CT colonography after incomplete colonoscopy in subjects with positive faecal occult blood test

Figure 1 Adenomatous polyp of 13 mm of the ascending colon in a 61-year-old female with initial colonoscopy interrupted at the descending colon for severe discomfort. A: Endoluminal CT image of the ascending colon shows 13 mm sessile polyp lying on a fold; B and C: Axial CT images acquired in supine and prone position show the polypoid lesion (arrow) on a fold; D: Sessile polyp of 13 mm of the ascending colon found at repeat colonoscopy. Histology evaluation revealed adenomatous polyp.

Figure 2 Stenosing mass of the proximal sigmoid colon in a 69-year-old female with initial colonoscopy interrupted at the distal sigmoid colon for diverticular disease. A: Axial CT image acquired in prone decubitus shows a stenosing lesion of the proximal sigmoid colon with CT findings suspicious for malignancy: eccentric wall thickening, “shoulder sign”, absence of pericolonic fat stranding; B: Coronal oblique multiplanar reformation shows the lesion in the sigmoid colon; C: Endoluminal CT image shows the passage from the normal colonic wall to the stenosis; D: Surgical specimen from left hemicolectomy shows a stenosing lesion of about 5 cm in the proximal sigmoid colon with marked wall thickening due to advanced diverticular disease confirmed at histological evaluation.