Article Figures & Data
Figures
- fig 1.
Three-dimensional CT reconstruction of the skull base seen from above shows large defects in the base of the left middle and posterior cranial fossa. The left mandibular condyle is seen through the bony defect (arrow)
- fig 2.
Coronal CT through the madibular condyles and craniocervical junction.
A, Coronal CT through the mandibular condyles shows a normal right temporomandibular joint, and aplasia of the floor of the left middle cranial fossa and glenoid fossa. The left mandibular ramus and condyle are small but otherwise normal. The left mandibular condyle projects into the middle cranial fossa (arrow) and articulates with the base of the temporal lobe.
B, Coronal CT through the craniocervical junction shows absence of the left arch of C1, with the lateral mass of C2 articulating with the skull base (arrow). The right arch of C1 is fused to the occipital condyle (arrowhead), resulting in a focal right convex curve at the craniocervical junction.
- fig 3.
T1-weighted 550/10/2 (TR/TE/excitations) sagittal MR image through the craniocervical junction shows a Chiari I malformation with a 17-mm cerebellar tonsilar descent and a syrinx at the C2–C3 level (arrow)
