intercommunication between CN VII and V (III). Assuming the | Figure 1
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intercommunication between CN VII and V (III). Assuming the nerves exchange fibers, it is safe to say that they exchange sensorial information that may be relevant for the outcome. This is a basic plan to understand the scope of orofacial pain. We need to stop extracting and sealing root canals of teeth that are not proven to be the source of the pain. #oro #Facial-nerve-(7th-cranial-nerve) #Trigeminal-nerve-(5th-cranial-nerve) oral maxillofacial
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A1 - (d) Ramsay-Hunt syndrome
A2 - (e) VII (seven)
A3 - (c) Herpes Zoster
Ramsay-Hunt syndrome or herpes zoster oticus is caused by varicella zoster infection involving the sensory fibers of cranial nerves 7, 8, and a portion of the external ear supplied by the auriculotemporal nerve. Pathologic enhancement of multiple nerves both within the IAC fundus and outside the fundus are tip offs to the diagnosis along with external ear vesicles!
The top differential diagnosis is Bell's Palsy which does not have vesicles, does not involve as many cranial nerves, and typically restricts itself to the 7th. Other differential diagnoses include meningitis with meningeal symptoms, sarcoid with multiple bizarre lesions, and meningeal carcinomatosis which is not localized to the cranial nerves. Involvement of the membranous labyrinth, as well as all portions of the facial nerve and other cranial nerves, are important tip offs to the diagnosis of Ramsay Hunt syndrome.
Sagittal oblique high resolution T2 image through the right internal auditory (IAC) canal shows the normal orientation of the 7th (facial) and 8th (vestibulocochlear) cranial nerves. The 7th cranial nerve is positioned anteriorly and superiorly in the IAC (blue arrow). Below it is the cochlear division of the 8th cranial nerve (yellow). This gives rise to the saying “7 up, Coke down” that most radiology residents learn in their training. Posteriorly are the superior and inferior vestibular divisions of the 8th cranial nerve (green). #NeuroWednesday
micro-vascular decompression of the #Glossopharyngeal-nerve-(9th-cranial-nerve)
#Vestibulocochlear-nerve-(8th-cranial-nerve) #Schwannoma
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