Predominately cystic exophytic sacrococcygeal teratoma at 30 weeks gestation

(A) Ultrasound image of the distal spine shows a mass (arrow) extending off the caudal end of the fetus.
(B) Color Doppler image shows predominantly cystic nature of the tumor with very little flow.
(C) Fetal magnetic resonance image shows a small portion of intrapelvic extent (arrows).