Terminal Myelocystocele and Sacrococcygeal Teratoma: A Comparison of Fetal Ultrasound Presentation and Perinatal Risk
J.A. Yua,
R. Sohaeyb,
A.M. Kennedyd and
N.R. Seldenc
a From the School of Medicine Oregon Health & Science University, Portland, Ore
b Departments of Diagnostic Radiology, Oregon Health & Science University, Portland, Ore
c Neurological Surgery, Oregon Health & Science University, Portland, Ore
d Department of Radiology, University of Utah, College of Medicine, Salt Lake City, Utah
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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).
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Fig 2. Type 2 SCT in a 28-week fetus.
A, Coronal sonography view shows cystic mass (arrows) arising from the tip of the sacrum (dashed arrow).
B, Axial view shows internal septation (arrow).
C, T2-weighted fetal MR image, coronal view, shows a cystic mass (arrows) and a significant intracorporeal solid component (dashed arrows).
D, T2-weighted fetal MR image, sagittal view, confirms intracorporeal extension (dashed arrows). The internal septation (black arrow) seen by sonography is part of the mass, not an extension of the spinal canal (white arrow points to tip of high-signal-intensity CSF in spinal canal).
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