Developmental abnormalities of the cervical spine below the axis

Area of Science:

• Orthopedic Surgery
• Radiology
• Developmental Biology

Background:

• Cervical spine anomalies are frequently encountered in clinical practice.
• Significant anomalies predominantly affect the upper cervical spine: occiput, atlas (C1), and axis (C2).
• Lower cervical spine anomalies can present as isolated findings or part of a syndrome.

Purpose of the Study:

• To delineate the common locations and presentations of clinically significant cervical spine anomalies.
• To differentiate between localized and syndromic anomalies below the axis.
• To enhance understanding of Klippel-Feil syndrome's characteristics.

Main Methods:

• Review of radiological and clinical data pertaining to cervical spine anomalies.
• Classification of anomalies based on location (occiput, atlas, axis, below axis).
• Analysis of anomaly patterns: solitary vs. widespread segmentation/ossification defects.

Main Results:

• Most clinically relevant cervical spine anomalies are concentrated in the occipital, atlas, and axis regions.
• Anomalies below the axis can manifest as solitary lesions mimicking other diseases.
• Widespread segmentation and ossification anomalies below the axis characterize Klippel-Feil syndrome.

Conclusions:

• The upper cervical spine is the primary site for significant anomalies.
• Lower cervical spine anomalies require careful evaluation to distinguish isolated findings from Klippel-Feil syndrome.
• Accurate classification aids in diagnosis and management of cervical spine abnormalities.