====== 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
((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.
)).