The glomus tumour invasion of jugular bulb is diagnosed by
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
Carotid angiography
Veebral venous venography
X-ray
Jugular venography
Ear