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AJNR - American Journal of Neuroradiology

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American Journal of Neuroradiology 24:962-964, May 2003
© 2003 American Society of Neuroradiology

Case Report
BRAIN

Demonstration of an Actively Bleeding Aneurysm by CT Angiography

Andrei I. Holodny^a,c, Jeffrey Farkas^a, Richard Schlenk^b and Allan Maniker^b

^a Department of Radiology, UMDNJ—New Jersey Medical School, Newark, NJ
^b Department of Neurosurgery, UMDNJ—New Jersey Medical School, Newark, NJ
^c Department of Radiology, Memorial Sloan-Kettering Cancer Center, New York, NY

Address correspondence and reprint requests to Andrei I. Holodny, M.D., Department of Radiology, Memorial Sloan-Kettering Cancer Center, 1275 York Avenue, New York, NY 10021

Summary: We describe a case of an actively bleeding aneurysm demonstrated by CT angiography (CTA). The active hemorrhage was characterized by a nebulous attenuation in the subarachnoid space adjacent to the aneurysm. The measurements (HU) of the hemorrhage were equal to or slightly less than those of the contrast material in the arteries and diminished as one moved further from the aneurysm. As CTA is used more frequently in the diagnosis of cerebral aneurysms, it is important to understand imaging features of this potentially lethal condition.