간의 염증성 거짓종양의 자기공명 영상 소견

Abstract

Purpose: The purpose of our study was to evaluate magnetic resonance imaging (MRI) findings of inflammatory pseudotumor of the liver. Materials and Methods: Authors reviewed the patient records of 14 patients who performed abdominal MRI scan among 36 patients who performed abdominal computed tomography (CT) and/or MR scans with inflammatory pseudotumor from October 2001 to October 2008. 13 patients were confirmed by surgery or CT or ultrasound (US)-guided needle biopsy and 1 patients were diagnosed by showing much improvement on follow-up study. We retrospectively evaluated MRI findings of inflammatory pseudotumor. We analyzed mass size, location, signal intensity and pattern on T1-weighted image (T1WI) and T2-weighted image (T2WI), and enhancement degree and pattern from arterial phase, portal phase, and equilibrium phase. Results: 21 lesions of inflammatory pseudotumor of the liver were detected among 14 patients. The size of lesions was variable from 10 mm to 56 mm and the mean in size was 22 mm. Among 21 lesions, 17 lesions were located in the right lobe and 4 lesions were located in the left lobe. On T1WI, 19 lesions showed hypointense and 2 lesions were isointense. On T2WI, all lesions showed hyperintense. In Gd-enhnaced arterial phase, 11 lesions showed more enhancement but each 6 lesions and 4 lesions showed less and iso enhancement as compared with hepatic parenchyma. 7 lesions showed peripheral enhancement. 2 lesions showed nodular enhancement. 3 lesions had peripheral rim showing hypointense. In portal phase, 14 lesions showed more enhancement and 7 lesions showed less enhancement as compared with hepatic parenchyma. In enhancement pattern, 16 lesions showed peripheral enhancement and 2 lesions showed internal nodular enhancement, and 3 lesions showed homogeneously hypointense. In equilibrium phase, all lesions showed more enhancement as compared with hepatic parenchyma. In enhancement pattern, 20 lesions showed peripheral enhancement with less or non-enhancing internal portion. Only one lesion showed diffuse homogeneous enhancement. Conclusions: Peripheral enhancement with internal non or less-enhancing portion on the Gdenhanced portal and delayed phase is meaning finding in suggestion of inflammatory pseudotumor of the liver.