Angulation and Dimension of the Sphenoid Ridge in Chiari Malformation Type 2

Area of Science:

• Neurosurgery
• Radiology
• Pediatric Imaging

Background:

• Chiari malformation type 2 (CMT2) is a complex congenital brain abnormality.
• Sphenoid ridge (SR) morphology plays a role in cranial base development.
• Understanding SR variations in CMT2 can offer insights into associated neurodevelopmental changes.

Purpose of the Study:

• To investigate and quantify differences in sphenoid ridge (SR) morphology between pediatric patients with Chiari malformation type 2 (CMT2) and healthy controls.
• To determine if specific SR morphometric parameters correlate with the presence of CMT2.

Main Methods:

• A retrospective analysis of pediatric computed tomography (CT) images was performed.
• Fifty patients diagnosed with CMT2 and 50 age- and sex-matched controls were included.
• Key SR measurements included length (L-SR) and angle (A-SR), along with various width parameters (LW-SR, MPW-SR, MLW-SR).

Main Results:

• Patients with CMT2 demonstrated a statistically significant reduction in sphenoid ridge length (L-SR) compared to controls (P = 0.008).
• No significant differences were found in sphenoid ridge angle (A-SR) or width measurements (MPW-SR, LW-SR, MLW-SR) between the CMT2 group and controls.
• The distribution of different sphenoid ridge angle types (A, B, C) did not significantly correlate with the presence of CMT2 (P = 0.175).

Conclusions:

• The findings suggest that CMT2 is associated with a narrower anterior cranial fossa, as indicated by reduced L-SR.
• Middle fossa depth, potentially represented by A-SR, appears to be unaffected in CMT2 patients.
• Sphenoid ridge morphology, particularly L-SR, may serve as a valuable imaging biomarker in the assessment of CMT2.