Objective To investigate the CT features of peripheral primitive neuroectodermal tumors. Methods The clinical and CT data of 12cases with pPNET confirmed by pathology were retrospectively analyzed. Results The tumors were located in 5 cases of pelvic cavity (including prostate in 2 cases, ovary in 1 cases), chest 4 cases(chest wall in 3 cases, lung in 3 case), abdominal cavity, left thigh and sacral-iliac bone in 1 cases, there were single lesion in 10 cases and multiple lesions in 2 cases. The tumor size was 6.2-22cm,with the average value of 12cm. CT showed that most of the lesions were mixed with hypodense and iso or hypodense, and the boundary of lesions was not clear. Inhomogeneous enhancement from slight to moderate was showed in the lesions on contrast CT scan, and there was no enhancement of cystic degeneration and necrosis. Conclusion CT features of PNET have the general characteristics of malignant tumors, the pPNET should be highly suspicious on chest wall aggressive soft tissue tumor especially in children and adolescents. The CT imege can be used to show the size, internal structure of tumor, help to define their scope and distant metastasis. The pPNET final diagnosis depends on histopathological examination.