Egyptian Journal of Radiology and Nuclear Medicine

Table 4 Surgical correlation with Direct and indirect MRI finding

From: Direct hydrogen peroxide MRI fistulography versus indirect (intravenous) MRI fistulography in patients with perianal fistula

Findings	Direct fistulography				Indirect fistulography
Findings	True positive	True negative	False positive	False-negative	True positive	True negative	False positive	False-negative
Primary tract	33	1	2	1	33	0	3	1
Secondary tract	11	26	0	1	9	24	3	2
abscess	6	27	0	4	10	27	0	0
Internal orifices	41	1	2	1	39	1	2	4

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