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Acridine orange (AO) has unique biological actions enabling tumor visualization (fluorovisualization) and a strong cytocidal effect (photodynamic therapy: AO-PDT) under illumination with blue light. Accordingly, in this study, we attempted to develop a new surgical technique for total tumor cell elimination using these photodynamic reactions with AO in a mouse osteosarcoma model. The results showed that local tumor recurrence was significantly inhibited (23%) in the group treated with curettage under fluorovisualization and AO-PDT, compared to that (80%) in the control group treated with curettage alone under ordinary light. Therefore, we concluded that the combination of curettage under fluorovisualization and AO-PDT may be useful for total tumor cell elimination with minimum damage to normal tissue in musculoskeletal sarcomas.Copyright © 2000 S. Karger AG, Basel [ABSTRACT FROM AUTHOR]