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      <h1 class="highwire-cite-title" id="page-title">Mid-Anterior Surface of the Callosal Splenium: Subependymal or Subpial?</h1>  
    	<div class="highwire-cite-authors"><span  class="highwire-citation-authors"><span class="highwire-citation-author first" data-delta="0">Akira Yamamoto</span>, <span class="highwire-citation-author" data-delta="1">Yukio Miki</span>, <span class="highwire-citation-author" data-delta="2">Yasutaka Fushimi</span>, <span class="highwire-citation-author" data-delta="3">Tsutomu Okada</span> and <span class="highwire-citation-author" data-delta="4">Hidekazu Tomimoto</span></span></div>
  
    	<div class="highwire-cite-metadata"><span  class="highwire-cite-metadata-journal highwire-cite-metadata">American Journal of Neuroradiology </span><span  class="highwire-cite-metadata-date highwire-cite-metadata">April 2004,  </span><span  class="highwire-cite-metadata-volume highwire-cite-metadata">25 </span><span  class="highwire-cite-metadata-issue highwire-cite-metadata">(4) </span><span  class="highwire-cite-metadata-pages highwire-cite-metadata">664-665; </span></div>
  
  
  
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<div id="hw-article-author-popups-top-node-10454--6967163589" style="display: none;"><div class="author-tooltip-0"><div class="author-tooltip-name">Akira Yamamoto </div><ul class="author-tooltip-find-more"><li class="author-tooltip-gs-link first"><a href="/lookup/google-scholar?link_type=googlescholar&amp;gs_type=author&amp;author%5B0%5D=Akira%2BYamamoto%2B" target="_blank" class="" data-icon-position="" data-hide-link-title="0">Find this author on Google Scholar</a></li><li class="author-tooltip-pubmed-link"><a href="/lookup/external-ref?access_num=Yamamoto%20A&amp;link_type=AUTHORSEARCH" target="_blank" class="" data-icon-position="" data-hide-link-title="0">Find this author on PubMed</a></li><li class="author-site-search-link last"><a href="/search/author1%3AAkira%2BYamamoto%2B" rel="nofollow" class="" data-icon-position="" data-hide-link-title="0">Search for this author on this site</a></li></ul></div><div class="author-tooltip-1"><div class="author-tooltip-name">Yukio Miki </div><ul class="author-tooltip-find-more"><li class="author-tooltip-gs-link first"><a href="/lookup/google-scholar?link_type=googlescholar&amp;gs_type=author&amp;author%5B0%5D=Yukio%2BMiki%2B" target="_blank" class="" data-icon-position="" data-hide-link-title="0">Find this author on Google Scholar</a></li><li class="author-tooltip-pubmed-link"><a href="/lookup/external-ref?access_num=Miki%20Y&amp;link_type=AUTHORSEARCH" target="_blank" class="" data-icon-position="" data-hide-link-title="0">Find this author on PubMed</a></li><li class="author-site-search-link last"><a href="/search/author1%3AYukio%2BMiki%2B" rel="nofollow" class="" data-icon-position="" data-hide-link-title="0">Search for this author on this site</a></li></ul></div><div class="author-tooltip-2"><div class="author-tooltip-name">Yasutaka Fushimi </div><ul class="author-tooltip-find-more"><li class="author-tooltip-gs-link first"><a href="/lookup/google-scholar?link_type=googlescholar&amp;gs_type=author&amp;author%5B0%5D=Yasutaka%2BFushimi%2B" target="_blank" class="" data-icon-position="" data-hide-link-title="0">Find this author on Google Scholar</a></li><li class="author-tooltip-pubmed-link"><a href="/lookup/external-ref?access_num=Fushimi%20Y&amp;link_type=AUTHORSEARCH" target="_blank" class="" data-icon-position="" data-hide-link-title="0">Find this author on PubMed</a></li><li class="author-site-search-link last"><a href="/search/author1%3AYasutaka%2BFushimi%2B" rel="nofollow" class="" data-icon-position="" data-hide-link-title="0">Search for this author on this site</a></li></ul></div><div class="author-tooltip-3"><div class="author-tooltip-name">Tsutomu Okada </div><ul class="author-tooltip-find-more"><li class="author-tooltip-gs-link first"><a href="/lookup/google-scholar?link_type=googlescholar&amp;gs_type=author&amp;author%5B0%5D=Tsutomu%2BOkada%2B" target="_blank" class="" data-icon-position="" data-hide-link-title="0">Find this author on Google Scholar</a></li><li class="author-tooltip-pubmed-link"><a href="/lookup/external-ref?access_num=Okada%20T&amp;link_type=AUTHORSEARCH" target="_blank" class="" data-icon-position="" data-hide-link-title="0">Find this author on PubMed</a></li><li class="author-site-search-link last"><a href="/search/author1%3ATsutomu%2BOkada%2B" rel="nofollow" class="" data-icon-position="" data-hide-link-title="0">Search for this author on this site</a></li></ul></div><div class="author-tooltip-4"><div class="author-tooltip-name">Hidekazu Tomimoto </div><ul class="author-tooltip-find-more"><li class="author-tooltip-gs-link first"><a href="/lookup/google-scholar?link_type=googlescholar&amp;gs_type=author&amp;author%5B0%5D=Hidekazu%2BTomimoto%2B" target="_blank" class="" data-icon-position="" data-hide-link-title="0">Find this author on Google Scholar</a></li><li class="author-tooltip-pubmed-link"><a href="/lookup/external-ref?access_num=Tomimoto%20H&amp;link_type=AUTHORSEARCH" target="_blank" class="" data-icon-position="" data-hide-link-title="0">Find this author on PubMed</a></li><li class="author-site-search-link last"><a href="/search/author1%3AHidekazu%2BTomimoto%2B" rel="nofollow" class="" data-icon-position="" data-hide-link-title="0">Search for this author on this site</a></li></ul></div></div></div>  </div>

