Abstract: Objective The aim of this study was to summarize the feature of spiral CT multi-phase enhancement of inflammatory pseudotumor of the liver (IPL). Methods 32 patients with IPL were encountered in our hospital between March 2018 and March 2023, and all underwent 64-slice spiral CT multi-phase enhancement scan. The diagnosis was confirmed pathologically from tissues by surgery or fine needle aspiration biopsy. Results The plain CT scan showed intrahepatic lesions in the right lobe in 19 cases, in the left in 8 cases and in caudate lobe in 5 cases; the single lesions was found in 20 cases and multiple lesions in 12 cases, with the diameter of 2.5-5.0 cm; the appearances of the lesions was multiple, roundness, ellipse or ellipse-like; in plain CT scan, the IPL was low-density or equal-density with a vague edges; the enhancement scan showed the lesions were not obviously intensified at arterial phase; in the portal phase, the lesions was totally intensified in 13 cases, the edges mildly to moderately intensified in 7 cases, the central intensified with the stalactite-like edges in 6 cases, and the inhomogeneous lesions intensified in 6 cases; in the delayed phase, most lesions was still mildly intensified; the CT scan also revealed some indirect signs, such as local stricture or dilatation of the bile ducts, lobe atrophy, inhomogeneous wall incrassation, stricture or even obstruction of portal vain. Conclusion The IPLs really have some special CT manifestation feature, which might help differentiate the diagnosis.

Key words: Inflammatory pseudotumor of the liver, CT multi-phase enhancement scan, Feature, Diagnosis