Absent septum pellucidum
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An absent septum pellucidum may rarely be an isolated finding, or more commonly be seen in association with a variety of conditions.
Epidemiology
The septum pellucidum is partly or entirely absent in 2 or 3 individuals per 100,000 in the general population.
Pathology
An absent septum pellucidum may be developmental or acquired secondary to another pathological process 1,2.
Cavum septum pellucidum is always visualised between 18 and 37 weeks and within a biparietal diameter of 44 to 88 mm. Failure to detect the cavum septum pellucidum within this time interval requires further investigation; however the absence of cavum septum pellucidum on the ultrasound exam prior to 18 weeks, or later than 37 weeks, is considered a normal finding.
Developmental
- isolated
- corpus callosum agenesis
- holoprosencephaly
- AVID syndrome
-
septo-optic dysplasia
/absent septum pellucidum
Acquired
-
aqueductal stenosiscausing -
Chiari II malformationcausing congenital hydrocephalus - hydranencephaly
- porencephaly
Radiographic features
Besides the nonNon-visualisation of the septum pellucidum with direct communication of the frontal horns. Additionally the following characteristics may be seen 3:
- boxing/squaring off of the frontal horns
- inferior pointing frontal horns
- abnormally inferiorly positioned fornix (coronal views)
-<p>An <strong>absent septum pellucidum</strong> may rarely be an isolated finding, or more commonly be seen in association with a variety of conditions.</p><h4>Epidemiology</h4><p>The septum pellucidum is partly or entirely absent in 2 or 3 individuals per 100,000 in the general population. </p><h4>Pathology</h4><p>An absent septum pellucidum may be developmental or acquired secondary to another pathological process <sup>1,2</sup>. </p><p><a href="/articles/cavum-septum-pellucidum-3">Cavum septum pellucidum</a> is always visualised between 18 and 37 weeks and within a biparietal diameter of 44 to 88 mm. Failure to detect the cavum septum pellucidum within this time interval requires further investigation; however the absence of cavum septum pellucidum on the ultrasound exam prior to 18 weeks, or later than 37 weeks, is considered a normal finding</p><h5>Developmental</h5><ul>- +<p>An <strong>absent septum pellucidum</strong> may rarely be an isolated finding, or more commonly be seen in association with a variety of conditions.</p><h4>Epidemiology</h4><p>The septum pellucidum is partly or entirely absent in 2 or 3 individuals per 100,000 in the general population. </p><h4>Pathology</h4><p>An absent septum pellucidum may be developmental or acquired secondary to another pathological process <sup>1,2</sup>. </p><p><a href="/articles/cavum-septum-pellucidum-3">Cavum septum pellucidum</a> is always visualised between 18 and 37 weeks and within a biparietal diameter of 44 to 88 mm. Failure to detect the cavum septum pellucidum within this time interval requires further investigation; however the absence of cavum septum pellucidum on the ultrasound exam prior to 18 weeks, or later than 37 weeks, is considered a normal finding.</p><h5>Developmental</h5><ul>
- +<li>isolated </li>
-<li><a href="/articles/holoprosencephaly">holoprosencephaly</a></li>-<li><a href="/articles/schizencephaly">schizencephaly</a></li>-<a href="/articles/septo-optic-dysplasia-1">septo-optic dysplasia</a> / <a title="Absent septum pellucidum" href="/articles/absent-septum-pellucidum">absent septum pellucidum</a>- +<a href="/articles/holoprosencephaly">holoprosencephaly</a><ul>
- +<li><a title="Alobar holoprosencephaly" href="/articles/alobar-holoprosencephaly">alobar</a></li>
- +<li><a title="Semilobar holoprosencephaly" href="/articles/semilobar-holoprosencephaly-2">semilobar</a></li>
- +<li><a title="Lobar holoprosencephaly" href="/articles/lobar-holoprosencephaly">lobar</a></li>
- +<li><a title="Middle interhemispheric variant of holoprosencephaly" href="/articles/syntelencephaly">middle interhemispheric variant</a></li>
- +</ul>
- +<li><a title="AVID" href="/articles/avid">AVID syndrome</a></li>
- +<li><a href="/articles/septo-optic-dysplasia-1">septo-optic dysplasia</a></li>
-<li>-<a href="/articles/aqueduct-stenosis">aqueductal stenosis</a> causing <a href="/articles/fetal-hydrocephalus">congenital hydrocephalus</a>-</li>-<li>-<a href="/articles/chiari-ii-malformation">Chiari II malformation</a> causing congenital hydrocephalus</li>- +<li><a href="/articles/fetal-hydrocephalus">congenital hydrocephalus</a></li>
-</ul><h4>Radiographic features</h4><p>Besides the non-visualisation of the <a href="/articles/septum-pellucidum">septum pellucidum</a> the following characteristics may be seen <sup>3</sup>:</p><ul>- +</ul><h4>Radiographic features</h4><p>Non-visualisation of the <a href="/articles/septum-pellucidum">septum pellucidum</a> with direct communication of the frontal horns. Additionally the following characteristics may be seen <sup>3</sup>:</p><ul>
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