Removal of head of Malleus and body of Incus
or Incus completely with dislocation of Incudo-stapedial joint and removal of scutum was done for C1b cholesteatoma (medial attic).
Incus was intact in 6 (5.9%) patients, lenticular process erosion was observed in 3 (2.9%) patients, long process of incus was necrosed in 81 (79.4%) patients and body of incus
was destroyed in 12 (11.8%) patients.
Among the ossicles, the long process of incus, stapes crura, body of incus
and manubrium are involved in that order of frequency.
There is a good correlation between erosion of malleus and body of incus
with intraoperative findings, although long process of incus and stapes could not reliably be detected by HRCT.