Spontaneous regression of an aneurysm at a nonbranching site of the supraclinoid internal carotid artery

Case report

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✓ The authors report on a patient who had presented with a subarachnoid hemorrhage whose bleeding source was not revealed on initial angiography, although subsequent studies disclosed a saccular aneurysm at a nonbranching site of the left internal carotid artery (ICA). The aneurysm could have been caused spontaneously or after blunt head trauma. The patient was supportively observed given the considerable risks associated with aggressive treatments. The present case represents the first involving spontaneous complete regression of an aneurysm at a nonbranching site of the supraclinoid ICA.

Article Information

Address reprint requests to: Takashi Ueta, M.D., Department of Neurosurgery, Japanese Red Cross Medical Center, 4–1–22, Hiroo, Shibuya-ku, Tokyo 150–8935, Japan. email: ueta-tky@umin.ac.jp.

© AANS, except where prohibited by US copyright law.

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Figures

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    Left: Initial CT scan revealing SAH. Right: Digital subtraction angiogram obtained on the day of presentation, demon- strating no apparent abnormality.

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    A three-dimensional CT angiogram (left) and a DS angiogram (right) obtained 6 and 12 days after presentation, respectively, demonstrating an aneurysm at a nonbranching site of the left supraclinoid ICA.

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    A follow-up DS angiogram obtained 19 days after pre- sentation, demonstrating partial obliteration of the aneurysm.

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    A follow-up DS angiogram obtained 47 days after pre- sentation, exhibiting complete regression of the aneurysm.

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