The tegmento-vermian angle is constructed on sagittal midline images of the fetal brain. It is the angle formed by lines along the anterior surface of the vermis and the dorsal surface of the brainstem. The angle should be close to zero. Large angles indicate elevation of the vermis due to the following:
- Developmental arrest of the vermis,
- Failure of fenestration of the fourth ventricle with subsequent elevation of the vermis, or
- Persistent Blake pouch cyst: The vermis will be normal.
References
Robinson AJ, Blaser S, Toi A, Chitayat D, Halliday W, Pantazi S, Gundogan M, Laughlin S, Ryan G. The fetal cerebellar vermis: assessment for abnormal development by ultrasonography and magnetic resonance imaging. Ultrasound Q. 2007 Sep;23(3):211-23.
The tegmento-vermian angle is constructed on sagittal midline images of the fetal brain. It is the angle formed by lines along the anterior surface of the vermis and the dorsal surface of the brainstem. The angle should be close to zero. Large angles indicate elevation of the vermis due to the following:
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