CT evaluation of normal thoracic cage and its development in Chinese children

Yung-Liang WAN, Jin-Haur CHUANG, Man-Shan KONG, Sing Kai LO, Chung-Chueng TSAI

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Background: To establish objective data for evaluation of normal chest and its development in Chinese children.
Materials and methods: A computed tomography of the lower chest was performed in 75 normal chinese children. The pectus index (a/c), depression (b/c), asymmetry (b'/b), and flatness (a/b) of the chest wall were evaluated, where a was the maximum transverse diameter of the chest, b and b' were the maximum sagittal diameter of the left and right chest respectively, and c was the shortest midline sagittal diameter of the lower chest.
Results: The pectus index significantly increased from 2.34 ± 0.26 in group A (n = 22, 3 to 6-year-old) to 2.58 ± 0.24 in group B (n = 30, 7 to 11-year-old) (p = 0.002), and to 2.63 ± 0.33 in group C (n = 23,12 to 16-year-old) (p = 0.002). The degree of asymmetry was significantly different between groups B and C (1.02 ± 0.04 versus 0.99 ± 0.04, p = 0.024). The degree of depression was significantly different between groups A and B (1.49 ± 0.11 versus 1.58 ± 0.10, p = 0.0009) and groups A and C (1.49 ± 0.11 versus 1.60 ± 0.09, p = 0.0009). The degree of flatness was 1.57 ± 0.11 in group A; 1.64 ± 0.10 in group B; and 1.64 ± 0.14 in group C.
Conclusion: The above findings suggest that the thoracic cage grows more in the transverse direction as a child grows. This normal data can be used for assessing severity of chest wall deformity and its surgical outcome.
建立客觀標準數據以評估中國孩童正常的胸廓和其發育,以利於畸形胸廓及漏斗胸之評估與臨床處理。對75位正常中國孩童之下半胸廓予以電腦斷層檢查,以求取不同年齡層胸廓之胸壁係數(a/c)、凹陷度(b/c)、不對稱性(b'/b)和扁平度(b/a)之正常值。以上c為下半胸廓中線前後最小直徑,b,與b分別為左胸與右胸最大前後經,a為最大橫徑。胸壁係數由A組(3至6歲)之2.34±0.26有統計意義的上升到B組(7至11歲)的2.58±0.24(P=0.002)及C組(12至16歲)的2.63±0.33,(P=0.002),不對稱性在B組(1.02±0.04)與C組(0.09±0.04)有統計意義的差異(p=0.024)。凹陷度在A(1.49±0.11)與B組(1.58±0.10)之間和A(1.49±0.11)與C(1.60±0.09)組之間也有意義的差別(P=0.0009)。扁平度在A組為1.57±0.11±,B組為1.64±0.10,C組為1.64±0.14。由以上結果得知孩童成長時,胸廓橫向的發育較縱向顯著。所得數據可用以評估胸壁畸形病變,並對術前及術後漏斗胸提供重要及客觀的依據。 Copyright © 1997 The Radiological Society of the Republic of China.
Original languageEnglish
Pages (from-to)53-57
JournalChinese Journal of Radiology
Issue number2
Publication statusPublished - Apr 1997


Wan, Y.-L., Chuang, J.-H., Kong, M.-S., Lo, S.-K., & Tsai, C.-C. (1997). CT evaluation of normal thoracic cage and its development in Chinese children. Chinese Journal of Radiology, 22(2), 53-57.


  • Children
  • Respiratory system
  • Thorax
  • CT
  • 兒童
  • 呼吸系統
  • 胸廓
  • 電腦斷層
  • Alt. title: 以電腦斷層攝影評估正常中國孩童之胸廓及其發育


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