Table I.
Clinical data.
| Contralateral ear | |||
| Normal | 79 (56%) | ||
| Chronic otitis | 61 (44%) | ||
| Tympanic membrane | |||
| Normal | 12 (8%) | Posterior attical retraction | 9 (7%) |
| Atelectasis | 13 (9%) | Anterior attical retraction | 10 (8%) |
| Posterior perforation | 12 (8%) | Total attical retraction | 10 (8%) |
| Subtotal perforation | 7 (5%) | Posterior pars tensa retraction | 67 (47%) |
| Pathogenesis | Cholesteatoma extension | ||
| Congenital | 12 (9%) | Atrium | 59 (42%) |
| Migration | 16 (11%) | Atrium- atticus | 53 (38%) |
| Retraction | 112 (80%) | Atrium-atticus-antrum | 28 (20%) |
| Other lesions | |||
| None | 117 (83%) | Cochlea | 1 (1%) |
| HSC | 4 (3%) | Facial nerve | 8 (6%) |
| SSC | 1 (1%) | HSC-Facial nerve | 9 (6%) |