The glomus tumour invasion of jugular bulb is diagnosed by
Carotid angiography
Veebral venous venography
X-ray
Jugular venography
Jugular venography must be done to delineate multiple tumours, feeding vessels, embolization and involvement of jugular bulb, carotid aery or intradural extension. Ref: Dhingra 6th edition pg. 110
Ear