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Screening CT Colonography in an Asymptomatic Average-Risk Asian Population: A 2-Year Experience in a Single Institution

Sangbu An1, Kyoung Ho Lee1, Young Hoon Kim1, Seong Ho Park2, Hyun Young Kim3, Se Hyung Kim4 and Nayoung Kim5

1 Department of Radiology, Seoul National University Bundang Hospital, 300 Gumi-dong, Bundang-gu, Seongnam-si, Gyeonggi-do, 463-707, Korea.
2 Department of Radiology, Asan Medical Center, University of Ulsan College of Medicine, Research Institute of Radiology, Seoul, Korea.
3 Health Promotion Center, Seoul National University Bundang Hospital, Seongnam-si, Gyeonggi-do, Korea.
4 Department of Radiology and Institute of Radiation Medicine, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea.
5 Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam-si, Gyeonggi-do, Korea.


Figure 1
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  		Fig. 1 —Main findings and disposition of 1,015 consecutive asymptomatic average-risk patients who underwent screening CTC at a Korean institution over 2-year period. CTC = CT colonography, OC = optical colonoscopy, CO = inadequate study that would potentially miss polyp ≥ 10 mm, C1 = no significant polyp, C2 = one or two 6- to 9-mm polyps, C3 = polyps ≥ 10 mm or ≥ 3 polyps 6- to 9-mm, C4 = malignant-appearing mass.

 

Figure 2
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  		Fig. 2A —Asymptomatic 49-year-old man at average risk for colorectal neoplasm. CT colonography (CTC) was acquired with tube potential of 90 kVp and average effective tube current of 17 mAs. 3D CTC fly-through image shows 10-mm sessile polyp (arrow) located in sigmoid colon.

 

Figure 3
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  		Fig. 2B —Asymptomatic 49-year-old man at average risk for colorectal neoplasm. CT colonography (CTC) was acquired with tube potential of 90 kVp and average effective tube current of 17 mAs. Transverse 2D view confirms that polyp identified in A is soft-tissue lesion (arrow). CTC result was categorized as C3, polyps ≥ 10 mm or three or more 6- to 9-mm polyps.

 

Figure 4
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  		Fig. 2C —Asymptomatic 49-year-old man at average risk for colorectal neoplasm. CT colonography (CTC) was acquired with tube potential of 90 kVp and average effective tube current of 17 mAs. Digital photograph obtained at optical colonoscopy shows same polyp (arrow), which proved to be tubular adenoma at histologic examination.

 

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