Fisch classification

Glomus jugulare tumors (temporal)

Class A

Tumors limited to middle ear space

Class B

Tumors limited to middle ear or mastoid without involvement of the infralabyrinthine space of the temporal bone

Class C

Tumors involving infralabyrinthine and apical spaces of temporal bone, with extension into the apex

Class D1

Tumors with intracranial extension < 2 cm in diameter

Class D2

Tumors with intracranial extension > 2 cm in diameter

Reference

Michael LM, Robertson JH. Glomus jugulare tumors: historical overview of the management of this disease. Neurosurg Focus 2004; 17:E1.