  
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    <div class="highwire-markup"><div xmlns="http://www.w3.org/1999/xhtml" data-highwire-cite-ref-tooltip-instance="highwire_reflinks_tooltip" class="content-block-markup" xmlns:xhtml="http://www.w3.org/1999/xhtml"><div class="article fulltext-view"><span class="highwire-journal-article-marker-start"></span><p id="p-1">We read with interest the recent article by Pekala et al in the <em>AJNR</em> (<a id="xref-ref-1-1" class="xref-bibr" href="#ref-1">1</a>). They described that focal high signal intensity on FLAIR images may be seen in the anterior “subependymal” region of the splenium after radiation therapy or with aging. We would like to point out the following anatomic information that is related to some of the statements made in the article.</p><p id="p-2">The corpus callosum is the largest transverse commissure connecting the cerebral hemispheres. Posteriorly, the corpus callosum is attached with the fornix and hippocampal commissure. On each side, its inferior surface roofs the lateral ventricle, covered by the ependyma (<a id="xref-ref-2-1" class="xref-bibr" href="#ref-2">2</a>).</p><p id="p-3">The velum interpositum is located in the roof of the third ventricle below the body of the fornix. The upper and lower walls of the velum interpositum are formed by two membranous layers of tela choroidea in the roof of the third ventricle. The layer that is attached to the lower surface of the fornix and hippocampal commissure forms the upper wall. The lower wall is attached to the superior surface of the pineal body and tectum posteriorly (<a id="xref-ref-3-1" class="xref-bibr" href="#ref-3">3</a>).</p><p id="p-4">The double layers of pia mater, the tela choroidea, cover the ependymal roof of the third ventricle. The anterior aspect of the tela choroidea is closed at the foramen of Monro, where the pia mater folds on itself. The posterior ends remain open, and between the two ends is cistern of velum interpositum (also known as cistern of the transverse fissure or cistern of the roof of the third ventricle), which abuts on the midanterior surface of the splenium and communicates with the quadrigeminal cistern (<a id="xref-ref-4-1" class="xref-bibr" href="#ref-4">4</a>) (<a id="xref-fig-1-1" class="xref-fig" href="#F1">Fig 1</a>).</p><p id="p-5">In conclusion, the midanterior surface of the callosal splenium abuts on the subarachnoid cistern (cistern of velum interpositum), but not on the ventricles. The correct nomenclature is the anterior “subpial” region of the callosal splenium.</p><p id="p-6">
      
