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Modified Holter Rickham reservoir: a device percutaneous photodynamic treatment of cystic malignant brain tumors.

A modified Holter Rickham reservoir which permit the percutaneous photodynamic treatment of cystic malignant brain tumors, is described. Through this device it is possible to introduce in the tumoral cyst both the photosensitizer drug and the optical fibers, carriers of the light in order to induce the photodynamic process. This treatment, if necessary, can be repeated over and over again, simply through a skin perforation.