Article Figures & Data
Figures
- FIG 1.
A patient with Chiari I with 19 HIF up to 3 mm in diameter, 1 AMF, no AMF>HIF, and an SL of various hyperintensity and diameter from C4 through T1, consistent with hydromyelia.
- FIG 2.
Postdecompressive craniectomy patient with Chiari I with 9 HIF, 4 AMFs, 1 AMF>HIF, and sharp and hyperintense SLs at C6–C7 and less hyperintense, sharp, and defined SLs at C2–C6.
- FIG 3.
Control patient with 15 HIF, 3 AMFs, 3 AMF>HIF, and SL with variably hyperintense and variably sharp dots and dashes from C3–4 to C7. Note hyperintense pixels immediately anterior to the AMF on axial images, despite crescentic flow-related signal loss immediately anterior to the cord on most images.
- FIG 4.
Postoperative patient with Chiari I with 19 HIF, 3 AMFs, and 2 AMF>HIF, with a faintly hyperintense ventral line at C6–T1.
Tables
- Table 1:
Age, sex, incidence (%), and frequency (No./Pt), for HIF, AMF, SL, and AMF>HIF in the Chiari I and non-Chiari I control groups
Age (Median) Sex (F) (%) HIF (%) HIF/Pt. AMF (%) AMF/Pt. SL (No.) (%) AMF>HIF (Mean) Chiari I (n = 25) 40 23 (92%) 25 (100%) 8.5a 24 (96%) 4.0b 14c (56%) 2.2 Control (n = 25) 40 17 (68%) 24 (96%) 3.9a 22 (88%) 2.7b 7c (28%) 1.0 - Table 2:
Incidence HIF and AMF/pt., SL incidence, and number of AMFs extending to HIF (AMF>HIF) in Chiari I without an operation versus patients having undergone postdecompressive craniectomy
HIF AMF SL AMF>HIF % HIF/Pt. % AMF/Pt. No. (%) No. Chiari I no surgery (n = 15) 100 8.9 100 4.0 5 (33%)a 1.9b Chiari I post-op (n = 10) 100 8.1 90 4.3 8 (80%)a 2.8b - Table 3:
Number patients, HIF/pt., AMF/pt., HIF to AMF ratio, and AMF>HIF/pt. in HIF or AMF-only, HIF+AMF, and AMF>HIF subgroups for all Chiari I and control groups, with and without SL
No. HIF/Pt. AMF/Pt. Ratio AMF>HIF All Chiari I 25 8.6 4.1 2.1 2.2 All control 25 3.9 2.7 1.4 1 All Chiari I and controls HIF only Chiari I 1 7 NA NA 2.3 Control 1 12 NA NA 1.0 AMF only 0 NA NA NA NA HIF+AMF Chiari I 24 8.6 4.3 2.0 2.1 Control 23 3.9 3 1.3 1.1 AMF-HIF Chiari I 22 7.9 4.7 1.7 2.5 Control 16 4.4 3.3 1.3 1.5 No AMF→HIF Chiari I 3 13.7 1.7 8.2 0 Control 9 3 1.7 1.8 0 SL Chiari I 14 10.1 4.6 2.2 2.9 Control 7 7 3.4 2.1 1.3 HIF+AMF Chiari I 14 10.1 4.6 2.2 2.2 Control 6 6.2 4 1.6 1.5 AMF-HIF Chiari I 12 8.6 5 1.7 2.9 Control 5 7.2 4 1.8 1.8 No SL Chiari I 11 6.6 3.5 1.9 1.9 Control 18 2.7 2.4 1.1 0.8 HIF+AMF Chiari I 11 6.8 3.9 1.7 2.1 Control 17 2.9 3 0.9 0.9 AMF-HIF Chiari I 9 7 4.2 1.7 2.2 Control 11 3.1 3 1.1 1.2 Note:—NA indicates not applicable.
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