Prenatal Sonographic and MRI Assessment of Early Fetal Neck Immature Teratoma

We report a case of a pregnancy involving a fetal neck mass which was diagnosed at 19 weeks of gestation. Three dimensional ultrasound provided detailed additional information about the extent of the lesion and the areas of involvement. Color Doppler revealed intense vascularity within the lesion, with both arterial and venous flow. Fetal MRI revealed the exact extent of the lesion along with deep seated structures involved. Diffusion weighted images revealed restricted diffusion with low ADC values suggesting a mitotic etiology. The patient along with her husband decided to abort the fetus. An infantogram of the abortus was taken. Histopathology and immunohistochemistry was performed. The final diagnosis was immature teratoma.