[en] With the progress in diagnostic imaging techniques, the preoperative diagnostic technique for lesion in the pelvic cavity has become comparatively easy and its clinical usefulness is in high estimation. However, in case of an atypical lesion, it is not always easy to recognize the original organ by traditional imaging pattern. In the present report two cases of colossal hematometra in old women which presented a cystic lesion pattern are dealt with and discussed from a point of medical imagings for diagnosis. (author)