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(A–C) Geometric relation of a properly inserted intrauterine device (IUD) to endometrial cavities with various inappropriate fundal transverse dimension. (A) Fundal transverse dimension significantly smaller than the length of the transverse arm of the IUD; (B) fundal transverse dimension significantly greater (initial position of the IUD); (C) fundal transverse dimension significantly greater (possible subsequent position of the IUD).
