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(a) PCOS: calculation of the S/A ratio. The stromal area corresponds to the hyperechoic zone located mainly in the center of the ovary. The total ovarian area is measured by outlining with the caliper the external limits of the ovary in the maximum plane section. (b) In patients with PCO, the S/A ratio is always >0.34. Those of patients with MFO and healthy controls always fall below this cut-off. Fulghesu et al. [38].
