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AJNR - American Journal of Neuroradiology

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American Journal of Neuroradiology 26:912-914, April 2005
© 2005 American Society of Neuroradiology

Case Report
INTERVENTIONAL

Angiographic Evidence of Aneurysm Neck Healing Following Endovascular Treatment with Bioactive Coils

Nestor R. Gonzalez^a, Aman B. Patel^c, Yuichi Murayama^b and Fernando Viñuela^b

^a Division of Neurosurgery, UCLA Medical Center, Los Angeles, CA
^b Division of Interventional Neuroradiology, UCLA Medical Center, Los Angeles, CA
^c Division of Endovascular Neurosurgery/Interventional Neuroradiology, Mount Sinai School of Medicine, New York, NY

Address correspondence to Nestor R. Gonzalez, MD, Division of Neurosurgery, UCLA Medical Center, 10833 Le Conte Avenue, Room 18-228, Los Angeles, CA

Summary: A new angiographic finding in intracranial aneurysms embolized with Matrix coils is described. Two illustrative cases with a well-defined radiolucent separation between the coil mass and the parent artery are presented. To the best of our knowledge, this is the first report in humans of this finding. On the basis of prior histopathologic studies, this finding, which we call the "white-collar sign," may indicate the formation of a thick connective tissue barrier between aneurysm and artery that prevents any further aneurysmal filling.

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