![]() ![]() Alternatively, WE-CTC relies on retrograde colonic filling using water coupled with mural enhancement by intravenous contrast medium, and provides excellent visualization of the enhanced colonic wall, with good contrast between the wall itself, the hypodense lumen, and the pericolonic fat. Ct flexture manual#Gas CTC (also known as “virtual colonoscopy”) uses automated or manual insufflation of carbon dioxide or air for colonic distension to detect polyps as part of screening for preneoplastic changes. Subsequent optical colonoscopy confirmed absence of abnormal colonic changes.Īlthough optical colonoscopy remains the gold standard for diagnosing diseases of the large bowel, radiologic investigation of the colon is currently performed by means of CT colonography (CTC). 2) showed optimal distension of most of the large bowel and disappearance of the above-described finding, consistent with a technical artefact (segmental colonic spasm). Without moving the patient from the scanner table, after repeated pharmacological hypotonisation and further rectal water instillation a second CT acquisition (Fig. At the transition between the distal transverse colon and splenic flexure, a nondistensible 4.5 cm segment showed imaging features strongly suggesting carcinoma including solid enhancing circumferential mural thickening, abrupt “shouldering” transition distally and proximally, and abundant stools upstream. 1) showed well-distended rectosigmoid and descending colon with thin regular walls and haustra, some endoluminal fecal residues. After injection of 20 mg hyoscine N-buthylbromide and retrograde distension with 1 litre of warm tap water, the initial contrast-enhanced CT acquisition (Fig. A day later WE-CTC was performed following limited bowel preparation by means of laxative (sennosides) capsules and magnesium citrate solution. ![]()
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