Table 2 Sridhar classification of spinal schwannomas [7]
From: Giant sacral schwannoma in a neurofibromatosis type 2 patient
Classification | |
|---|---|
Type 1 | |
Type 1a | Intradural intraspinal tumor, < 2 vertebral segments in length |
Type 1b | Extradural intraspinal tumor, < 2 vertebral segments in length |
Type 2 | Intraspinal tumor > 2 vertebral segments in length—giant tumor |
Type 3 | intraspinal tumor with extension into nerve root foramina |
Type 4 | |
Type 4a | Intraspinal tumor with extraspinal extension of < 2.5 cm |
Type 4b | Intraspinal tumor with extraspinal extension of > 2.5 cm—giant tumor |
Type 5 | Tumor with erosion into the vertebral bodies (giant invasive tumor) as well as lateral and posterior extensions into myofascial planes |