[Colorectal cancer screening with virtual colonography]

Area of Science:

• Medical Imaging
• Gastroenterology
• Oncology

Background:

• Colorectal cancer (CRC) incidence is declining in Germany, but remains a significant cancer.
• Improved prognosis with a 5-year survival rate of approximately 65% for CRC.
• Early detection and prevention through precursor identification can further improve outcomes.

Purpose of the Study:

• To explore advanced imaging screening methods for colorectal cancer (CRC).
• To address the low participation rates in current colonoscopy screening.
• To evaluate the potential of virtual colonography techniques in CRC screening.

Main Methods:

• Review of studies on virtual colonography accuracy compared to endoscopy.
• Analysis of available data for computed tomography (CT) and magnetic resonance imaging (MRI) in colonography.
• Discussion of challenges and established classification systems like CT Colonography Reporting and Data System (C-RADS).

Main Results:

• Virtual colonography demonstrates comparable accuracy to endoscopy (around 90%) for detecting polyps larger than 5 mm.
• CT colonography (CTC) data is more extensive than MRI data.
• CT Colonography Reporting and Data System (C-RADS) provides a standardized classification for findings.

Conclusions:

• Low participation in colonoscopy necessitates exploring alternative screening methods like imaging.
• CT colonography (CTC) faces radiation concerns in Germany, and MRI screening is not yet established.
• Familiarity with C-RADS classification is crucial for radiologists interpreting CTC studies.