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Intraoperative sagittal (A) and axial (B) ultrasound images demonstrating the arachnoid web (arrows) and compressed spinal cord (asterisks). Intraoperative microscope image (C) after dural opening revealing the thickened arachnoid membranes from the dura to the pia over the spinal cord. Intraoperative sagittal (D) and axial (E) ultrasound images after removal of the arachnoid web. Sample of the extracted arachnoid web (F) that was sent for pathology.
