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20.2 Incision of mastoid and middle ear |
20.21 Incision of mastoid |
20.22 Incision of petrous pyramid air cells |
20.23 Incision of middle ear
Atticotomy
Division of tympanum
Lysis of adhesions of middle ear
Excludes: division of otosclerotic process (19.0)
stapediolysis (19.0)
that with stapedectomy (19.11-19.19) |