Crista Galli Morphology in Patients With Trisomy 21: A Computed Tomography-Based Analysis

Area of Science:

• Anatomy
• Genetics
• Radiology

Background:

• Trisomy 21 (T21), also known as Down syndrome, is a genetic disorder associated with various craniofacial anomalies.
• The crista galli (CG), a bony projection of the ethmoid bone, is a key structure of the skull base.

Purpose of the Study:

• To investigate and compare the morphological characteristics of the crista galli (CG) between individuals with T21 and healthy controls.
• To identify potential differences in CG dimensions, shape, and pneumatization patterns.

Main Methods:

• Analysis of computed tomography (CT) scans from 41 patients with T21 and 47 healthy controls.
• Measurement of CG length (CG-L), width (CG-W), and height (CG-H).
• Qualitative evaluation of CG shape and pneumatization patterns.

Main Results:

• Crista galli length (CG-L) was significantly shorter in the T21 group compared to controls (P=0.001).
• CG shape distribution differed significantly, with the ossified type more prevalent in T21 and the teardrop type more common in controls (P=0.012).
• CG height and width were comparable between groups; pneumatization was not significantly associated with T21.

Conclusions:

• Trisomy 21 is associated with specific differences in crista galli length and shape.
• Understanding these craniofacial variations can enhance knowledge of cranial base development in T21.
• Identifying characteristic anatomical features may aid clinical practice and diagnosis.