Myxedema is extremely rare in children, and guidelines are lacking. We treated a 12‐year‐old girl with myxedema and cardiogenic shock with initial low dose (0.3‐2.5 μg/kg body weight/day) of oral levothyroxine and intensive care. Oral administration may safely revert children's myxedema in a dosage resembling that for hypothyroidism.
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