Case
Case 1
A 24-year-old male presented with a 3-day history of vertigo, along with a 2-day history of left-side otalgia, sore throat, and hoarseness. A few vesicles were observed on the left external auditory canal and tympanic membrane. Several vesicles were also observed on the left soft palate and the uvula was deviated to the right during phonation. The gag reflex on the left side was also decreased. Telelaryngoscopic examination revealed erythema and white exudate covering the mucosa over the left arytenoid, accompanied by vocal cord palsy. Right-beating spontaneous nystagmus was grade III, as well as 39% caloric weakness on the left side was revealed on videonystagmography. There was also mild sensory neural hearing loss in the left ear. On serologic test, the immunoglobulin (Ig)M antibody against VZV was positive, whereas the IgG antibody was negative. MRI with gadolinium enhancement of the brain revealed no abnormal lesions. Under the impression of herpes zoster oticus with multiple CN involvement (VIII, IX, X), oral famciclovir and prednisolone therapy were applied. Oral steroid (Solondo®, prednisolone; Yuhan Corporation, Seoul, Korea) was used 60 mg/day for 5 days, then tapered during next 5 days. Oral famciclovir (Famvics®, famciclovir; Yuhan Corporation) was used 750 mg/day for 7 days. For dizziness control, Alevert® (dimenhyrinate 40 mg with cinnarizine 20 mg; Unipharm Korea, Seoul, Korea) was used twice a day. After 2 weeks, delayed left-side facial paralysis (House-Brackmann grade II) occurred (Fig. 1A). We applied additional steroid pulse therapy for delayed facial paralysis. Steroids were used at the same dose as the initial treatment. Dizziness, ear fullness, and facial paralysis in the patient were improved after additional steroid pulse therapy (Fig. 1B). Pure tone audiometry showed 10 dB of hearing gain after two months, which is in normal range. However, vocal cord palsy still persisted as intermediate palsy state after 6 months (Fig. 2A).
Case 2
A 52-year-old female was admitted to our clinic with sore throat, globus sensation, and dysphagia for 2 days. She had diabetes mellitus type 2 and chronic hepatitis B infection. On the telelaryngoscopic examination, several vesicles were revealed on the right side of the pharynx, accompanied by right vocal cord palsy (Fig. 2B). A physical examination revealed vesicular eruption on the right-sided auricle. The patient did not have any other symptoms, such as otalgia, facial weakness, hearing impairment, or dizziness. No definite abnormal findings were found on neck and chest CT scan and brain-temporal MRI. On serologic test, IgM and IgG antibodies against varicella-zoster were negative. However, a serum polymerase chain reaction test for VZV was positive. The patient was given intravenous (IV) acyclovir and high dose prednisolone therapy. Oral steroid (Solondo®, prednisolone) was used 60 mg/day for 5 days, then tapered during next 5 days. IV antiviral agent (Zoylex®, acyclovir; Korea United Pharm, Seoul, Korea) was used 750 mg/day for 5 days and changed to oral agent (Famvics®, famciclovir) 750 mg/day for next 2 days. At 5 days after therapy, vocal cord palsy and pharyngeal vesicles were improved and the patient was discharged without any complication. However, three weeks from symptom onset, the patient began to complain of an additional symptom of right-sided facial palsy of House-Brackmann grade III. There was no vesicle or skin lesion on the right ear. Therefore, additional prednisolone with acyclovir therapy was given for one week. Steroids were used at the same dose as the initial treatment, and IV antiviral agent (Zoylex®, acyclovir) was used 750 mg/day for 5 days. Then, two weeks after facial paralysis, sudden tinnitus in the right side and vertigo occurred. On neurologic examination, spontaneous nystagmus to the left side of grade II was revealed and videonystagmography showed 69% of caloric weakness on the right side. Hearing impairment was not observed on pure tone audiometry. Since, there were no evidence to suggest the central origin lesion with physical examination and videonystagmography, serial MRI was not taken. Under the impression of delayed RHS with multiple neuropathies, we started one more cycle of acyclovir and prednisolone therapy. After 6 months, right-sided facial palsy and vocal cord palsy recovered completely and the patient did not have any dizziness, tinnitus, dysphagia, or skin lesion.
