A 52-year-old man complains of vague abdominal pain and weight loss.

Fig. 96.1 Contrast-enhanced axial CT images show circumferential thickening of the sigmoid colon (white arrow) associated with adjacent pericolic lymph nodes (black arrow). There are no signs of bowel obstruction.

Lymphoma of the sigmoid colon

• Adenocarcinoma of the sigmoid
  
• Metastases
  
• Infection and inflammatory bowel disease (less likely)
  
• Focal bowel ischemia (less likely)