The underlined portion, "An expert in organ transplants", is known as an: appositive.
What is an Appositive?
An appositive can be described as a noun, noun phrase, pronoun, or pronoun phrase which is set aside another noun or pronoun to provide more information about about the noun or pronoun.
For example, the noun in question here is "the surgeon". The underlined portion of the sentence, "An expert in organ transplants" (noun phrase), provides us more information about the "surgeon".
Therefore, the underlined portion, "An expert in organ transplants", is known as an: appositive.
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