Tegmentovermian angle
Updates to Article Attributes
Title
was changed:
Body
was changed:
The Tegmento-vermiantegmentovermian angle is an important measurable parameter in the assessment of posterior fossa abnormalities in the fetus. The angle is constructed on midsagittal images of the fetal brain, ideally on MRI.
The angle is formed by the intersection of the following two lines 1:
- line 1: along the dorsal surface of the brain stem parallel to the tegmentum and which should transect the nucleus gracilis at the obex.
- line 2: along the ventral surface of the vermis.
Normally the angle is close to 0 degrees° and an elevated angle is often associated with posterior fossa malformations 1,2.:
- Dandy-Walker malformation: >45°
-
Vermianvermian hypoplasia: 18-45° - Blake's pouch cyst: 8-45°
-
Mega misternamega cisterna magna: <18° -
Arachnoidarachnoid cyst: 0°
-<p>The <strong>Tegmento-vermian angle</strong> is an important measurable parameter in the assessment of posterior fossa abnormalities in the fetus. The angle is constructed on midsagittal images of the fetal brain, ideally on MRI.</p><p>The angle is formed by the intersection of the following two lines <sup>1</sup>:</p><ul>- +<p>The <strong>tegmentovermian angle</strong> is an important measurable parameter in the assessment of posterior fossa abnormalities in the fetus. The angle is constructed on midsagittal images of the fetal brain, ideally on MRI.</p><p>The angle is formed by the intersection of the following two lines <sup>1</sup>:</p><ul>
-<strong>line 1:</strong> along the dorsal surface of the brain stem parallel to the tegmentum and which should transect the nucleus gracilis at the <a title="Obex" href="/articles/obex">obex</a>.</li>- +<strong>line 1:</strong> along the dorsal surface of the brain stem parallel to the tegmentum and which should transect the nucleus gracilis at the <a href="/articles/obex">obex</a>.</li>
-</ul><p>Normally the angle is close to 0 degrees and an elevated angle is often associated with posterior fossa malformations <sup>1,2</sup>.</p><ul>- +</ul><p>Normally the angle is close to 0° and an elevated angle is often associated with posterior fossa malformations <sup>1,2</sup>:</p><ul>
-<a href="/articles/isolated-inferior-vermian-hypoplasia">Vermian hypoplasia</a>: 18-45°</li>- +<a href="/articles/isolated-inferior-vermian-hypoplasia">vermian hypoplasia</a>: 18-45°</li>
-<a href="/articles/mega-cisterna-magna-1">Mega misterna magna</a>: <18°</li>- +<a href="/articles/mega-cisterna-magna-1">mega cisterna magna</a>: <18°</li>
-<a href="/articles/arachnoid-cyst-fetal-presentation-1">Arachnoid cyst</a>: 0°</li>- +<a href="/articles/arachnoid-cyst-fetal-presentation-1">arachnoid cyst</a>: 0°</li>