    </p><div id="F1" class="fig pos-float odd"><div class="highwire-figure"><div class="fig-inline-img-wrapper"><div class="fig-inline-img"><a href="http://ajnr-stage2.stage.highwire.org/content/ajnr/25/4/664/F1.large.jpg?width=800&amp;height=600&amp;carousel=1" title="Sagittal (A), axial (B), and coronal (C) MDCT cisternograms showing filling of contrast material in the subarachnoid cisterns and fourth ventricle but not yet in the third and lateral ventricles. Cistern of velum interpositum (arrows) communicates with the quadrigeminal cistern around the internal cerebral veins (arrowhead). The midanterior surface of the callosal splenium abuts on the cistern of velum interpositum, not on the ventricle." class="highwire-fragment fragment-images colorbox-load" rel="gallery-fragment-images-7517712" data-figure-caption="&lt;div class=&quot;highwire-markup&quot;&gt;Sagittal (A), axial (B), and coronal (C) MDCT cisternograms showing filling of contrast material in the subarachnoid cisterns and fourth ventricle but not yet in the third and lateral ventricles. Cistern of velum interpositum (arrows) communicates with the quadrigeminal cistern around the internal cerebral veins (arrowhead). The midanterior surface of the callosal splenium abuts on the cistern of velum interpositum, not on the ventricle.&lt;/div&gt;" data-icon-position="" data-hide-link-title="0"><span class="hw-responsive-img"><img class="highwire-fragment fragment-image lazyload" alt="Fig 1." src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" data-src="http://ajnr-stage2.stage.highwire.org/content/ajnr/25/4/664/F1.medium.gif" width="440" height="139"/><noscript><img class="highwire-fragment fragment-image" alt="Fig 1." src="http://ajnr-stage2.stage.highwire.org/content/ajnr/25/4/664/F1.medium.gif" width="440" height="139"/></noscript></span></a></div></div><ul class="highwire-figure-links inline"><li class="download-fig first"><a href="http://ajnr-stage2.stage.highwire.org/content/ajnr/25/4/664/F1.large.jpg?download=true" class="highwire-figure-link highwire-figure-link-download" title="Download Fig 1." data-icon-position="" data-hide-link-title="0">Download figure</a></li><li class="new-tab"><a href="http://ajnr-stage2.stage.highwire.org/content/ajnr/25/4/664/F1.large.jpg" class="highwire-figure-link highwire-figure-link-newtab" target="_blank" data-icon-position="" data-hide-link-title="0">Open in new tab</a></li><li class="download-ppt last"><a href="/highwire/powerpoint/31646" class="highwire-figure-link highwire-figure-link-ppt" data-icon-position="" data-hide-link-title="0">Download powerpoint</a></li></ul></div><div class="fig-caption" xmlns:xhtml="http://www.w3.org/1999/xhtml"><span class="fig-label">F<span class="sc">ig</span> 1.</span> <p id="p-7" class="first-child">Sagittal (<em>A</em>), axial (<em>B</em>), and coronal (<em>C</em>) MDCT cisternograms showing filling of contrast material in the subarachnoid cisterns and fourth ventricle but not yet in the third and lateral ventricles. Cistern of velum interpositum (<em>arrows</em>) communicates with the quadrigeminal cistern around the internal cerebral veins (<em>arrowhead</em>). The midanterior surface of the callosal splenium abuts on the cistern of velum interpositum, not on the ventricle.</p><div class="sb-div caption-clear"></div></div></div><div class="section ref-list" id="ref-list-1"><h2>References</h2><ol class="cit-list"><li><a class="rev-xref-ref" href="#xref-ref-1-1" title="View reference 1 in text" id="ref-1">↵</a><div class="cit ref-cit ref-other" id="cit-25.4.664.1"><div class="cit-metadata"><cite>Pekala JS, Mamourian AC, Wishart HA, et al. <strong>Focal lesion in the splenium of the corpus callosum on FLAIR MR images: a common finding with aging and after brain radiation therapy.</strong> <span class="cit-source">AJNR Am J Neuroradiol</span> <span class="cit-pub-date">2003</span>;<span class="cit-vol">24</span>:<span class="cit-fpage">855</span>–861</cite></div><div class="cit-extra"><a href="/lookup/ijlink/YTozOntzOjQ6InBhdGgiO3M6MTQ6Ii9sb29rdXAvaWpsaW5rIjtzOjU6InF1ZXJ5IjthOjQ6e3M6ODoibGlua1R5cGUiO3M6NDoiQUJTVCI7czoxMToiam91cm5hbENvZGUiO3M6NDoiYWpuciI7czo1OiJyZXNpZCI7czo4OiIyNC81Lzg1NSI7czo0OiJhdG9tIjtzOjE5OiIvYWpuci8yNS80LzY2NC5hdG9tIjt9czo4OiJmcmFnbWVudCI7czowOiIiO30=" class="cit-ref-sprinkles cit-ref-sprinkles-ijlink"><span><span class="cit-reflinks-abstract">Abstract</span><span class="cit-sep cit-reflinks-variant-name-sep">/</span><span class="cit-reflinks-full-text"><span class="free-full-text">FREE </span>Full Text</span></span></a></div></div></li><li><a class="rev-xref-ref" href="#xref-ref-2-1" title="View reference 2 in text" id="ref-2">↵</a><div class="cit ref-cit ref-other" id="cit-25.4.664.2"><div class="cit-metadata"><cite>Pearson C. <strong>Cerebral cortex.</strong> In: Williams PL, Bannister LH, Berry MM, et al, eds. <span class="cit-source">Gray’s Anatomy.</span> 38th ed. London: Churchill Livingstone;<span class="cit-pub-date">1995</span> :<span class="cit-fpage">1141</span>–1186</cite></div><div class="cit-extra"></div></div></li><li><a class="rev-xref-ref" href="#xref-ref-3-1" title="View reference 3 in text" id="ref-3">↵</a><div class="cit ref-cit ref-other" id="cit-25.4.664.3"><div class="cit-metadata"><cite>Rhoton AL Jr. <strong>Microsurgical anatomy of the lateral ventricles.</strong> In: Wilkins RH, Rengachary SS, eds. <span class="cit-source">Neurosurgery.</span> 2nd ed. New York: McGraw-Hill;<span class="cit-pub-date">1996</span> :<span class="cit-fpage">1419</span>–1434</cite></div><div class="cit-extra"></div></div></li><li><a class="rev-xref-ref" href="#xref-ref-4-1" title="View reference 4 in text" id="ref-4">↵</a><div class="cit ref-cit ref-other" id="cit-25.4.664.4"><div class="cit-metadata"><cite>Spiegel SM, Nixon B, TerBrugge K, et al. <strong>Arachnoid cyst of the velum interpositum.</strong> <span class="cit-source">AJNR Am J Neuroradiol</span> <span class="cit-pub-date">1988</span>;<span class="cit-vol">9</span>:<span class="cit-fpage">981</span>–983</cite></div><div class="cit-extra"><a href="/lookup/ijlink/YTozOntzOjQ6InBhdGgiO3M6MTQ6Ii9sb29rdXAvaWpsaW5rIjtzOjU6InF1ZXJ5IjthOjQ6e3M6ODoibGlua1R5cGUiO3M6MzoiUERGIjtzOjExOiJqb3VybmFsQ29kZSI7czo0OiJham5yIjtzOjU6InJlc2lkIjtzOjc6IjkvNS85ODEiO3M6NDoiYXRvbSI7czoxOToiL2FqbnIvMjUvNC82NjQuYXRvbSI7fXM6ODoiZnJhZ21lbnQiO3M6MDoiIjt9" class="cit-ref-sprinkles cit-ref-sprinkles-ijlink"><span><span class="cit-reflinks-full-text"><span class="free-full-text">FREE </span>Full Text</span></span></a></div></div></li></ol></div><ul class="copyright-statement"><li class="fn" id="copyright-statement-1">Copyright © American Society of Neuroradiology</li></ul><span class="highwire-journal-article-marker-end"></span></div><span class="related-urls"></span></div></div>  </div>

