Changing paradigms in evaluating adrenal incidentalomas: Bayesian evaluation of [18F]Fluorodeoxyglucose positron emission tomography use, honed on adrenocortical carcinoma

Table 1 Diagnostic characteristics of [¹⁸F]Fluorodeoxyglucose positron emission tomography according to adrenal incidentaloma size in computed tomography scans size and unenhanced computed tomography density in Hounsfield units

CT		[18F]FDG PET
Pre-test probability of ACC (%)		Sensitivity (%)	Specificity (%)	LR+ (95%CI)	LR- (95%CI)	Post-test probability of ACC (%)
Incidentaloma diameter		90	73	3.33 (3.26-3.40)	0.14 (0.11-0.16)	Test (+)	Test (-)
< 4 cm	0.1					0.1	0.0
4-6 cm	2.4					8.0	0.0
> 6 cm	19.5					45.0	3.0
Incidentaloma unenhanced density						Test (+)	Test (-)
< 10 HU	0.0					0.0	0.0
10-20 HU	0.5					2.0	0.0
> 20 HU	6.3					18.0	1.0

[¹⁸F]FDG PET: [¹⁸F]Fluorodeoxyglucose positron emission tomography; CT: Computed tomography; HU: Hounsfield units; ACC: Adrenocortical carcinoma; LR+: Likelihood ratio of a positive test; LR-: Likelihood ratio of a negative test.