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Arch Ophthalmol. 1998;116:798.

	Since this article does not have an abstract, we have provided the first 150 words of the full text and any section headings.

THE MANAGEMENT of neurologically isolated, nontraumatic oculomotor nerve palsy is a challenge in the wise deployment of expensive and potentially harmful diagnostic tools.

Most cases are caused by ischemia of the nerve and do not require any diagnostic tests.^1-5 Others are caused by inflammatory or neoplastic meningitis that can be diagnosed with a combination of magnetic resonance imaging and lumbar puncture. But some patients harbor a cerebral aneurysm that could kill them within days and for which timely treatment is curative. In the past, the diagnosis of aneurysm has depended entirely on catheter cerebral angiography, a test that maims or kills in about 1% to 2% of cases, and perhaps more among the elderly and those with ample arteriosclerotic risk factors.⁶

A recent alternative is magnetic resonance angiography (MRA), a variant of magnetic resonance imaging that highlights blood vessels. Entirely free of complications, it detects more than 95% of cerebral . . . [Full Text of this Article]

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