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At
surgery, a widened sulcus was identified (Figure 2) and its relationship to
the underlying tumor was verified by intraoperative ultrasound. The sulcus
was freed of its arachnoid trabeculations and a small incision was made at
the bottom of the sulcus and continued through the white matter to give
access to the tumor. The tumor was broadly attached to the undersurface of
the ependyma. It was relatively avascular except for its central component
which contained numerous elongated flaccid vessels in a spider web
arrangement originating from the ependymal surface. |
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