Dorsal Thoracic Arachnoid Web and the “Scalpel Sign”: A Distinct Clinical-Radiologic Entity

From the Neuroradiology Division, Department of Radiology (M.A.R., P.R., K.C.-B., S.M., J.A.M., M.W.) and Department of Neurosurgery (J.S.S., C.-P.Y., M.E.S., C.I.S.), University of Virginia, Charlottesville, Virginia; and Department of Radiology (R.R.L.), Veterans Administration San Diego Healthcare System and University of California, San Diego, San Diego, California.

From the Neuroradiology Division, Department of Radiology (M.A.R., P.R., K.C.-B., S.M., J.A.M., M.W.) and Department of Neurosurgery (J.S.S., C.-P.Y., M.E.S., C.I.S.), University of Virginia, Charlottesville, Virginia; and Department of Radiology (R.R.L.), Veterans Administration San Diego Healthcare System and University of California, San Diego, San Diego, California.

From the Neuroradiology Division, Department of Radiology (M.A.R., P.R., K.C.-B., S.M., J.A.M., M.W.) and Department of Neurosurgery (J.S.S., C.-P.Y., M.E.S., C.I.S.), University of Virginia, Charlottesville, Virginia; and Department of Radiology (R.R.L.), Veterans Administration San Diego Healthcare System and University of California, San Diego, San Diego, California.

From the Neuroradiology Division, Department of Radiology (M.A.R., P.R., K.C.-B., S.M., J.A.M., M.W.) and Department of Neurosurgery (J.S.S., C.-P.Y., M.E.S., C.I.S.), University of Virginia, Charlottesville, Virginia; and Department of Radiology (R.R.L.), Veterans Administration San Diego Healthcare System and University of California, San Diego, San Diego, California.

From the Neuroradiology Division, Department of Radiology (M.A.R., P.R., K.C.-B., S.M., J.A.M., M.W.) and Department of Neurosurgery (J.S.S., C.-P.Y., M.E.S., C.I.S.), University of Virginia, Charlottesville, Virginia; and Department of Radiology (R.R.L.), Veterans Administration San Diego Healthcare System and University of California, San Diego, San Diego, California.

From the Neuroradiology Division, Department of Radiology (M.A.R., P.R., K.C.-B., S.M., J.A.M., M.W.) and Department of Neurosurgery (J.S.S., C.-P.Y., M.E.S., C.I.S.), University of Virginia, Charlottesville, Virginia; and Department of Radiology (R.R.L.), Veterans Administration San Diego Healthcare System and University of California, San Diego, San Diego, California.

From the Neuroradiology Division, Department of Radiology (M.A.R., P.R., K.C.-B., S.M., J.A.M., M.W.) and Department of Neurosurgery (J.S.S., C.-P.Y., M.E.S., C.I.S.), University of Virginia, Charlottesville, Virginia; and Department of Radiology (R.R.L.), Veterans Administration San Diego Healthcare System and University of California, San Diego, San Diego, California.

From the Neuroradiology Division, Department of Radiology (M.A.R., P.R., K.C.-B., S.M., J.A.M., M.W.) and Department of Neurosurgery (J.S.S., C.-P.Y., M.E.S., C.I.S.), University of Virginia, Charlottesville, Virginia; and Department of Radiology (R.R.L.), Veterans Administration San Diego Healthcare System and University of California, San Diego, San Diego, California.

From the Neuroradiology Division, Department of Radiology (M.A.R., P.R., K.C.-B., S.M., J.A.M., M.W.) and Department of Neurosurgery (J.S.S., C.-P.Y., M.E.S., C.I.S.), University of Virginia, Charlottesville, Virginia; and Department of Radiology (R.R.L.), Veterans Administration San Diego Healthcare System and University of California, San Diego, San Diego, California.

From the Neuroradiology Division, Department of Radiology (M.A.R., P.R., K.C.-B., S.M., J.A.M., M.W.) and Department of Neurosurgery (J.S.S., C.-P.Y., M.E.S., C.I.S.), University of Virginia, Charlottesville, Virginia; and Department of Radiology (R.R.L.), Veterans Administration San Diego Healthcare System and University of California, San Diego, San Diego, California.

From the Neuroradiology Division, Department of Radiology (M.A.R., P.R., K.C.-B., S.M., J.A.M., M.W.) and Department of Neurosurgery (J.S.S., C.-P.Y., M.E.S., C.I.S.), University of Virginia, Charlottesville, Virginia; and Department of Radiology (R.R.L.), Veterans Administration San Diego Healthcare System and University of California, San Diego, San Diego, California.