[Necrotizing osteitis of tympanal bone. Report of 2 cases]

A large variety of process can cause necrosis of the bony external ear canal, found by means otoscopic examination. Two cases with a final diagnosis or external ear canal cholesteatoma are reported. A revision of the main characteristics of this uncommon entity is performed, with a special emphasis to avoid that the scarcity of clinic symptoms favour its growing in depth.