Objective To evaluate the advantage of using computer navigation system in the resection of rib tumors.Methods We carried out rib tumor resection in 5 patients using computer navigation system.Preoperative CT of each patient was performed.The preoperation CT-based planning was made for every patient with the navigation system software including confirming the tumor surgical margin and designing resection margin.A C-arm scan was carried out intraoperatively.With image fusion of both data,tumor resection were performed under navigation image guidance.Results The mean time of image fusion was 58 minutes.Four tumor resection specimens showed safe and clear margins.Histological examination of all tumor specimens showed tumor-free margins.One patient who was suspected lung cancer with bone metastases was performed a biopsy under navigation image guidance and obtained a pathology diagnose successfully.Conclusion The computer navigation system helps surgeons determine the surgical margin,implement precision tumor resection and reduce surgical damage.

Objective 3D printing has been used in the assistanceof surgical planning and the development of personal-ized prostheses.This study was to determine the feasibility of using a 3D printer for the purpose of producing personalized pros-theses for complex rib fracture fixation .Methods Using data from a high-resolution CT scan of 10 ribs of 3 cases with rib frac-ture, rib moldswere generated with computer software and fabricated with the 3D printer using the fused deposition modeling method.The 3D printing molds were used for custom-designed titanium plate.Results The average length of the 3D models of ribs is 8.45 cm.The mean time of fabricating models was 18.8 minutes and 4.6 gram polylactic acid was consuming on aver-age.The mean error of dimension of 3D models is less than 0.2 mm.Reshaping plates spends 3.3 minutes on average.Radio-logical follow-up for bothcases demonstrated successful fixation at 3 months.Conclusion These cases demonstrate the feasibili-ty of the use of 3D modeling and printing to develop personalizedplates and can ease the difficulty of complex rib fracture .

Objective To explore the possibility of minimally invasive resection of chest wall tumor by video-assisted tho-racoscopic surgery( VATS) .Methods Retrospective analysis of 24 cases of chest wall tumors with minimally invasive resec-tion by VATS from June 2013 to May 2017, including 13 cases of bone fibrous dysplasia, 7 cases of rib abnormal hyperplasia of fiber, 2 cases of cartilaginous tumor, 1 case of Langerhans histiocytosis and 1 case of extramedullary single plasma cell tumor.3 cases with C arm positioning in operation and 4 cases with computer navigation and positioning .Results 24 cases of rib tumors were successfully removed .No surgical death and serious complications occurred in this group .All patients followed up 1-3 years, there is no recurrence.Conclusion Resection of rib tumors with VATS can bring precise resection and lead to minimally invasive.