A 50-year-old woman with right-sided OEC. The tumor appears as a mainly cystic mass with a large mural nodule. The cystic component (crossstar) shows slight hyperintensity on axial T1WI (a), homogeneous hyperintensity on axial T2WI with fat suppression (b), no enhancement on contrast-enhanced T1WI with fat suppression (c), isointensity on DWI (d). The mural nodule (arrow) demonstrates isointensity (a), heterogenous hyperintensity (b), marked enhancement (c) and hyperintensity (d) with an ADC value of 1.030 × 10−3 mm2/s, respectively. Synchronous uterine endometrial carcinoma (arrowhead) shows mild enhancement on contrast-enhanced T1WI and hyperintensity on DWI.