Source:http://linkedlifedata.com/resource/umls/id/C0003571
MSH: Excision of the apical portion of a tooth through an opening made in the overlying labial, buccal, or palatal alveolar bone. (Dorland, 28th ed),NCI: Excision of the apex of the petrous portion of the temporal bone.,NCI: Excision of the apical portion of a tooth root through an opening made in the overlying labial, buccal, lingual, or palatal alveolar bone.