Giant Fibroepithelial Stromal Polyp of the Vulva: Diffusion-Weighted and Conventional Magnetic Resonance Imaging Features and Pathologic Correlation

Abstract Background Fibroepithelial stromal polyp (FESP) is a rare benign mass, usually presenting at the vagina. Here we report the first case of contrast-enhanced magnetic resonance imaging (CE-MRI) with diffusion-weighted images (DWI) of a giant vulvar FESP and compare the MRI features with the histopathologic results. Case A 14-year-old girl presented with a huge mass as large as 20 cm that originated from the labium majora. Preoperative MRI showed a polypoid mass consisting of a central stalk and surrounding stroma. Different signal intensities on MRI were correlated with various histopathologic features. The mass was cured by complete excision without remnant lesion. Summary and Conclusion CE-MRI with DWI can help us differentiate FESP from other vulvovaginal stromal tumors with a complete evaluation of the external and internal structures and the depth of invasion.