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A rare developmental variant of the atlas
European Journal of Radiology
|February 1, 1985
Summary
Uncommon congenital anomalies of the atlas arch, including clefts, can mimic fractures. Radiologists must recognize these rare atlas bone variations to ensure accurate diagnosis and avoid misinterpretation.
Area of Science:
- Radiology
- Anatomical variations
- Congenital abnormalities
Background:
- Congenital anomalies of the atlas (C1 vertebra) posterior arch are rare.
- These anomalies, particularly clefts, can be misdiagnosed as fractures.
- Awareness among radiologists is crucial for accurate interpretation.
Observation:
- A unique case involving aplasia of the right posterior arch of the atlas is presented.
- This resulted in a wide, asymmetric medial cleft.
- Additionally, hypoplasia of the left posterior arch with a lateral cleft due to a secondary ossification center was observed.
Findings:
- The presented case exhibits a rare combination of atlas posterior arch anomalies.
- This includes right-sided aplasia and left-sided hypoplasia with a secondary ossification center.
- This specific combination has not been previously documented in medical literature.
Implications:
- Accurate identification of these congenital atlas anomalies is essential for differential diagnosis.
- Radiologists need to be aware of these variations to prevent misdiagnosis as traumatic injury.
- Understanding these rare anatomical variations contributes to the broader knowledge of craniovertebral junction development.