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⁾.