Inflammatory pseudotumor of the liver.

The clinicopathologic features of a rare case of hepatic "inflammatory pseudotumor" are described and compared with those of three similar cases reported in the literature. In all four cases symptoms were systemic. The marked reduction in tumor size and the changing cellular composition, from a predominance of fibroblasts to a predominance of histiocytes, confirmed the reactive nature of the lesion in the present case. The etiology is obscure, and the significance of the associated occlusive phlebitis remains to be determined.