cavity; thus, infertility, menstrual abnormalities, pelvic pain dysmenorrhea, and dyspareunia are commonly associated. We present a case series of four women with osseous metaplasia of the endometrium with different symptomatology. Two-dimensional endovaginal examination played a primary role in the diagnosis, the characteristic ultrasound pattern being hyperechoic linear or irregular areas within the endometrium casting posterior acoustic shadowing. Three-dimensional ultrasound better demonstrated the irregular appearance and clearly differentiated the oseous metaplasia from an intrauterine device.