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Figure 12a. Decidual changes of adenomyosis in a 23-year-old woman with a hydatidiform mole. (a) Sagittal T2-weighted image shows an ill-defined lesion of heterogeneous high signal intensity in the posterior myometrium (arrows) in addition to a lesion in the uterine cavity (arrowheads). (b) Sagittal T2-weighted image obtained after suction and curettage shows that the lesion in the posterior myometrium is reduced in volume and signal intensity and now has the typical appearance of adenomyosis (arrows). The lesion in the uterine cavity was confirmed to be a hydatidiform mole. This case seems to represent decidual changes of adenomyosis because the serum level of human chorionic gonadotropin was highly elevated when the lesion demonstrated prominent high signal intensity in a.