- Perforation of the tympanic membrane alone without evidence of other disease.
- Conductive hearing loss with intact tympanic membrane.
- Tympanic membrane perforation with disease confined to the middle ear and tympanum.
- Attic cholesteatoma.
- Disease involving the middle ear, epitympanum, and mastoid without cholesteatoma.
- Disease involving the middle ear, epitympanum, and mastoid with cholesteatoma.
Reference:
Pulec, J. L., & Deguine, C. (1995). Classification of chronic suppurative otitis media. Operative Techniques in Otolaryngology-Head and Neck Surgery, 6(1), 2-4. doi:10.1016/s1043-1810(95)80003-4