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MR Diagnosis of Myxomatous Aneurysms: Report of Two Cases

Paolo G.P. Nuciforaa and William P. Dillona

a From the Department of Radiology, University of California, San Francisco.



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  		FIG 1. A 75-year-old woman with a history of melanoma and resected atrial myxoma.

A–C, Axial T1-weighted (600/18/2 [TR/TE/excitations]) postcontrast MR images demonstrate several enhancing foci within the subarachnoid space (arrowheads), consistent with aneurysms of the right middle cerebral artery.

D, Coronal postcontrast T1-weighted MR image (600/15/1) demonstrates contrast-enhancing aneurysm of the right middle cerebral artery (arrowhead) and left posterior parietal arteries (arrow).

E, Axial T2-weighted (3000/80/1) MR image. The aneurysm demonstrates a low signal intensity flow void, consistent with a patent aneurysm.

F, Digital subtraction angiography (DSA), anteroposterior view, of the right internal carotid artery demonstrates multiple arterial dilatations, the largest of which is located in the angular branch of the right middle cerebral artery.

G, DSA, lateral view, of the right internal carotid artery demonstrates multiple fusiform aneurysms in the distribution of the right middle cerebral artery. T1-weighted postcontrast image (600/15/1) demonstrates an enhancing left middle cerebral aneurysm (white arrow) and an area of low signal intensity suggestive of old infarction (arrowheads).



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  		FIG 2. A 73-year-old woman with a history of multiple strokes and resected cardiac myxoma.

A, Axial proton density–weighted (2800/40/1) image demonstrates a low signal intensity flow void consistent with a patent aneurysm in the pericallosal artery (white arrow). An area of increased signal intensity is consistent with old infarction (black arrows).

B, Axial T1-weighted (600/20/1) postcontrast image reveals enhancement of multiple fusiform lesions surrounded by regions of low signal intensity, consistent with myxomatous aneurysms (arrows).

C, Coronal T1-weighted postcontrast image (600/15/1) demonstrates an enhancing left middle cerebral aneurysm (white arrow) and an area of low signal intensity suggestive of old infarction (arrowheads).





Copyright © 2009 by the American Society of Neuroradiology. Print ISSN: 0195-6108 Online ISSN: 1936-959X