Colorectal adenomas and possibly some hyperplastic polyps are precursors of colorectal cancer. Tobacco use is associated in epidemiologic studies with these polyps, although links between smoking and colorectal cancer are less consistent. To characterize the role of tobacco in early colorectal carcinogenesis, we compared tobacco use among 4,383 subjects with histologically verified benign (hype...

BACKGROUND The prevalence of colorectal polyps and adenomas in the general population of Mexico is unknown. AIM To determine the prevalence and risk factors for colorectal polyps detected during flexible sigmoidoscopy (FSIG) in asymptomatic patients. MATERIAL AND METHODS From 1995 to 2008, FSIG was performed as part of a complete check-up in patients who had lived in northeast Mexico for ov...

Colorectal polyps are precursor lesions of colorectal cancer; hence, early detection and dysplasia grading essential for determining cancer risk, the possibility developing subsequent polyps, follow-up recommendations. The significant contribution this study is development an enhanced deep-learning model called Fast Fourier Convolutional ResNet (FFC-ResNet) to classify grades polyps. It based o...

Serrated adenomas are the precursors of at least 5.8% of colorectal cancers; otherwise little is known of their clinical significance in comparison with conventional adenomas and hyperplastic polyps. We compared the risk of metachronous lesions in colorectal serrated adenomas, conventional adenomas, and hyperplastic polyps. A consecutive series of patients with colorectal polyps first diagnosed...

BACKGROUND The real accuracy of computed tomographic colonography (CTC) is still unknown. OBJECTIVE To perform a meta-analysis of the diagnostic accuracy of CTC for the detection of polyps and colorectal tumors. METHODS SELECTION OF STUDIES Studiesassessing the accuracy of CTC for the detection of colorectal polyps and tumors were selected. data synthesis: Meta-analyses combining sensiti...

INTRODUCTION Endoscopic polypectomy is the gold standard in the treatment of colorectal polyps. The importance of polypectomy rests primarily on the fact that polyp-type lesions present a high risk of malignant degeneration, colorectal polyps being able, if left unattended therapeutically, to generate a colorectal cancer (CRC) - a lesion with a far more negative prognosis. Although preferable, ...

BACKGROUND Virtual colonoscopy is a potentially powerful tool for non-invasive colorectal evaluation. In vitro studies have established its accuracy in simulated polyp detection but little data exist regarding its use in clinical practice. AIMS To evaluate the ability of virtual colonoscopy to detect colorectal cancers and polyps in patients with endoscopically proven colorectal neoplasms and...

Familial adenomatous polyposis (FAP) is a rare syndrome characterized by the presence of hundreds to thousands of colorectal adenomas and is responsible for less than 1% of all colorectal cancers. The syndrome is also characterized by extra-colorectal features including amongst others upper gastrointestinal tract polyps and desmoid tumors. The syndrome is inherited by an autosomal dominant gene...

In this thesis we address the problem of segmentation and detection of colorectal polyps in endoscopic images obtained by a wireless capsule endoscopic device. As colorectal polyps are precursors to colonic cancer, and an early detection and removal of colorectal polyps can positively affect the prognosis of colonic cancer (one of the leading causes of death by cancer), it is our goal to develo...