Diagnostic ultrasound ( PDFDrive )

CHAPTER 35 The Fetal Spine 1219
L1
S3
S1
A B C
FIG. 35.2 Spine Ossiication at 11 Weeks + 4 Days’ Menstrual Age. (A) Ossiication of neural processes extends from C1 to L1 (arrow).
The neural process ossiication starts at the base of the transverse process, which lies at the junction of the pedicle and the lamina. (B) Spine
ossiication at 13 weeks’ menstrual age. Ossiication extends to level S1 neural process (S1 arrow) and S3 vertebral body (S3 arrow). (C) Spine
ossiication at 15 weeks + 2 days’ menstrual age. Ossiication now extends into the laminae of the vertebral arches in the thoracic and lumbar
spine. Arrows demonstrate ossiication of the laminae at levels L1 and L3. Ossiication of the laminae is minimal at S1.
P
P
L
L
A
B
FIG. 35.3 Spine Ossiication on Radiographs at 14 Weeks’ Gestation. (A) Anteroposterior and (B) lateral radiographs. Well-developed ossiication
in the centra now extends down to level S3. Ossiication in the lumbar neural processes extends into the lamina (L) and pedicles (P). The neural
process ossiication starts to resemble the shape of the cartilaginous neural process rather than the focal dotlike ossiication at 13 weeks’
gestation.