Doctors in Shanghai on Tuesday were considering surgery options for a 2-month-old boy born with an unusually well-formed third arm.
Neither of the boy's two left arms is fully functional and tests have so far been unable to determine which was more developed, said Dr. Chen Bochang, head of the orthopedics department at Shanghai Children's Medical Center.
"His case is quite peculiar. We have no record of any child with such a complete third arm," Chen said in a telephone interview.
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