the salient features include good exposure as in open-cavity tympanomastoidectomy , maintenance and widening of the middle ear space by bony bridge retention and facial buttress sculpturing to enhance grafting and ossiculoplasty such as torp or porp as in canal-up tympanomastoidectomy , and enhancement of mastoid obliteration for large cavities by blocking the aditus with bone pate or cartilage and by providing a separation between middle ear and mastoid .
C0198161
tympanomastoidectomy
C0446908
mastoid