Glomus tumor invading the veical pa of carotid canal. It is

Ans. is 'c' i.e., Type C2 Fisch classification The Fisch classification of glomus tumors is based on extension of the tumor to surrounding anatomic structures and is closely related to moality and morbidity. Type A :- Limited to middle ear cleft (glomus tympanicum). Type B :- Limited to tympanomastoid area with no involvement of infralabyrinthine compament. Type C :- Involving infralabrinthine compament extending upto petrous apex Type C1 :- Limited involvement of veical poion of carotid canal Type C2 :-Invading veical poion of carotid canal Type C3 :-Invasion of horizontal poion of carotid canal Type D Intracranial extension Type D1 Intracranial extension < 2 cm in diameter Type D2 :-Intracranial extension > 2 cm in diameter