Abstract: Objective To study radiographic features of spherical pneumonia and to differentiate it from other spherical lesion and reduce misdiagnosis. Methods 33 cases of Spherical pneumonia clinically diagnosed were analysed retrospectively. Results All of the patients’ chest radiographs features:(1)The size of the lesion in nice cases varied from 2 to 4cm (average 2cm), the lesion presented round or oval shape. (2)Most lesions were located in the peripheral lung parenchyma near the plcural surface;(3)The density at the margin of the lesion was lower than that at the central area, sometimes prescnting a halo like appearance;(4)After short term anti inflammatory therapy, most lesions were obviously reduced in size. While the main CT findings were as follows:(1)The lesion presented a triangular shapc;(2)Rough margins with illdefined outline could be senn;(3)Extensive pleural thicken;(4)The lesions were surrounded by small patches of slightly high density and (or) intensified vascular makings;(5)The density of lesion was cvcn, of which had cavity, no calcification.Conclusion Spherical pneumonia has some specific radiographic features, but cometimes radiographic findings of the lesion is similar to peripheral lung cancer and TB, of which diagnosis must be based on clinical feathers and pathology.

Key words: Spherical, Pneumonia, Clinic, Radiographic