FISCH classification is used for: (A) Juvenile nasopharyngeal angiofibroma, (B) Nasopharyngeal carcinoma, (C) Vestibular schwannoma, (D) Glomus tumor
Answer is D. FISCH classification is used for glomus tumours based on the extension into surrounding anatomic structures. Type A tumour - Tumour limited to the middle ear cleft (glomus tympanicum) Type B tumour - Tumour limited to the tympanomastoid area with no infralabyrinthine compament involvement Type C tumour - Tumour involving the infralabyrinthine compament of the temporal bone and extending into the petrous apex; Type C1 tumour - Tumor with limited involvement of the veical poion of the carotid canal; Type C2 tumour - Tumour invading the veical poion of the carotid canal; Type C3 tumour - Tumour invasion of the horizontal poion of the carotid canal Type D1 tumour - Tumour with an intracranial extension less than 2 cm in diameter; Type D2 tumour - Tumour with an intracranial extension greater than 2 cm in diameter