endometrial stromal nodule

the endometrial stromal nodule is a benign tumor composed of differentiated endometrial stromal cells arranged as a well circumscribed nodule with smooth non-invasive margins. they are rare neoplasms, diagnosed in most instances by microscopy. although nodules are benign in nature, hysterectomy is the treatment of choice to enable evaluation of the tumor margins which are well demarcated in endometrial stromal nodule and infiltrative in low grade endometrial stromal sarcoma. we present here a case of a 46 year old female with history of menorrhagia and a preoperative clinical diagnosis of uterine leiomyoma followed by a definitive diagnosis of endometrial stromal nodule. experience with endometrial stromal nodule is limited, hence we emphasize on the fact that these are rare and benign tumours which should be distinguished from other invasive malignant stromal tumors with a more sinister prognostic course.