What is the most likely diagnosis?
Vagal nerve schwannoma
What is the differential diagnosis? and how could you differentiate them?
The main differential diagnosis at such location is the vagal paraganglioma; however, schwannoma shows moderate enhancement while paraganglioma shows avid enhancement.
A well-defined encapsulated right carotid space mass lesion is seen measuring 3.5 x 5 cm.
It shows T1 low signal and T2 heterogeneously high signal. It shows moderate enhancement. It exhibits diffusion restriction and ADC value of 1.3 x 10 -3 mm2/sec.