Table 3. Comparison of ¹⁸F-FDG PET/CT and MRI in diagnosis of SLM.

Imaging modalities	Patients with SLM (n=16)			Patients without IM (n=37)		Sensitivity (%)	Specificity (%)	Accuracy (%)
	Positive	Negative		Negative	Positive
PET/CT	14	2		33	4	87.5	89.2	88.7
MRI	12	4		37	0	75.0	100.0	92.5

The sensitivity, specificity and accuracy difference between PET/CT and MRI was not significant, P values were 0.654, 0.115, and 0.506, respectively. ¹⁸F-FDG, ¹⁸F-fluorodeoxyglucose; PET, positron emission tomography; CT, computed tomography; MRI, magnetic resonance imaging; SLM, spinal leptomeningeal metastasis; IM, intraspinal metastasis.