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Exceptions to the associations found in our study. Three different MS lesions (arrowheads) are shown (left, SWI; right, contrast-enhanced T1-weighted image). A, Hypointense ring pattern on SWI with enhancement in postcontrast image. B, Marked hypointensity pattern on SWI (irregular dots) with enhancement in postcontrast image. C, Mild hypointensity pattern on SWI without enhancement on postcontrast T1-weighted image.
