Ramsay Hunt syndrome is defined as an acute peripheral facial neuropathy associated with erythematous vesicular rash of the skin of the ear canal, auricle (also termed herpes zoster oticus), and/or mucous membrane of the oropharynx.
This syndrome is also known as geniculate neuralgia or nervus intermedius neuralgia. Ramsay Hunt syndrome can also occur in the absence of a skin rash, condition known as zoster sine herpete. 
Ramsay Hunt syndrome was first described in 1907 by James Ramsay Hunt in a patient who had otalgia associated with cutaneous and mucosal rashes, which he ascribed to infection of the geniculate ganglion by human herpesvirus 3 (ie, varicella-zoster virus [VZV]). 
The following may be observed:
VZV in any of the zoster zones of the head and neck (herpes auricularis, herpes facialis, and herpes occipito-collairs) with facial palsy
VZV in any of the zoster zones with facial palsy and auditory symptoms (eg, tinnitus, deafness, vertigo, nystagmus, ataxia)
Ramsay Hunt syndrome is defined as VZV infection of the head and neck that involves the facial nerve, often the seventh cranial nerve (CN VII). Other cranial nerves (CN) might be also involved, including CN VIII, IX, V, and VI (in order of frequency). This infection gives rise to vesiculation and ulceration of the external ear and ipsilateral anterior two thirds of the tongue and soft palate, as well as ipsilateral facial neuropathy (in CN VII), radiculoneuropathy, or geniculate ganglionopathy.
VZV infection causes 2 distinct clinical syndromes. Primary infection, also known as varicella or chickenpox, is a common pediatric erythematous disease characterized by a highly contagious generalized vesicular rash. The annual incidence of varicella infection has significantly declined after the introduction of mass vaccination programs in most countries of the world. 
After chickenpox, VZV remain latent in neurons of cranial nerve and dorsal root ganglia. Subsequent reactivation of latent VZV can result in localized vesicular rash, known as herpes zoster. VZV infection or reactivation involving the geniculate ganglion of CN VII within the temporal bone is the main pathophysiological mechanism of Ramsay Hunt syndrome.
Ramsay Hunt syndrome is a rare complication of latent VZV infection.  As previously stated, Ramsay Hunt syndrome might occur in the absence of cutaneous rash (zoster sine herpete). Interestingly, VZV has been detected by polymerase chain reaction (PCR) in the tear fluid of patients diagnosed with Bell palsy.  Ramsay Hunt syndrome is estimated to account for 16% of all causes of unilateral facial palsies in children, and 18% of facial palsies in adults. Ramsay Hunt syndrome is rare in children younger than 6 years. 
Ramsay Hunt syndrome is thought to be the cause of as many as 20% of clinically diagnosed cases of Bell palsy. 
The incidence of Ramsay Hunt syndrome among patients with HIV infection is unknown. However, it may occur at a higher rate than in the general population because individuals with HIV infection have a higher risk of VZV infection. 
Ramsay Hunt syndrome is not usually associated with mortality. It is a self-limiting disease; the primary morbidity results from facial weakness. Unlike Bell palsy, this syndrome has a complete recovery rate of less than 50%.
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