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Table 4 Glasscock-Jackson classification of GTP

From: External and middle ear diseases: radiological diagnosis based on clinical signs and symptoms

Type Description
Type I Small mass limited to cochlear promontory
Type II Tumour completely filling middle ear space
Type III Tumour filling middle ear and extending into mastoid air cells
Type IV Tumour filling middle ear, extending into mastoid air cells or through
Tympanic membrane to fill external auditory canal; may extend anteriorly to the carotid artery