Table 1:

Enhancement characteristics of intramedullary spinal cord metastases and primary masses (per-lesion basis)

	Intramedullary Spinal Cord Metastases (n = 64)	Primary Spinal Cord Masses (n = 64)	Ependymoma (n = 21)	Astrocytoma (n = 21)	Hemangioblastoma (n = 11)	Ganglioglioma (n = 5)	Cavernous Malformation (n = 6)
No enhancement	1 (2%)	10 (16%)	0	6 (29%)	0	1 (20%)	3 (50%)
Rim sign	21 (33%)	2 (3%)	0	0	2 (18%)	0	0
Flame sign	19 (30%)	2 (3%)	1 (5%)	1 (5%)	0	0	0
Rim without flame sign	9 (14%)	2 (3%)	0	0	2 (18%)	0	0
Flame without rim sign	7 (11%)	2 (3%)	1 (5%)	1 (5%)	0	0	0
Only rim or flame signa	16 (25%)	4 (6%)	1 (5%)	1 (5%)	2 (18%)	0	0
Both rim and flame signs	12 (19%)	0	0	0	0	0	0
At least rim or flame signb	28 (44%)	4 (6%)	1 (5%)	1 (5%)	2 (18%)	0	0

^aSum of the 2 preceding rows (lesions that demonstrated only 1 of the 2 signs).

^bSum of the 2 preceding rows (lesions that demonstrated at least 1 of the 2 signs, whether alone or in combination with the other sign).