The imaging of extrapulmonary inflammatory myofibroblastic tumor

WANG Yingying; SUN Yuanyuan; WANG Hai xia; WANG Lizhong

Abstract：Objective To analyze the imaging of extrapulmonary inflammatory myofibroblastic tumor(IMT)and to improve the knowledgement of it.Methods 6 cases of IMT were confirmed by pathology,in which 5 cases underwent immunohistochem-istry examination.The imaging appearances were retrospectively discussed.Results All cases were solitary and occured in pleu-ra,right lower quadrant,spleen,liver,vocal cord and underjaw,respectively.6 cases underwent CT scan and 4 cases underwent enhanced scan.1 case underwent MRI plain and contrast scan.CT demonstrated soft tissue mass in 5 cases with well defined boundary,regular shape and slight or moderate enhancement.1 case demonstrated slightly thick vocal cord.Necrosis without en-hancement can be seen in the center of spleen IMT.The right lower quadrant lesion appeared equal signal on T 1WI,lower signal on T2WI,and high signal on DWI.The tumor tissue consisted of spindle fiber cells with a large amount of inflammatory cell infil -tration.SMA expressed positively on immunohistochemistry.Conclusion IMT appeared no specificity in imaging, pathology should be done to confirm it.But,imaging can reveal the lesion itself and relationship to the surrounding tissue.It has a certain value in prognosis and follow-up.