Table 2.

MR enterographic assessment of Crohn's disease activity compared with histologic reference standard.

Number of subjects	21
Total number of bowel segments	53
-Endoscopic biopsy	16
-Surgical resection	37
Bowel segment locations:
-Small bowel upstream of TI	12
-Terminal ileum	18
-Cecum/ascending colon	12
-Transverse/descending colon	8
-Rectosigmoid	2
Detecting active inflammation (compared with biopsy or surgical excision histology):
Accuracy	86.7%* (46/53; P < 0.001)
Sensitivity	90.0%
Specificity	82.6%
Detecting mural fibrosis (overall, compared with surgical excision histology):
Accuracy	64.9% (24/37; P = 0.082)
Sensitivity	58.3%
Specificity	76.9%
Detecting mural fibrosis (excluding cases with co-existing active inflammation):
Accuracy	88.2%* (15/18; P = 0.013)
Sensitivity	83.3%
Specificity	83.3%