Analysis and identification of CT signs of pulmonary hamartoma

ZHANG X ing-qiang; LI Sheng; GE Peng

Abstract：Objective This study aims to investigate CT sign characteristics of pulmonary hamartoma to increase the dif‐ferential diagnosis ability .Methods A retrospective analysis was conducted for CT images of 19 cases of patients with pulmonary hamartoma confirmed by surgical pathology ,and characteristics and occurrence frequency of various signs were concluded and analyzed .Results All 19 cases of pulmonary hamartoma were of single lesion .Sixteen cases occurred in the right lung (84 .21% ) ,and 3 cases occurred in the left lung (15 .79% ) .For nodules ,17 pieces presented shallow lobula‐tion change (89 .47% ) ; 15 pieces presented round/round‐like change (88 .24% ) ; 16 pieces presented smooth edge (84.21% ) ; 18 pieces presented nodular calcification (94 .74% ) , including 10 pieces of popcorn‐like calcification (55.56% ) and 8 pieces (44 .44% ) of nodositas calcification ;15 pieces presented detectable obvious fat density (78 .95% ) . One case presented nodule‐adjacent pleural thickening (5 .26% ) ,and 3 cases presented uneven thickness of linear opacity connection between nodule and hilus pulmonis (15 .79% ) .In addition ,1 case presented mediastinal lung lymph node en‐largement accompanied with calcification (5 .26% ) ,and 19 cases presented no pleural effusion ;CT enhancement showed pulmonary artery running around nodules and no obvious blood supply arteries .Among 5 cases of enhancements ,4 cases of mild enhancements constantly strengthened (enhancement value :10 ~ 20 HU ) ,and there was 1 case of moderate en‐hancement (enhancement value :21 HU) .Conclusion CT manifestations of pulmonary hamartoma have stronger charac‐teristics ,and a comprehensive analysis of CT characteristics helps to improve the diagnostic accordance rate and to reduce misdiagnosis .