We do not currently know of any antonyms for Frey's procedure.
The noun Frey's procedure is defined as:
A surgicaltechnique, used in the treatment of chronicpancreatitis, in which the diseased portions of the pancreas head are cored out. A lateralpancreaticojejunostomy is then performed in which a loop of the jejunum is then mobilized and attached over the exposed pancreatic duct to allow better drainage.