[Bone fluorosis]

It is reported on a 80-year-old man with a pronounced bone fluorosis which was ascertained by X-ray findngs, dissection, and determination of the fluor content of the bones. Since there was no professional flour exposition a so-called neighbourhood fluorosis was to be assumed. It was caused by an already naturally increased fluor content of drinking water, which was essentially increased by the sewage of a fluor plant. In addition to this an increased fluor emission was present, since the patient has lived for more than 30 years in the nearest environment of the plant. By suitable measures the prescribed values of the fluor content of drinking water and of the fluor emission have to be kept.