Situated at the left common carotid artery bifurcation.
What is the lesion like?
Enhancing soft tissue tumor splaying the internal and external carotid arteries.
Click here to see more imagesWhat MRI signal characteristics shows the lesion?
Hyperintense on the STIR with dark foci giving salt and pepper appearance. Hypointense on T1.
What is the differential diagnosis?
Carotid body tumor: glomus tumor or paraganglioma of the carotid body. It characteristically splays the internal and external carotid arteries. Vagal schwannoma: tends to displace both arteries together to one side. Glomus vagale: paraganglioma with the same signal characteristics as the carotid body paraganglioma but is located more superiorly at the skull base and may extend into the jugular foramen.
There is a small lucency anterior to the vestibule, just lateral to the basal turn of the cochlea. Consistent with fenestral otosclerosis.
There are two types of otosclerosis:
1- Fenestral: is the most common type. It involves the bone anterior to the oval window and causes conductive hearing loss.
2- Retro-fenestral: involves the cochlear capsule and causes sensorineural hearing loss.
The two types can occur simultaneously.