Surgery:
o The procedure was performed under general anesthesia.All patients had done surgical exploration and intrasurgical 
signs were recorded.o Tegmen plate (eroded or not)
o Sinus plate (eroded or not, position (normal position or anteriorly displaced))
o Ossicular chain (eroded or not)
o The facial canal (eroded or not, position (normal position or displaced))
o LSCC (eroded or not)
o Involvement of the facial recess and sinus tympani (ST)
o Eustachian tube (ET) involvement
High resolution computed tomography (HRCT) scan of the temporal bone was 
performed with 1 mm sections in both axial and coronal planes and findings were 
recorded and tabulated.o Variable techniques of mastoidectomy were performed according to the 
pathology seen during ear exploration
o The following parameters were compared between CT & intra-operative 
findings:
o Soft tissue lesions including (middle ear, attic & mastoid)
o Mastoid involvement (well pneumatized (cellular), partially pneumatized 
(diploic), not pneumatized (sclerotic))
o Scutum (eroded or not).