Table 1. Number of operations, clinical outcome, follow-up, and recurrence rates.
| Cyst location | No. of cases | No. of operations | Clinical outcome | Follow-up median (range) | Recurrence n (%), Δt median (range) | ||
| Intradural- | 30 | 1 op.: 28 | (93%) | complete recovery: | 17 (68%) | 10 months | yes: 3 (15%), at |
| Extramedullar CE | 2 op.: 2 | (7%) | partial recovery: | 5 (20%) | (2–18) | 1.5, 7 & 12 months | |
| [BL type 2] | paraparesis: | 3 (12%) | no: 17 (85%) | ||||
| no data: | 5 | no data: 18 | no data: 10 | ||||
| Extradural extraossous | 70 | 1 op.: 46 | (78%) | complete recovery: | 23 (40%) | 19 months | yes: 12 (27%), |
| CE | 2 op.: 10 | (17%) | nearly compl. recov.: | 7 (12%) | (6–108) | at 22months | |
| (epidural [BL type 3]-, | 3 op.: 1 | (2%) | recovery unspecif.): | 4 (7%) | (8–48 m) | ||
| paravertebral [BL type | 6 op.: 1 | (2%) | partial recovery: | 9 (16%) | no: 32 (73%) | ||
| 5]-, ‘dumbbell’-, & | multiple: 1 | (2%) | paraparesis: | 9 (16%) | |||
| posterior paraspinal | paraplegia: | 4 (7%) | |||||
| muscle cysts) | fatal postop. complication: | 1 (2%) | |||||
| no data: | 11 | no data: | 16 | no data: 36 | no data: 22 | ||
| Vertebral/osseous CE | 169 | 1 op.: 76 | (62%) | complete recovery: | 35 (33%) | 24 months | yes: 50 (48%), |
| [BL type 4 & cases | 2 op.: 22 | (18%) | nearly compl. recov.: | 5 (5%) | (2–144) | at 24 months | |
| with involvement of | 3 op.: 13 | (11%) | recovery (unspecif.): | 5 (5%) | (3–156) | ||
| posterior vertebral | 4 op.: 1 | (1%) | partial recovery: | 32 (30%) | no: 53 (52%) | ||
| elements] | 5 op.: 6 | (5%) | monoparesis: | 1 (1%) | |||
| 6 op.: 2 | (1%) | paraparesis: | 8 (7%) | ||||
| 7 op.: 1 | (1%) | paraplegia: | 17 (16%) | ||||
| 8 op.: 1 | (1%) | tetraplegia: | 1 (1%) | ||||
| death: | 3 (3%) | ||||||
| no data: | 47 | no data: | 62 | no data: 113 | no data: 71 | ||
BL: Braithwaite & Lees classification.