You seem to have grounds for a malpractice case, since at least one of the following occured--1) The doctor did not inform you as to what surgery was being done, and so did not get your consent; or2) The doctor deliberately did not do the surgery you agreed to; or3) The doctor carelessly failed to complete the surgery or make sure he had removed everything.Any of the above would be malpractice (provision of medical care that does not meet accepted standards for care). It would be worth your while to consult with a medical malpractice lawyer; many such attorneys provide a free initial consultation to evaluate a claim, and you could confirm that prior to making the appointment.