"Solutions: contrast enhancement may be used as a problem solving tool when a potential flat lesion is found and there are doubts."
"Solutions: when bubbles are present with no surrounding fluid, they may be best resolved on 2D images with wider colon or bone window settings 3."
"Solution: Good preparation, which should include a combination of a low-residue diet (no vegetables or fruit during the three days before the examination), and faecal/fluid tagging the day before CT colonography. Faecal tagging consists of drinking positive contrast (e.g. Gastrografin) the day before CT colonography (suggested amount 180 mL of contrast with some water). This allows for differentiation between tagged food residue and a true non-tagged polyp 3."
"Solution: Meticulous inspection, using 3D endoluminal and 2D views would be of value. This can be done by turning the virtual camera in a retrograde direction to inspect the “pericatheter” segment. Also, it is advised to deflate the balloon immediately before starting the prone acquisition to avoid compression of lesions by the balloon of the catheter 1."
"Solution: Optimal colonic distension is crucial to flatten the semilunar folds. This can be obtained by combining smooth muscle relaxation, colonic insufflation with a CO2 injector and dual positioning (i.e., acquisition in the supine and prone position) 1."
"Solution: The thickening frequently presents with a lipomatous density representing the pericolonic structures. In 3D, this thickening is regular and smooth. Also, the thickened fold frequently has a different aspect between the supine and prone acquisition."
"Solution: It is mandatory to define the structure of the ileocaecal valve by defining both lips of the valve (particularly on coronal reformatted images). Moreover, there is a change in aspect between supine and prone acquisition."
"Solution: This can be confirmed by localising the appendix on the coronal and sagittal reformats. Also, the appendiceal orifice can be confirmed on the endoluminal 3D views. Any history of appendicectomy can be obtained from the patient before the examination."
"The ileocaecal valve may be lipomatous (density between 0 and −100 HU) or papillary (mixed density). When enlarged, it gives a pseudotumoral appearance 4 ."
"Solutions: contrast enhancement may be used as a problem solving tool when a potential flat lesion is found and there are doubts."
"Solutions: when bubbles are present with no surrounding fluid, they may be best resolved on 2D images with wider colon or bone window settings 3."
"Solution: Good preparation, which should include a combination of a low-residue diet (no vegetables or fruit during the three days before the examination), and faecal/fluid tagging the day before CT colonography. Faecal tagging consists of drinking positive contrast (e.g. Gastrografin) the day before CT colonography (suggested amount 180 mL of contrast with some water). This allows for differentiation between tagged food residue and a true non-tagged polyp 3."
"Solution: Meticulous inspection, using 3D endoluminal and 2D views would be of value. This can be done by turning the virtual camera in a retrograde direction to inspect the “pericatheter” segment. Also, it is advised to deflate the balloon immediately before starting the prone acquisition to avoid compression of lesions by the balloon of the catheter 1."
"Solution: Optimal colonic distension is crucial to flatten the semilunar folds. This can be obtained by combining smooth muscle relaxation, colonic insufflation with a CO2 injector and dual positioning (i.e., acquisition in the supine and prone position) 1."
"Solution: The thickening frequently presents with a lipomatous density representing the pericolonic structures. In 3D, this thickening is regular and smooth. Also, the thickened fold frequently has a different aspect between the supine and prone acquisition."
"Solution: It is mandatory to define the structure of the ileocaecal valve by defining both lips of the valve (particularly on coronal reformatted images). Moreover, there is a change in aspect between supine and prone acquisition."
"Solution: This can be confirmed by localising the appendix on the coronal and sagittal reformats. Also, the appendiceal orifice can be confirmed on the endoluminal 3D views. Any history of appendicectomy can be obtained from the patient before the examination."
Expected headings
"Common pitfalls"
"Flat polyps"
"Gas bubbles"
"Sticky solid colonic residue"
"Rectal catheter"
"Spasm"
"Flexural pseudotumour"
"Enlarged ileocaecal valve"
"Appendicular impression"