Differential diagnosis of cavitary lung masses by computed tomography

H S Choi, K O Choe, J D Lee, S S Choi
1990 Journal of the Korean Radiological Society  
Wall thickness and inner wall nodularity are two major criteria in the differential diagnosis of benign and malignant cavitating pulmonary nodule by using conventinal radiographs. lt is assumed that post-contrast enhanced CT scan differentiate necrotic and viable portion of the cavity wall by difference in CT density. To evaluate the difference in terms of diagnostic accuracy between the two methods ; measuring summed up thickness of both lower (necrotic) and higher (viable) density portion and
more » ... measuring only higher density portion. 3 7 cavitary lung masses(18 malignant. 19 benign) from 32 patients were studied retrospectively. CT measurements were compared with that of plain radiographs The mean thickness of the thickest part of the wall were 20:t 13 mm and 30 :t 17mm in benign and maligna nt cavity (p > 0.05 l. respectively. when both lower and high er density were measured. However. when measured only higher density portion . the means were 5 :t3mm in benign and 15:t9mm in maligna nt lesion s , of which difference was statistically s ignificant (p < 0.01). The thickest part of the higher d ensity portion was less tha n 5mm in 외 1 14 benign lesions. while seven of eight (87 .5 % ) malignant lesions had 16mm or greater. The inner wall of the cavity was smooth in 84.2 % and 6 % of the benign and malignant lesions. respectively. In conclusion. our data suggests that assessing the wall thickness a nd inner wall nodularity by measuring higher (enhancing) density portion of the cavitary mass is superior to the methods that measures the whole wall thickness. Index Words: Lung. cavitation 60.3224 Lung. CT 60.1211 Lung n eoplasm. CT Tuberculosis. pulmonaηr 60 .23 24 본 논문은 1 989 년도 연세대학교 의과대학 연구위윈회 연 구강사 연구 비 의 지원올 받은 것임 • 해 성병원 방사 선 과 • Department of Radíology. Hae Sung Hospítal 이 논 문은 1 990 년 7 월 20 일 접수하여 1990 년 9 월 1 2 일에 채택되었음 -최형식 외 : 전산화단충촬영술을이용한공동성 폐 종 괴의 감별진단 장 두꺼운 벽두께 는 양성군에서 는 5 :1: 3mm , 악성 군 에 서 는 1 5 :1: 9mm 였으며, 두 군 간에 통 계적으로 현저한 차이 를 보였다 ( p0.05 ) . 반면에 조영증강되는 벽의 경우 , 양성 군 에서는 3 :1: 3mm , 악성군에서는 10 :1: 6 mm 으로서 두 군 간에 통계적 유의성이 있었다 ( p< 0.05 ) ). 공동성 폐종괴 내 벽의 결절양상을 분석한 결과, 공 동내 공기 에 의해 경계되는 벽의 경우는 양성 군 에서는 편평형 (s mooth ) 이 9 예 ( 47.4 % ) , 결절 형 ( n odul ar ) 이 1 0 예 ( 52 .6 % ) 였고 , 악성군에서는 편평형 이 3 예(1 7 % ) , 결절형이 1 5 예 ( 83 % ) 였다. 반면에 조영증강되 는 벽의 경우, 양성 군 에서는 펀평형이 16 예 ( 84.2 %) , 결절형 이 3 예 (1 5 . 8 % ) 였고, 악성 군은 편평형이 1 예
doi:10.3348/jkrs.1990.26.6.1164 fatcat:p5p2vvf7fjhm5gpv4bwjwh3lze