Inflammatory Pseudotumor of the Liver

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Abstract
To report the imaging appearance of inflammatory pseudotumor of the liver with pathologic correlation in three cases. Sonography and CT were performed in all cases. Two lesions were evaluated with MRI. All lesions were resected, and imaging data and histopathology were correlated. In all three cases ultrasonography revealed a hypoechoic wellcircumscribed mass. In one case CT showed a hypodense homogeneous lesion with central calcifications. No enhancement was demonstrated on postcontrast CT. The lesion appeared hypointense relative to the adjacent liver on T1− weighted MRI and isointense on T2-weighted MRI. A perilesional rim was detected in all cases on postcontract CT and/or MRI. This rim correlated with the histopathologic demonstration of a fibrous capsule in all three cases. The following features may be encountered in inflammatory pseudotumor: a homogeneous avascular appearance on CT, isointense signal on T2-weighted MRI, and the presence of a capsule. All these findings correlated well with histopathologic findings.

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