Table 2.

Fisch classification for GJs.

Class	Paraganglioma location
A	Tumor arises on promontory
B	Tumor with invasion of hypotympanon; cortical bone over jugular bulb intact
C	Tumor with invasion beyond typanomastoid cavity with destruction of infralabyrinthine and apical temporal bone
C1	Tumor with erosion of carotid foramen
C2	Tumor with destruction of carotid canal
C3	Tumor with invasion of the horizontal part of carotid canal; foramen lacerum intact
C4	Tumor with invasion of foramen lacerum and cavernous sinus
D	Tumor invades intracranially
D1	Tumor with intracranial but extradural extension
D2	Tumor with intracranial and intradural extension