Congenital epulis: prenatal ultrasonographic and postnatal MR features with pathologic correlation

On prenatal ultrasonogram, a fetus was found to have a protruding mass in the oral cavity. Postnatal magnetic resonance imaging (MRI) revealed the mass to have 2 components: a main portion exhibiting isointensity on T1- and T2-weighted images with mild contrast enhancement and a contrast-enhancing rim showing T1 isointensity and T2 hyperintensity. Histologic examination revealed a congenital granular cell tumor with prominent peripheral vessels.