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Detection of Colorectal Lesions: Lower-Dose Multi–Detector Row Helical CT Colonography Compared with Conventional Colonoscopy ¹

¹ From the Department of Radiological Sciences, University of Rome–La Sapienza, Policlinico Umberto I, Viale Regina Elena 324, Rome, Italy 00161 (R.I., A.L., C.C., F.M., S.T., F.P., R.P.); and Department of Diagnostic Radiology, Yale University School of Medicine, New Haven, Conn (J.A.B.). From the 2002 RSNA scientific assembly. Received October 30, 2002; revision requested January 9, 2003; final revision received April 8; accepted April 30. Address correspondence to R.I. (e-mail: riannaccone@tiscali.it).

View larger version (119K): [in a new window]   Figure 1a. Images of a colon carcinoma lesion with a 30-mm diameter in a 72-year-old man. (a) Transverse CT colonographic image shows a lesion (arrow) in the hepatic flexure. (b) Three-dimensional volume-rendered endoluminal CT image better demonstrates the morphology of the neoplasm (arrow).

View larger version (113K): [in a new window]   Figure 1b. Images of a colon carcinoma lesion with a 30-mm diameter in a 72-year-old man. (a) Transverse CT colonographic image shows a lesion (arrow) in the hepatic flexure. (b) Three-dimensional volume-rendered endoluminal CT image better demonstrates the morphology of the neoplasm (arrow).

View larger version (104K): [in a new window]   Figure 2a. Images of a 9-mm sessile polyp in a 61-year-old man. (a) Transverse CT colonographic image shows a 9-mm polyp (arrow) with round borders in the descending colon. (b) The polyp (arrow) is clearly seen on the coronal CT colonographic image. (c) Sagittal CT colonographic image confirms the presence of the polyp (arrow). (d) Three-dimensional volume-rendered endoluminal CT image shows that the polyp (arrow) has round borders.

View larger version (108K): [in a new window]   Figure 2b. Images of a 9-mm sessile polyp in a 61-year-old man. (a) Transverse CT colonographic image shows a 9-mm polyp (arrow) with round borders in the descending colon. (b) The polyp (arrow) is clearly seen on the coronal CT colonographic image. (c) Sagittal CT colonographic image confirms the presence of the polyp (arrow). (d) Three-dimensional volume-rendered endoluminal CT image shows that the polyp (arrow) has round borders.

View larger version (102K): [in a new window]   Figure 2c. Images of a 9-mm sessile polyp in a 61-year-old man. (a) Transverse CT colonographic image shows a 9-mm polyp (arrow) with round borders in the descending colon. (b) The polyp (arrow) is clearly seen on the coronal CT colonographic image. (c) Sagittal CT colonographic image confirms the presence of the polyp (arrow). (d) Three-dimensional volume-rendered endoluminal CT image shows that the polyp (arrow) has round borders.

View larger version (91K): [in a new window]   Figure 2d. Images of a 9-mm sessile polyp in a 61-year-old man. (a) Transverse CT colonographic image shows a 9-mm polyp (arrow) with round borders in the descending colon. (b) The polyp (arrow) is clearly seen on the coronal CT colonographic image. (c) Sagittal CT colonographic image confirms the presence of the polyp (arrow). (d) Three-dimensional volume-rendered endoluminal CT image shows that the polyp (arrow) has round borders.

View larger version (125K): [in a new window]   Figure 3a. Images of a sessile 4-mm polyp in a 64-year-old man. (a) Transverse CT colonographic image shows a 4-mm polyp (arrow) with round borders in the rectum. (b) Coronal CT colonographic image confirms the presence of the polyp (arrow). (c) The polyp (arrow) can be clearly seen on the sagittal CT colonographic image. (d) Three-dimensional volume-rendered endoluminal CT image shows the tiny polyp (arrow) arising from the colonic mucosa.

View larger version (124K): [in a new window]   Figure 3b. Images of a sessile 4-mm polyp in a 64-year-old man. (a) Transverse CT colonographic image shows a 4-mm polyp (arrow) with round borders in the rectum. (b) Coronal CT colonographic image confirms the presence of the polyp (arrow). (c) The polyp (arrow) can be clearly seen on the sagittal CT colonographic image. (d) Three-dimensional volume-rendered endoluminal CT image shows the tiny polyp (arrow) arising from the colonic mucosa.

View larger version (129K): [in a new window]   Figure 3c. Images of a sessile 4-mm polyp in a 64-year-old man. (a) Transverse CT colonographic image shows a 4-mm polyp (arrow) with round borders in the rectum. (b) Coronal CT colonographic image confirms the presence of the polyp (arrow). (c) The polyp (arrow) can be clearly seen on the sagittal CT colonographic image. (d) Three-dimensional volume-rendered endoluminal CT image shows the tiny polyp (arrow) arising from the colonic mucosa.

View larger version (144K): [in a new window]   Figure 3d. Images of a sessile 4-mm polyp in a 64-year-old man. (a) Transverse CT colonographic image shows a 4-mm polyp (arrow) with round borders in the rectum. (b) Coronal CT colonographic image confirms the presence of the polyp (arrow). (c) The polyp (arrow) can be clearly seen on the sagittal CT colonographic image. (d) Three-dimensional volume-rendered endoluminal CT image shows the tiny polyp (arrow) arising from the colonic mucosa.