Table 1.

Results of different magnetic resonance sequences and their agreement (Cohen’s kappa) to reference tests in the depiction of different components of fistula-in-ano

Sequence	Tract extension	Internal opening	Active inflammation
T2 weighted
2D TSE	1.00	0.88	0.88
3D TSE	0.88	0.70	0.62
STIR	0.19	0.31	0.63
2D TSE with fat sat	0.54	0.54	0.54
T1 weighted
3D T1 weighted with fat saturation	0.94	0.97	0.94
SPIR	0.71	0.66	0.87

2D: Two dimensional; 3D: Three dimensional; TSE: Turbo spin-echo; STIR: Short tau inversion recovery; SPIR: Spectral presaturation with inversion recovery.