In most tumor cases of neurosurgery, we need to have a rapid section diagnostic of the tumor during the course of surgery. When we have received the results that diagnose the exact dignity of the tumor, we devise the operation strategy for the continuing course of surgery. The tissue sample is sent by taxi to the pathological institute in Heidelberg. It takes approximately 45-60 min until we receive the results by telephone.

Many centers are far away from a pathological institute and the patient may need to be re-operated on there. In stereotaxy it is still more important. We need approximately 15-25 specimens during a stereotaxy, so we can be sure we have a sample with some of the tumor tissue present. With direct contact to a pathological institute we could reduce this dramatically. We prepared a methylen blue slide and used a histological microscope with a video camera attached to it and a digitizer interface for digitized pictures. By use of a modem we send the pictures by telephone line to the pathological institute, where they are assessed. We currently have direct contact with a pathologist so they can tell us from which part of the tumor we should send the other histological pictures.

The procedure takes about twenty minutes. By using this procedure the distance to the pathological institute is irrelevant. The system costs approximately $10000, covering the cost mostly of the microscope and the camera (but we already had the microscope) and can be built by anybody with minimal requirements.