Inflammatory pseudotumor of the liver: sonographic and computed tomographic features with complete regression.

An inflammatory pseudotumor is a rare benign lesion consisting of fibrous tissue and inflammatory cells. Although it can appear anywhere in the body, the most common site for this lesion is the lung.1 The hepatic counterpart was first described in 1953 by Pack and Baker.2 Since then only about 50 cases have been reported in the literature.3 The clinical and pathologic features have been well described. The imaging appearances have also been reported but to a lesser extent. We report a case with a hepatic inflammatory pseudotumor in a patient with fever and weight loss whose ultrasonographic scan initially showed no evidence of disease but subsequently became “positive” for a space occupying lesion. Histologic diagnosis was made by percutaneous fine needle aspiration and percutaneous needle biopsy. Follow-up ultrasonography and CT after treatment showed total regression of the pseudotumor.