Objective To discuss the imaging findings of ES/pPENT in pelvic bones and to improve the cognition. Methods Eight patients with ES/pPENT in pelvic bones with pathologically proved were retrospectively analyzed for their clinical, pathologic and radiologic features. All the patients were underwent X-ray examination, 4 patients performed CT examination, and 7 patients performed MR. Imaging findings include: the location, number, bone destruction, periosteum reaction and bone, soft tissue mass, and enhancement mode. Pathological examination of the observed indicators include morphology and immunohistochemistry. Results 7 cases showed osteolytic bone destruction; and only one case showed sclerosis bone destruction .7 cases showed huge and uneven density soft tissue mass with bone destruction, and in 6 cases which the maximum diameter of the tumor were more than 8cm.4 cases involved the adjacent joints; MR imaging showed line dark signal interval in soft tissue mass on T2WI, with partly enhancement. 6 cases was found with metastases, and 3 were in pulmonary. Immunohistochemical CD99 of all cases were positive expression. Conclusion ES/pPENT shows certain characteristics, but lacks the specificity. Pathological examination is mandatory to confirm the diagnosis. For young patients with bone destruction and soft tissue mass, the chance of ES/ pPNET should be considered.