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Ultrasound examination revealed an enlarged heterogeneous thyroid gland. Four weeks after treatment with atenolol and methimazole, his strength and cognition began to improve. This case highlights the importance of evaluating for potentially reversible toxic-metabolic etiologies in children presenting with any progressive neurologic symptoms.<\/jats:p>","DOI":"10.1542\/peds.2023-064093","type":"journal-article","created":{"date-parts":[[2024,8,2]],"date-time":"2024-08-02T08:06:18Z","timestamp":1722585978000},"source":"Crossref","is-referenced-by-count":0,"title":["A Reversible Etiology of Progressive Motor Decline in a Previously Healthy Child"],"prefix":"10.1542","volume":"154","author":[{"given":"Tal","family":"Eliav","sequence":"first","affiliation":[{"name":"Department of Pediatrics, Guerin Children\u2019s at Cedars-Sinai Medical Center, Los Angeles, California"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Deandra","family":"Kuruppu","sequence":"additional","affiliation":[{"name":"Department of Pediatrics, Guerin Children\u2019s at Cedars-Sinai Medical Center, Los Angeles, 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