Introduction: Limb salvage surgery involves all of the surgical methods to achieve the eradication of a malignant neoplasm and restoration of the limb with a satisfactory oncologic, functional, and cosmetic outcome. Rates of local recurrence are 4% to 10%. There is a chance of local recurrence from the contamination of biopsy path. Neoadjuvant chemotherapy has a guarding effect on managing neoplasm infiltration at the biopsy location.Case Presentation: An 18 year old male experienced a new painless lump at his right anterior thigh with size about 5 cm in diameter since 5 months ago. Previously, he underwent limb salvage surgery with megaprosthesis about 6 months ago due to osteosarcoma at his right distal femur. He also got neoadjuvant and adjuvant chemotherapy for 6 cycles. Mass removal was done and 1.5 cm mass in diameter was found within quadriceps muscle with a soft consistency and well-defined border from the previous biopsy site that had not been resected. The specimen result was osteosarcoma surrounded by tumor-free tissue. Postoperatively, he still had the same range of motion function as before.Conclusions: We need to consider the previously contaminated biopsy path that could lead to local recurrence. Factors that affect the prediction of the recurrent disease are the disease-free time period, location of recurrence and histological response to therapy and the capability to achieve total surgical removal. Tumor removal followed by the local radiation and chemotherapy is the preferred treatment for recurrence.

Background: Pelvic chondrosarcoma may be difficult to manage due to its proximities with vital structures. The study aimed to explain an alternative surgical technique for acetabular reconstruction.Case Presentation: We present a case of a 48-year-old female with large chondrosarcoma of the superior and inferior pubic rami with medial acetabular wall involvement. Pelvic type 3 resection was performed. There was a defect at medial acetabulum after resection. The defect was covered by autograft from iliac and fixation using screws. Rotational pelvic stability was maintained using a reconstruction plate. The functional outcome was assessed 6 months after operation using MSTS and the score was 30, which was painless, full weight bearing, normal gait, and no pain. Conclusions: Reconstruction of the pelvis after tumor resection requires a careful preoperative patient evaluation and extensive bone and soft tissue resection to achieve negative tumor margins and stable reconstruction of the osseous and soft tissue defects.

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