Glasscock-Jackon classification
Glomus jugulare tumors
Classification
Grade I
Small tumor involving jugular bulb, middle ear, and mastoid
Grade II
Tumor extending under internal auditory canal; may have intracranial extension
Grade III
Tumor extending into petrous apex; may have intracranial extension
Grade IV
Tumor extending beyond petrous apex into clivus or infratemporal fossa; may have intracranial extension
Reference(s)
Michael LM, Robertson JH. Glomus jugulare tumors: historical overview of the management of this disease. Neurosurg Focus 2004; 17:E1.