title: Steroid-responsive recurrent encephalopathy associated with subacute thyroiditis.
abstract: BACKGROUND
  Steroid-responsive encephalopathy associated with subacute thyroiditis has, to our knowledge, not been reported previously.
  
  
  METHODS
  A 49-year-old woman was found collapsed and brought to our institution with decreased mentality, dysarthria, and gait disturbance. Brain magnetic resonance imaging and angiography were normal but blood tests revealed thyroid-autoantibody-negative thyrotoxicosis. Results of a (99m)technetium-pertechnetate scan were compatible with the thyrotoxic phase of subacute thyroiditis. 14-3-3 proteins were detected in cerebrospinal fluid. Her mental status began to improve from the day following steroid administration. Recurrent encephalopathy was found 2 months after the initial admission, which was also effectively treated with steroid.
  
  
  CONCLUSIONS
  We speculate that steroid-responsive recurrent encephalopathy associated with subacute thyroiditis is a subtype of Hashimoto's encephalopathy, and consider that steroid treatment should not be delayed in suspected patients.
authors.affiliation: Division of Endocrinology, Department of Internal Medicine, Chung-Ang University College of Medicine, Seoul, Korea.
authors.forename: Yun Jae
authors.initials: YJ
authors.lastname: Chung
authors.forename: Kwang-Yeol
authors.initials: KY
authors.lastname: Park
authors.forename: Jihyun
authors.initials: J
authors.lastname: Ahn
authors.forename: Sam-Yeol
authors.initials: SY
authors.lastname: Ha
authors.forename: Young Chul
authors.initials: YC
authors.lastname: Youn