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Medical Mystery: What caused boy’s sudden extreme muscle weakness?

A previously healthy 11-year-old Asian boy came into the ER with leg pains and muscle weakness after a soccer game. He could hardly stand and his parents had to carry him into the exam room.

A previously healthy 11-year-old Asian boy came into the ER with leg pains and muscle weakness after a soccer game. He could hardly stand and his parents had to carry him into the exam room.
A previously healthy 11-year-old Asian boy came into the ER with leg pains and muscle weakness after a soccer game. He could hardly stand and his parents had to carry him into the exam room.Read moreGetty Images