Erratum
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In the October article, “Value and Limitations of Diffusion-Weighted Imaging in Grading and Diagnosis of Pediatric Posterior Fossa Tumors” by Jaremko et al (2010;31:[1613–16](http://www.ajnr.org/lookup/volpage/31/1613)), a study by Koral et al11 was cited as using single-voxel analysis to find minimum tumor apparent diffusion coefficients (ADC). In fact, this study used multi-voxel analysis, but computed ADC directly from source data rather than from archived images.

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