We report a case of a 39 year-old man initially presenting with thyrotoxic hypokalemic periodic paralysis who later complained of painful enlargement of the right breast.

• 摘要我们报告一例39岁男性，初步呈现甲状腺机能亢进低钾周期性麻痹，后来抱怨右侧乳房扩大疼痛。