The Imaging Manifestations of Abdominal Inflammatory Myofibroblastic Tumor

Objective To investigate the CT and MRI manifestations of abdominal inflammatory myofibroblastic tumor (IMT) and improve its diagnostic accuracy.Materials and Methods Imaging and clinical data of 6 cases with IMT proved by pathological results were analyzed retrospectively.3 males and 3 females,aged from 1 to 61 years,mean age 35.5 years.5 cases were performed with CT plain scan,in which 4 cases with contrast medium enhancement,1 case had plain scan only.1 case received MRI scan with contrast medium enhancement.Results The anatomic locations included mesenterium(n=4),colon transversum (n=1) and back of prostate (n=1).5 cases were single lesion,1 case was multiple and confertus lesions.4 cases had clear border,2 cases had unclear margin.The maximum diameter of the lesion was 5.3-15.4 cm.CT plain scan in 4 cases showed even density,CT value from 25 to 58HU,1 case was uneven.3 cases were significantly enhanced,including non-homogeneous enhancement of 2 cases,1 case with homogeneous enhancement.1 case presented mild and homogeneous enhancement.2 lesions were seen within and around blood vessels enhancement.1 case had MRI scan and showed soft tissue mass with clear border,the solid part of the lesion showed isotensity signal on T1WI,T2WI showed a slightly hyperintensity signal,the center area showed irregular mucinous degeneration,which displayed significantly hyperintensity in both T1WI and T2WI.After contrast administration,solid part of the lesion displayed homogeneous enhancement,mucinous degeneration region showed no enhancement.Conclusion CT and MRI imaging clearly demonstrate the location and relationship with the surrounding structures of IMT.The final diagnosis relies on pathology examination.