Objective To explore the imaging features of X-ray,CT and MRI of osteosarcoma in unusual sites.Methods The clinical data and imaging findings of 13 cases of unusual site osteosarcoma confirmed by pathology were retrospectively ana-lyzed,and the clinical and imaging findings were summarized according to the literature.All of the 13 patients were examined by X-ray and CT,in which seven cases underwent contrast-enhanced CT,eight cases underwent MRI,and six cases underwent con-trast-enhanced MRI.Results Tumors occurred in the pelvis in 4 cases,3 in maxilla,2 in scapula,2 in tibia,1 in distal tibia,and 1 in calcaneus,and 1 in ulna.Six cases were osteolytic lesions,5 cases were osteoblastic,and 2 cases were mixed.Large bone destruction was present in 9 cases,periosteal reaction was present in 2 cases,soft tissue mass was present in 9 cases,and neoplastic bone or tumor calcification were present in 11 cases.Compared with X ray,CT could more directly display the location of the lesion and its relationship with adjacent structures.This kind of medical image also had great advantages in displaying the bone destruction,periosteal reaction,tumorous bones and tumor-like calcification.MRI had advantages over CT in judging the location,size and extent of tumor.Moreover,it coud clearly show the extent of invasion,the spread of medullary cavity and sur-rounding soft tissues,and the formation of soft tissue mass.Conclusion Most osteosarcoma in unusual sites occur in older per-sons.Frequently the lesions are osteolytic in imaging.It is critical to find neoplastic bone and tumor calcification in the lesion.The combination of X-ray,CT and MRI can help to diagnose and differentiate this lesion.
bone neoplasmasosteosarcomatomograpyx-ray computermagnetic resonance imaging
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