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Representation for light delivery during surface and interstitial photodynamic therapy. A: Surface illumination photodynamic therapy (PDT) for treating superficial malignancies. Laser light is directed to tissue surface via micro-lens fiber. Tumor is located superficially; B: Interstitial PDT treatment for deeper and thicker malignancies. Individual fibers are placed inside 19-gauge needles and inserted into tissue. Number of fibers is selected according to treated volume.
