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Charles M. Poser, MD, FRCP

	Since this article does not have an abstract, we have provided the first 150 words of the full text and any section headings.

The recent article by de Seze et al¹ correctly identifies a set of clinical signs and symptoms that may be useful in differentiating acute disseminated encephalomyelitis (DEM) from the first episode of multiple sclerosis (MS). However, their contention that DEM may evolve or convert to MS implies that the 2 conditions are, if not identical, at least closely related. In fact, they differ in at least 2 ways. Multiple sclerosis occurs in people who are genetically vulnerable, a feature noticeably lacking in DEM. Even more importantly, ever since Robert Carswell and Jean Cruveilhier published their classic illustrations of MS almost 200 years ago, the sharp edges of the typical MS lesion—so aptly described by Ludo van Bogaert as découpées à l’emporte-pièce—have been recognized by neuropathologists of the caliber of Ivan Bertrand, Jean Gruner, and François Lhermitte, to name just a few, as pathognomonic for . . . [Full Text of this Article]

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