[Treatment concepts of benign bone tumors and tumor-like bone lesions].

The indications for surgical treatment of benign bone tumors and tumor-like lesions depend on the biological activity, clinical symptoms and anatomic location of the the lesion. Clinically silent lesions ("leave me alone Lesions") lacking any scintigraphic enhancement and without danger of pathologic fracture or malign transformation only need surveillance and do not require surgery.However, tumors becoming symptomatic, displaying progression after termination of skeletal growth or radiographic signs of malignancy should be scheduled for surgical intervention. For most benign tumors intralesional curettage and subsequent bone grafting is the treatment of choice, maintaining structural integrity and functional stability of the bone and adjacent joint. In case of uncertain histopathological diagnosis an open biopsy should be performed followed by definitive either marginal or en-bloc resection, preferably at a single procedure. Depending on the tumor-specific risk of recurrence, adjuvant measures as phenol instillation or cryotherapy using liquid nitrogen may additionally be applied. As for the unicameral juvenile bone cyst or osteoid osteoma alternative minimal invasive techniques like corticoid injection and CT-guided percutaneous eradication of the nidus have been successfully introduced into clinical practice. Depending on the activity of the tumor recurrent lesions are recommended to be treated by marginal or enbloc resection. The radical and aggressive mode of surgical therapy has to be balanced with the treatment-related morbidity, i.e. complication rate, possibilities for reconstructive stabilizations and resultant functional deficits,making the decision a responsible challenge to the orthopedic surgeon.