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The first validation of this was by hysterography. (18, 19, 32) Hasson designed Wing Sound I to be able to measure the functional uterine cavity length, (7) and later showed that IUDs which were placed 1.25-1.75cm above the lower endometrial cavity gave the best results.
Hysterography suggested that in some circumstances IUDs may be unsuitable because of non conformity with the endometrial cavity.
Uterine geometry by Wing sound and hysterography versus direct measurements.
The size and shape of the uterine cavity determined by hysterography with an intrauterine contraceptive marker.
In addition, a postoperative hysterography and curetting biopsy revealed no mass lesion, making a uterine primary unlikely.