Table 3.

Diagnostic accuracy of MRI in detection of abscesses, using surgical findings as reference standard.*

		Surgery
		Yes	No
MRI	Yes	183	10
	No	2	79†

Values are given as n.

*Sensitivity = 0.99, specificity = 0.89, PPV = 0.95, NPV = 0.98, accuracy = 0.96.

^†20 patients surgically confirmed, 59 patients based on clinical assessment.

MRI, magnetic resonance imaging; NPV, negative predictive value; PPV, positive predictive value.