Neuroradiology 18, 55-57 (1980) Neuroradiolng!l © by Springer-Verlag 1980 Membrane Stain in Chronic Subdural Hematoma: A Rare Angiographic Sign A Case Report A. J. Kumar, M. Koslow and A. E. George Departments of Radiology and Neurosurgery, New York University Medical Center, New York, USA Fig. 1 a-e. Right common carotid angiogram, a Frontal projection. The anterior cerebral artery is markedly shifted to the left. The Sylvian point is displaced inferiorly. Some middle cerebral artery convexity branches are displaced from the inner table (closed arrow heads) describing an outward concavity. Avascular zone is present in the high convexity region (open arrow), b Lateral pro- jection; arterial phase. The Sylvian triangle is inferiorly displaced (arrows). c Lateral projection; late venous phase. A crescentic stain produced by the chronic subdural hematoma is demonstrated (arrows) 0028-3940/80/0019/0055/$01.00