Samii Jugular foramen schwannoma classification system

A Tumor arising from cisternal part of the nerves, without significant extension into the Jugular foramen

B

B1 Intraosseous tumor inside the JF

B2 Intraosseous tumor with significant extension into the cisternal space

B3 Intraosseous tumor with significant extension into the infratemporal fossa

C Tumor arising from the peripheral part of the nerve (extracranial type)

D Triple dumbbell-shaped tumor with intracranial, intraosseous and extracranial parts 1).

1)
Samii M, Alimohamadi M, Gerganov V. Surgical Treatment of Jugular Foramen Schwannoma: Surgical Treatment Based on a New Classification. Neurosurgery. 2015 Sep;77(3):424-32; discussion 432. doi: 10.1227/NEU.0000000000000831. PubMed PMID: 26075309.