Fisch classification[1,2] | |
Class A | Tumors that arise along the tympanic plexus on the cochlear promontory |
Class B | Tumors with invasion of hypotympanon; cortical bone over jugular bulb intact |
Class C1 | Tumors with encroachment of the carotid foramen, but no invasion of the carotid artery |
Class C2 | Tumors with destruction of the vertical carotid canal |
Class C3 | Tumors that invade the horizontal portion of the carotid canal, but do not reach the foramen lacerum |
Class C4 | Tumors with growth to foramen lacerum and along the carotid artery and the cavernous sinus |
Class De1/2 | Tumors with intracranial but only extradural extension; De1/2 according to displacement of dura (De1 = less than 2 cm, De2 = more than 2 cm) |
Class Di1/2/3 | Tumors with intracranial and intradural extension; Di1/2/3 according to depth of invasion into posterior cranial fossa (Di1 = less than 2 cm, Di2 = between 2 and 4 cm, Di3 = more than 4 cm |
Jackson/Glasscock classification[3] | |
Type 1 | Small tumor involving the jugular bulb, middle ear, and mastoid process |
Type 2 | Extending under internal auditory canal; may have intracranial extension |
Type 3 | Extending into petrous apex; may have intracranial extension |
Type 4 | Extending beyond petrous apex into clivus or infratemporal fossa; may have intracranial extension |
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