Fig 1. Terminal myelocystocele.

A, 30-week fetal sonography, sagittal spine view, shows a large cystic mass (arrows) arising from distal tip of sacrum.

B, Axial view shows a single internal septation (arrow). The mass is contiguous with skin (dashed arrow).

C, T2-weighted neonatal spine MR image shows that the cystic mass communicates with the spinal canal (arrow).

D, Same view as C shows that cord is distended, dysmorphic, and tethered to the mass (arrows).

E and F, Preoperative image of the terminal myelocystocele (E), with transillumination (F).

G, Intraoperative view shows terminal dilation of central canal (arrow)—septation seen on sonography was this cyst wall.

H, Intraoperative view shows spinal canal and tethered cord (arrow).