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Why not the eighth nerve? Neurovascular compression--probable cause for pulsatile tinnitus
Otolaryngology and Head and Neck Surgery
|January 1, 1979
Summary
An atypical trigeminal artery may cause pulsatile tinnitus by compressing the eighth cranial nerve. This vascular anomaly, extending from the carotid artery, was observed in patients with tinnitus.
Area of Science:
- Neuroscience
- Vascular Anatomy
- Otolaryngology
Background:
- Pulsatile tinnitus can have various underlying causes.
- Neurovascular compression of cranial nerves is a recognized etiology for certain neurological symptoms.
Purpose of the Study:
- To investigate a potential vascular anomaly associated with unilateral pulsatile tinnitus.
- To identify the anatomical basis for neurovascular compression in affected patients.
Main Methods:
- Carotid arteriography was performed on three patients presenting with unilateral pulsatile tinnitus.
- Anatomical illustrations and fetal dissection were utilized to examine the vascular and neural structures.
Main Results:
- Atypical trigeminal arteries originating from the internal carotid artery were identified in all three patients.
- This artery was observed to cross the cochlear nerve near its pontine insertion, indicating potential compression.
Conclusions:
- The atypical trigeminal artery represents a potential cause of pulsatile tinnitus.
- Neurovascular compression of the eighth cranial nerve by this anomalous artery is suggested as the underlying mechanism.