Diagnostic extended usefulness of RMI: comparison of four risk of malignancy index in preoperative differentiation of borderline ovarian tumors and benign ovarian tumors

Table 1 Schematic presentation of four different RMI score algorithms

Variants	Ultrasound Score (U)^a	Menopausal Score (M)	Tumor Size (S), cm^b
RMI I = U × M × CA-125	U = 0 (0 parameter)	M = 1 (premenopausal)	Not applicable
	U = 1 (1 parameter)	M = 3 (postmenopausal)
	U = 3 (≥2 parameters)
RMI II = U × M × CA-125	U = 1 (0 or 1 parameter)	M = 1 (pre-menopausal)	Not applicable
RMI II = U × M × CA-125	U = 4 (≥2 parameters)	M = 4 (postmenopausal)
RMI III = U × M × CA-125	U = 1 (0 or 1 parameter)	M = 1 (premenopausal)	Not applicable
RMI III = U × M × CA-125	U = 3 (≥2 parameters)	M = 3 (postmenopausal)
RMI IV = U × M × S × CA-125	U = 1 (0 or 1 parameter)	M = 1 (premenopausal)	S = 1 (< 7)
RMI IV = U × M × S × CA-125	U = 4 (≥2 parameters)	M = 4 (postmenopausal)	S = 2 (≥7)

^aParameters: presence of a multilocular cystic lesion, solid areas, a bilateral lesion, ascites, and intra-abdominal metastasis
^bSingle greatest diameter

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