Brief Answer:
It will help in studying arterial and venous abnormalities

Detailed Answer:
Hi,
Thanks for writing in to us.

MRI contrast scan of the IAC will show the vessels surrounding the IAC in detail. Vessels mean ateries and veins. Therefore the IAC contrast MRI should be showing venous abnormalities involving the cerebello pontine angle area which is near the IAC area.

Please do write back if you have any particular details regarding your clinical condition.

Regards,

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Brief Answer:
Please find most benign causes of pulsatile tinnitus in the following

Detailed Answer:
Hi,
Thanks for writing in.

Usually CT scan and CT angiography are reserved for suspected problems in the bone and if there is a possible vascular lesion.

MRI of the IAC is the preferred examination when a problem is suspected in the nerve pathways and CT is not as good for this purpose.

Causes for pulsatile tinnitus are the following
Tympanic cavity pathology
Temporal bone pathology, e.g., otosclerosis (benign), Paget disease (benign), and LCH (malignant)
Paraganglioma (malignant)
Hypervascular metastasis or meningeoma (malignant)
Vascular channel dehiscence or variant (benign)
Aberrant ICA or stapedial artery (benign)
Vascular loops, neurovascular conflict (benign)
Arteriovenous fistula (benign)
Arteriovenous malformation superficial (benign)
Vessel wall pathology, e.g., atherosclerosis, FMD, or dissection (benign)
Idiopathic intracranial hypertension (benign)

Regards,

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