Table 3. Causes for Conversion to Surgery in the Initially Conservative Group.

Case	Initial SINS	Preop SINS	Lesion	Reason for surgery
1	9	9	L2	Neurologic Sx
2	8	9	L4	Neurologic Sx
3	12	13	T4	Neurologic Sx
4	8	8	T4	Neurologic Sx
5	11	11	T10	Neurologic Sx
6	8	10	L4	Neurologic Sx
7	9	9	T2	Neurologic Sx
8	10	11	T3	Neurologic Sx
9	11	11	C2	Neurologic Sx
10	11	11	T6	Neurologic Sx
11	12	12	T10	Severe back pain
12	9	10	C7	Severe back pain
13	8	8	L1	Severe back pain
14	11	13	T11	Severe collapse & pain

SINS: spinal instability neoplastic score, Preop: preoperative, Sx: symptom.