Decidualized adenomyosis: MR imaging findings including diffusion-weighted imaging

We evaluated the MR imaging findings including DWI with ADC measurement of five decidualized adenomyosis (DA): 4 were during pregnancy, and 1 was under hormonal therapy. All DAs were demonstrated as heterogeneous signal intensity on T2WI containing prominent bright foci reflecting decidual reaction of endometrium within adenomyosis. On DWI the decidualized endometrial foci showed high signal intensity. The mean ADC of 4 DAs was 1.62 +/- 0.05, which was significantly higher than that of 14 malignant uterine myometrial tumors (0.85 +/- 0.15) (p=0.003). We conclude that ADC measurement may be helpful in distinguishing DA from malignant uterine tumors.

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