Inflammatory pseudotumor of the lung：CT findings and misdiagnosis analysis

Abstract:

Objective：To study the CT features of inflammatory pseudotumor of the lung（IPL） and to improve the understanding of IPL. Methods：CT findings were retrospectively reviewed in 26 patients with IPL proved by pathology. Results：The lesions of 20 pa－tients were located at the right lung and those of 6 patients were at the left lung. The lesions usually presented different appearances：19 cases of irregular fan-shape，7 cases of spherical shape，a knife cut edge in 17 cases and 5 cases of low density halo-shape. The density of the lesions was homogeneous in 14 cases and heterogeneous in 12 cases，with CT value of 12-41 HU；4 cases were highly enhanced，with CT value reaching more than 100 HU；9 cases were significantly enhanced on the edge；6 cases were moderately en－hanced and the CT value was 70-80 HU. Pleural change：wide base of 14 cases with adjacent pleural thickening. Seven patients with primary lymph node enlargement. Conclusions：The main CT features of IPL are as follows：the lesions were usually single，adjacent pleural，fan-shaped and highly enhanced；the edge has the burr. The comprehensive analysis of clinical history and CT imaging is helpful to improve the accuracy of diagnosis of this disease，and reduces the rate of misdiagnosis