Pelvic CT morphometry in Down syndrome: implications for prenatal US evaluation--preliminary results

Area of Science:

• Radiology
• Genetics
• Orthopedics

Background:

• Down syndrome is associated with various congenital anomalies.
• Pelvic morphology can be altered in individuals with chromosomal abnormalities.
• Computed tomography (CT) and ultrasonography (US) are valuable imaging modalities for pelvic assessment.

Purpose of the Study:

• To quantitatively compare pelvic morphometric parameters between patients with and without Down syndrome using CT.
• To identify specific pelvic measurements that could be useful for prenatal ultrasonographic screening in Down syndrome.

Main Methods:

• Retrospective review of pelvic CT scans from 7 patients with Down syndrome and 27 controls.
• Measurement of iliac angle, iliac length, sacroiliac joint angle, and anterior iliac wing separation at multiple sacral levels.
• Statistical analysis to assess the impact of chromosomal status and measurement level on pelvic dimensions.

Main Results:

• Significant differences were observed in mean iliac angle (larger in Down syndrome) and iliac length (shorter in Down syndrome).
• The greatest variations between groups occurred at the middle sacral level.
• No significant differences were found in sacroiliac joint angle or anterior iliac wing separation.

Conclusions:

• Individuals with Down syndrome have characteristic pelvic morphometric differences, specifically a wider iliac angle and shorter iliac length.
• The middle sacral level is identified as optimal for measuring these differentiating pelvic parameters via prenatal ultrasound.