PMC6390263_01
(a) Scout X-ray image showing the absence of the right L5-S1 zygapophyseal joint. (b) On axial spine MRI, the right articular process of S1 is absent, with the inferior articular process of the L5 markedly hypoplastic.
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fig1
(a) Coronal cut of spine CT scan showing the absence of the right L5-S1 zygapophyseal joint forming a defect. (b) Sagittal cut of spine CT scan showing the absence of the L5 inferior articular process on the right with normal neighboring joints. (c) Axial CT scan cut of the spine further confirming the absence of the L5-S1 facet joint on the right side.
CRIOR2019-1465460.002.jpg
PMC6390263_01_CRIOR2019-1465460.002.jpg
fig2
CT scan 3D reconstruction shows agenesis of the L5 inferior articular process on the right side with no other related bony abnormalities identified.
CRIOR2019-1465460.003.jpg
PMC6390263_01_CRIOR2019-1465460.003.jpg
fig3