Studying 61 cases of tympanogenous labyrinthitis (1927-1938) the author has concluded as follows.
When meningitis developes from the labyrinthitis secondary to acute or subacute otitis media, it happens for the most part in the manifest stadium of labyrinthitis and occasionally after a radical operation of mid-ear.
The labyrinthitis of cholesteatomatous origin, especially after a lapse of manifest stadium, is not so dangerous when a radical operation is undertaken.