microsurgery
From Longman Dictionary of Contemporary Englishmicrosurgerymi‧cro‧sur‧ge‧ry /ˈmaɪkrəʊˌsɜːdʒəri $ -kroʊˌsɜːr-/ noun [uncountable] medical treatment in which a part of someone’s body is repaired or removed using very small instruments or lasersExamples from the Corpusmicrosurgery• The Stoke Mandeville Burns Unit built on these and later added microsurgery.• He is the first doctor in Britain to successfully attempt the three-step microsurgery.