Fig. 3

Symmetric intestinal mural thickening and double ring sign. Intestinal tuberculosis (ITB) in a old man with a history of left lower quadrant (LLQ) pain and abdominal distension for 20 days. a,b: Multi-slice computed tomography enterography (MSCTE) showed multiple segmental symmetric intestinal mural thickening with irregular ill-defined margins, and avidly enhancing intestinal mucosa. c: symmetric intestinal mural thickening confirmed as circumferential ulcer in the gross specimen. d: as a result of the distal small bowel obstruction, the intestinal wall was swollen and appeared as “double ring sign” (hyperenhancing intestinal mucosa and muscularis) after contrast enhancement (white arrow)