Table 5 Detection of collections defined as cavities of > 3 mm in diameter using different MRI pulse sequences
From: Preoperative MRI of perianal fistula evaluation and its impact on surgical outcome
MRI pulse sequences | Positive | Negative | Sensitivity | Specificity | Accuracy | ||
|---|---|---|---|---|---|---|---|
True | False | True | False | ||||
T1 post-contrast | 11 | 6 | 38 | 10 | 52.4% | 86.4% | 75.4% |
STIR | 13 | 6 | 38 | 8 | 61.9% | 86.4% | 78.5% |
DW-MRI | 17 | 5 | 39 | 4 | 81% | 88.6% | 86.2% |
DW-MRI + T1 post-contrast | 18 | 5 | 39 | 3 | 85.7% | 88.6% | 87.7% |
DW-MRI + STIR | 20 | 4 | 40 | 1 | 95.2% | 91% | 92.3% |
All sequences | 21 | 3 | 41 | 0 | 100% | 93.2% | 95.4% |