Chronic suppurative otitis media presents a variety of forms with a multiplicity of symptoms. In some, the discharge is so profuse as to run out of the external meatus; in others, it is so scant that the patient is unaware that he has a discharging ear. In some, the discharge is thin and mucus-like; in others, it is thick and purulent. Sometimes there is an offensive odor that is hardly appreciably altered by cleansing antiseptic local treatment. In other cases, the discharge is free from an offensive odor, or what odor there is may be quickly dispelled by appropriate local treatment. The perforation in the membrana tympani may be confined to the pars tensa, or it may be restricted to the pars flaccida. In some, the perforation may be confined to the membrane itself—the so-called central type of perforation. In others, the destruction of the membrane may extend