Osseous metaplasia of endometrium: An unusual cause of secondary infertility.

Osseous metaplasia of the endometrium is a rare entity in which there is presence of mature or immature bone tissue in the endometrium. It is a rare disorder that usually leads to secondary infertility and is frequently associated with recurrent miscarriages and can be rarely asymptomatic. We present the case of a patient with endometrial ossification associated with secondary infertility. The patient presented with excessive vaginal discharge and was undergoing evaluation for secondary infertility. Transvaginal sonography showed a hyperechoic elongated lesion in the endometrium suggestive of endometrial calcification with posterior acoustic shadowing. Diagnostic hysteroscopy was done and the endometrial cavity showed multiple white-colored, solid, fan-shaped structures and bony spicules all over the endometrium, which were removed with a hysteroscopic grasper and sent for histopathological examination (HPE). The HPE confirmed the presence of bony trabeculae along with secretory endometrial glands. There have only been a few cases of endometrial osseous metaplasia reported in India and it is usually an overlooked cause of infertility. Although rare, we should consider this as a probable cause of secondary infertility when the characteristic ultrasound features are visualized and that hysteroscopic resection is the gold standard treatment.