It should show as a dismissal. Expungement is a separate procedure, but it won't help you since the end result of an expungement is a dismissal and you have that already.
The only thing I can think of to remove the misdemeanor from your record (aside from a governor's pardon) is a sealing on the basis of factual innocence. Those, however, require meeting a very high standard -- so high, in my experience, that it is rarely granted.
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