The case for sonohysterography:

For some time, sonohysterography was considered essential to diagnose endometrial polyps. Until, high resolution ultrasound and endovaginal probes challenged that assumption with stunning images on routine ultrasound scan. These images by Dr. Allen Worrall, Alaska, USA, show an instance, wherein, sonohysterography may well be advisable, to confirm the presence of a doubtful polyp