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AJR 2001; 177:709-712
© American Roentgen Ray Society

Original Report

Diffusion-Weighted MR Imaging of Rim-Enhancing Brain Masses

Is Markedly Decreased Water Diffusion Specific For Brain Abscess?

Glenn A. Tung1, Peter Evangelista1, Jeffrey M. Rogg1 and John A. Duncan, III2

1 Department of Diagnostic Imaging, Brown University School of Medicine, Rhode Island Hospital, 593 Eddy St., Providence, RI 02903.
2 Department of Neurosurgery, Brown University School of Medicine, Rhode Island Hospital, Providence, RI 02903.

OBJECTIVE. This retrospective study investigated the specificity of restricted water diffusion for the diagnosis of brain abscess. Two of five rim-enhancing brain masses with restricted water diffusion (apparent diffusion coefficient of 0.79 [10-3 mm2/sec] or less) were brain abscesses, but diagnoses in the other cases were metastatic squamous cell carcinoma (two cases) and radiation necrosis.

CONCLUSION. Although an important diagnostic sign, restricted water diffusion is not specific for brain abscess.


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