A 6-year-old girl presented with a history of leg pain and cramping that progressively worsened over a 2- to 3-week period of time. Her examination was notable for normal vital signs, limited range of motion of her left hip, and a limp. Inflammatory markers were slightly elevated, but the serum electrolytes, calcium, and magnesium, complete blood cell count and differential, and creatine kinase level were normal. She was hospitalized for further diagnostic evaluation and was noted to have abnormal muscle movements classified as myokymia (continuous involuntary quivering, rippling, or undulating movement of muscles). Electromyography confirmed the myokymia but did not reveal evidence of a myopathy or neuropathy, prompting additional evaluation for a systemic etiology.
A 6-Year-Old With Leg Cramps
FINANCIAL DISCLOSURE: The authors have indicated they have no financial relationships relevant to this article to disclose.
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Brian P. Jenssen, Andrew J. Lautz, Jennifer L. Orthmann-Murphy, Sabrina W. Yum, Angela Waanders, Elizabeth Fox; A 6-Year-Old With Leg Cramps. Pediatrics October 2015; 136 (4): 732–739. 10.1542/peds.2015-0332
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