Contraindications

The contraindications to CTC are few and, in general, different than these encountered with conventional colonoscopy (Rex et al. 1987). Weight and girth limitations of the scanner, artifacts from metal prosthesis and claustrophobia are examples of contraindications unique to CT. Absolute contraindications to instrumentation of the colon include presence of an acute abdomen, recent abdominal or pelvic surgery, colonic hernia, and acute diverticu-litis (Fig. 2.3). Relative contra-indications include pregnant patients, patients with hip replacements, claustrophobia and an incompetent ileocecal valve (Fig. 2.4).

Fig. 2.3a,b. Left inguinal colonic hernia: a supine CT image (lung window setting) shows loops of bowel presumed to represent colon in a left inguinal hernia; b sagittal reformatted CT image shows distended colon within a left inguinal hernia

Fig. 2.3a,b. Left inguinal colonic hernia: a supine CT image (lung window setting) shows loops of bowel presumed to represent colon in a left inguinal hernia; b sagittal reformatted CT image shows distended colon within a left inguinal hernia a

Fig. 2.4a,b. Incompetent ileocecal valve: a axial CT image (soft tissue window) demonstrates a gaping ileocecal valve (arrow); b coronal reformatted CT image lung window settings shows gas filled and distended loops of small bowel and colon

Fig. 2.4a,b. Incompetent ileocecal valve: a axial CT image (soft tissue window) demonstrates a gaping ileocecal valve (arrow); b coronal reformatted CT image lung window settings shows gas filled and distended loops of small bowel and colon b a b a

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