Depends: Depends on what you mean by "challenging"? Neurosurgery is commonly referred as challenging due to the risks involved, but elective plastic surgery may be considered "challenging" due to the patients involved. Surgical oncology may be "challenging" as well due to definitive removal of tumors but keeping healthy tissue intact. Opthomalogist have to deal with microscopic nerves in the eye.
Answered 6/10/2013
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