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Clip1:

Left mastoidectomy is done; semicircular canals are exposed.

'Bill's island' of bone over the sigmoid sinus is seen inferiorly.

Clip2:

Labyinthectomy is in process; Internal auditory meatus is deroofed after identifying and protecting the labyrinthine segment of the facial nerve.

Clip3:

the tumor is dissected off the facial nerve

Clip4:

Further exposure of the tumor which is excised in piecemeal. Tumor bed is seen after tumor excision.