PMC4204688_01
Colonoscopic findings. Colonoscopy shows a well-demarcated, shallow ulcerative lesion with polypoid growth involving the entire circumference of the rectal lumen (A). In addition, loss of vascular pattern and the presence of mucopus coating and edema were noted (B).
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F1
Loss of vascular pattern, edema, and mucopus coating in the distal sigmoid colon and the upper rectum were also seen (Fig. 1).
Abdominal CT findings. CT reveals concentric wall thickening with enhancement in the rectum (A) and enlargement of the regional lymph nodes (B).
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F2
However, abdominal CT revealed thickening of the concentric wall with enhancement in the rectum and enlargement of the regional lymph nodes (Fig. 2).
Fluorine-18-fluorodeoxyglucose (FDG)-positron emission tomography/CT findings. PET/CT reveals increased FDG uptake in the rectum and regional lymph nodes.
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F3
Fluorine-18-fluorodeoxyglucose (FDG)-positron emission tomography (PET)/CT revealed increased FDG uptake in the lower rectum and regional lymph nodes (Fig. 3).
Histopathological findings of the rectum. Histopathological examination of the resected specimen reveals thickening of the muscularis mucosa and fibromuscular obliteration of the lamina propria (A). Crypt abscesses, focal gland destruction, and increased inflammatory cells in the lamina propria are also seen (B) (H&E stain, x100).
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F4
Histopathological examination of the resected specimen revealed fibromuscular obliteration of the lamina propria, thickening of the muscularis mucosa, crypt abscesses, focal gland destruction, and increased inflammatory cells in the lamina propria (Fig. 4).