Background: Multiple studies have demonstrated that abdominal ultrasonography is useful for the diagnosis of colorectal cancer [CRC]. However, controversy still exists.
The aim of the work: The purpose of the study is to assess the efficacy of bowel ultrasonography in detecting colon malignancies and how it compares to colonoscopy in terms of accuracy.
Patients and Methods: This cross-sectional study included 50 adults referred to the endoscopy unit at Al-Azhar University Hospital [Damietta] for suspected colon cancer. All patients underwent ultrasonography before colonoscopy. Results of the ultrasound and colonoscopy were then compared. 
Results: Of the 36 cases diagnosed by US as colon cancer, colonoscopy confirmed 32 as positive. Of the 14 cases diagnosed by US as negative, colonoscopy confirmed 11. Comparing US findings to histopathology, of the 36 US-positive cases, histopathology confirmed 30; of the 14 US-negative cases, histopathology confirmed 12. The sensitivity, specificity, positive predictive value, and negative predictive value of US for CRC diagnosis compared to colonoscopy were 91.4%, 73.3%, 88.8%, and 78.5%, respectively.
Conclusion: A bowel ultrasonography scan can safely and noninvasively detect colorectal cancer.