  
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        	<div class="highwire-cite-metadata"><span  class="highwire-cite-metadata-volume highwire-cite-metadata">Vol. 25</span>, <span  class="highwire-cite-metadata-issue highwire-cite-metadata">Issue 4 </span><div  class="highwire-cite-metadata-pubdate highwire-cite-metadata">1 Apr 2004 </div></div>
      
      
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    	<div class="highwire-cite-authors"><span  class="highwire-citation-authors"><span class="highwire-citation-author first" data-delta="0"><span class="nlm-given-names">Akira</span> <span class="nlm-surname">Yamamoto</span></span>, <span class="highwire-citation-author" data-delta="1"><span class="nlm-given-names">Yukio</span> <span class="nlm-surname">Miki</span></span>, <span class="highwire-citation-author" data-delta="2"><span class="nlm-given-names">Yasutaka</span> <span class="nlm-surname">Fushimi</span></span>, <span class="highwire-citation-author" data-delta="3"><span class="nlm-given-names">Tsutomu</span> <span class="nlm-surname">Okada</span></span>, <span class="highwire-citation-author" data-delta="4"><span class="nlm-given-names">Hidekazu</span> <span class="nlm-surname">Tomimoto</span></span></span></div>
  
    	<div class="highwire-cite-metadata"><span  class="highwire-cite-metadata-journal highwire-cite-metadata">American Journal of Neuroradiology </span><span  class="highwire-cite-metadata-date highwire-cite-metadata">Apr 2004, </span><span  class="highwire-cite-metadata-volume highwire-cite-metadata">25 </span><span  class="highwire-cite-metadata-issue highwire-cite-metadata">(4) </span><span  class="highwire-cite-metadata-pages highwire-cite-metadata">664-665; </span></div>
  
  
  
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    	<div class="highwire-cite-authors"><span  class="highwire-citation-authors"><span class="highwire-citation-author first" data-delta="0"><span class="nlm-given-names">Akira</span> <span class="nlm-surname">Yamamoto</span></span>, <span class="highwire-citation-author" data-delta="1"><span class="nlm-given-names">Yukio</span> <span class="nlm-surname">Miki</span></span>, <span class="highwire-citation-author" data-delta="2"><span class="nlm-given-names">Yasutaka</span> <span class="nlm-surname">Fushimi</span></span>, <span class="highwire-citation-author" data-delta="3"><span class="nlm-given-names">Tsutomu</span> <span class="nlm-surname">Okada</span></span>, <span class="highwire-citation-author" data-delta="4"><span class="nlm-given-names">Hidekazu</span> <span class="nlm-surname">Tomimoto</span></span></span></div>
  
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