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Letter to the Editor| Volume 345, ISSUE 1-2, P262-264, October 15, 2014

Uhthoff's phenomena and brain MRI suggesting demyelinating lesions: RIS or CIS? A case report

      Uhthoff's phenomenon (UP) is a stereotyped, brief disturbance in neurological functioning triggered by any increase in core body temperature (CBT) [
      • Frohman T.C.
      • Davis S.L.
      • Beh S.
      • Greenberg B.M.
      • Remington G.
      • Frohman E.M.
      Uhthoff's phenomena in MS—clinical features and pathophysiology.
      ]. It is related to recurrent fluctuations in neuronal conduction of demyelinated axons, being a feature of multiple sclerosis (MS) [
      • Frohman T.C.
      • Davis S.L.
      • Beh S.
      • Greenberg B.M.
      • Remington G.
      • Frohman E.M.
      Uhthoff's phenomena in MS—clinical features and pathophysiology.
      ]. Radiologically isolated syndrome (RIS) has been defined by Okuda [
      • Okuda D.T.
      • Mowry E.M.
      • Beheshtian A.
      • Waubant E.
      • Baranzini S.E.
      • Goodin D.S.
      • et al.
      Incidental MRI anomalies suggestive of multiple sclerosis: the radiologically isolated syndrome. Neurology 2009; 72: 800–805. Erratum.
      ] as an incidental MRI finding of central nervous system (CNS) white matter anomalies suggestive of MS (according to Barkhof's criteria for dissemination in space), with no historical accounts of remitting neurological symptoms, no related-disability and no other better explanation (e.g. substance abuse, medical condition, cerebrovascular disease). We describe a case with transient and recurrent oscillopsia, interpreted as UP, with MRI suggesting demyelinating lesions.
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