Table 1. Eden classification of spinal dumbbell tumors based on gross anatomical location.

Classification by Eden et al. [8]

Type	Tumor location
Type I	Intradural and extradural
Type II	Intradural, extradural, foraminal, and paravertebral
Type III	Extradural, foraminal, and paravertebral
Type IV	Foraminal and paravertebral