[Hyperplasia of the coronoid processes of the mandible--case-history].

Hyperplasia of the coronoid processes of the mandible in a 36-year-old man was associated, in addition to difficult opening of the mouth, with noises of apparently articular origin. The noise was due to the shifting of the coronoid processes along the inner surfaces of the temporal processes of the facial bones. On the X-ray picture also the elongated styloid processes were striking as well as symmetrial exostoses at the lower borderline of the mandible and condylar processes deformed without any apparent cause.