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Am J Ophthalmol. 2001 May;131(5):676-7.

Vascular compression as a cause of superior oblique myokymia disclosed by thin-slice magnetic resonance imaging.

Author information

1
Department of Ophthalmology, Sapporo Medical University, School of Medicine, Sapporo, Hokkaido, Japan.

Abstract

PURPOSE:

To describe a case of superior oblique myokymia in which thin-slice magnetic resonance imaging (MRI) appeared to show vascular compression of the trochlear nerve.

METHODS:

A 50-year-old woman presented with episodic monocular oscillopsia. Neuro-ophthalmologic examinations showed intermittent intorsional microtremor of her right eye, diagnosed as right superior oblique myokymia. Thin-slice (1.6 mm) MRI, using spoiled gradient recalled acquisition in the steady state, was employed to examine the trochlear nerve in its course through the ambient cistern.

RESULTS:

Imaging disclosed a branch of the posterior cerebral artery immediately adjacent to the right trochlear nerve.

CONCLUSION:

These magnetic resonance findings suggest that a cause of superior oblique myokymia may be vascular compression of the trunk of the trochlear nerve.

PMID:
11336957
[Indexed for MEDLINE]

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