n (%)

Spine degenerative diseases

Spinal trauma

Brain tumors

Subdural hematoma

Scalp tumors

Brain trauma

Hydrocephalus

Epidural hematoma

Parenchymal hematoma

Spinal malformations

Infectious deseases

Hardware removal

24 (40)

11 (18.3)

6 (10)

5 (8.2)

4 (6.7)

3 (5)

2 (3.3)

1 (1.7)

1 (1.7)

1 (1.7)

1 (1.7)

1 (1.7)