Lymphomatous involvement of gastrointestinal tract: Evaluation by positron emission tomography with 18F-fluorodeoxyglucose

Figure 1 A 61-year-old woman with large cell lymphoma. A: Pre-treatment ¹⁸F-FDG PET scan revealed multifocal hypermetabolic activity involving the neck, chest, and abdomen (arrow). The highest SUV_max was 20.3 in the left upper abdominal area, corresponding to a positive result of a gastric biopsy; B: Follow-up ¹⁸F-FDG PET scan 5 mo later showed no evidence of residual FDG disease.

Figure 2 A 68-year-old man with large cell lymphoma. A: Base line ¹⁸F-FDG PET scan showed hypermetabolic foci in the stomach (white arrow), cecum and terminal ileum (black arrow), and bowel loops (SUV_max = 12.7); B: ¹⁸F-FDG PET scan obtained after therapy showed partial metabolic response of the activity in the stomach (white arrowhead) and cecum (black arrowhead, SUV_max = 10.7).

Figure 3 An 80-year-old man with MALT-type lymphoma. A-C: ¹⁸F-FDG PET scans in transaxial and projection images showed a focal mild hypermetabolic activity (SUV_max = 3.8) in the region of stomach (black arrow); D and E: CT scans showed a bulky mass in the wall of gastric fundus and body (white arrow).

Figure 4 A 78-year-old man with mantle cell lymphoma. A: ¹⁸F-FDG PET scan revealed multiple hypermetabolic foci involving the lower esophagus (thick arrow), gastric fundus (thin arrow), cecum and terminal ileum (arrow head); B and C: The corresponding CT scans of the abdomen showed wall thickening at the gastric fundus (white arrow) and the cecum and terminal ileum (white arrow head)