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Summary of reported cases of primary spinal HPC
| Summary | Liu (9) | Das (11) | Yi (12) | Jia (13) | Wang (14) | Singla (15) | |
|---|---|---|---|---|---|---|---|
| M/Average age | 25/40.3 | 14/29.3 | 3/40.3 | 8/42.6 | 9/50.2 | 6/46.5 | 5/36.8 |
| F/Average Age | 20/33.9 | 12/36.8 | 2/24.5 | 3/41.3 | 11/39.2 | 10/36.7 | 5/32.6 |
| Asia | 2 | 26 | / | 11 | 20 | 16 | / |
| Occident | 42 | / | 5 | / | / | / | 10 |
| Cervical segment | 18 | 10 | 2 | 2 | 6 | 4 | 4 |
| Thoracic segments | 18 | 9 | 3 | 5 | 8 | 9 | / |
| Lumbar segment | 8 | 7 | / | 4 | 5 | 3 | 6 |
| Sacral segment | 1 | 0 | / | / | 1 | / | / |
| Mean follow-up years(y) | 4.03 | 6.57 | 2.15 | 3.39 | 3.19 | 8.03 | 5.43 |
