Polypoid endometriosis (PE) is a rare variant of benign endometriosis and may mimic malignant tumors. MR manifestations of five women with pathologically proven PE were retrospectively evaluated. PE was associated with pelvic endometriosis (4/5) with “black rim sign” (3/5), and with adenomyosis (5/5). PE showed high intensity on T2WI (5/5), high intensity hemorrhagic foci on T1WI (3/5), hemorrhagic signal voids on susceptibility-weighted sequences (2/2), high intensity on DWI (4/4) with relatively high ADC values (mean, 1.67 x 10-3 mm2/s), gradually increasing time-intensity curve pattern on DCE-MRI (4/4) with intense contrast-enhancement (4/5) or weak contrast-enhancement (1/5, with malignant transformation).
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