Discussion
RHS with multiple CN involvement and delayed facial paralysis is a rare occurrence, and there is limited information regarding the disease. Both patients fully recovered from delayed facial paralysis, which was the characteristic in both cases. Multiple CN palsy was improved in the two cases except for right vocal cord palsy in case 1. In the previous case reports, polyneuritis may occur ascending, descending on the progress, or not described [6]. From this point of view, the course of symptoms may vary from person to person; therefore, the symptom manifestation might be different in the two cases. However, delayed facial palsy was not severe in both cases; it was below House-Brackmann grade III, and they recovered.
RHS is an infectious disease caused by the VZV [1]. The reason for the slowly developed facial paralysis was probably the result of reactivation of the VZV that remained dormant in the nerve root ganglion. Analysis of the VZV DNA in the dorsal root ganglia from a person with zoster showed that viral DNA was present in both the neurons and satellite cells of ganglia innervating the sites of reactivation [7]. Close anatomic relationship between CN can cause the symptom of polyneuropathy [2]. Trigeminal and vestibulocochlear nerves and spinal ganglia C2-C4 are known to be the commonly affected nerves [8]. Severe inflammation in one ganglion can spread to another adjacent ganglion. It can also cause infarction by invading microvascular structures that have a common distribution in other brain nerves. VZV can directly invade the brainstem parenchyma by way of nerve axons or via synapses [9]. Recently, a hypothesis that, VZV causes synaptic conduction along the reflex pathways of the brainstem, causing multiple neuropathy, has also been raised [10].
The etiology of facial paralysis in RHS may be caused by VZV infection. The facial nerve is composed of two sensory branches. They are responsible for the general sense of the pinna and the taste of the tongue. The VZV may invade the sensory branches of the facial nerve and penetrate to the geniculate ganglion. When the virus is reactivated, the inflammation of adjacent motor branches of the facial nerve leads to facial paralysis. This phenomenon explains the mechanism of RHS (facial nerve palsy with zoster oticus) [11].
On serologic test, case 1 showed a positive result for IgM and a negative result for IgG, while both IgM and IgG were negative in case 2. The positive rate of serum VZV IgM in patients with RHS was reported to be significantly higher (30.8%) than that in patients with Bell’s palsy (9.8%) [12]. Serologic screening for IgG against VZV will aid in identifying nonimmune individuals. The presence of IgM against VZV is suggestive of an acute or recent infection. However, results should be correlated with the clinical presentation because the patient’s symptoms are the most important criteria in RHS diagnosis.
RHS with multiple CN palsy has rarely been reported [13-15]. Kim, et al. [3] reported 11 patients with 10 years of RHS with polyneuritis, and the frequency of CN involvement was VII, VIII, IX, X, and V in that order. Shim, et al. [13] reported 11 cases for 15 years, and the following CN VII, VIII nerves, the frequency of other CN was CN X, IX, and V in that order. In a paper analyzing RHS with polyneuritis combined with vocal cord palsy (CN X) reported in the literature for 50 years; of the 14 patients, the incidence was CN VII, VIII, IX, V, and XII [4]. There are few prospective controlled studies for RHS with multiple CN involvement in the medical literature. The actual management starts with a combination of an antiviral agent and steroids. We used an antiviral agent and steroids as the initial treatment. In the event of delayed facial paralysis, an additional antiviral and steroid treatment was applied. After the second treatment, delayed facial paralysis recovered, which means that delayed infection is considered to have a lower level of inflammation. Therefore, immediate antiviral agent or steroid treatment is required when recurrent symptoms appear.
RHS is known to have a poorer prognosis than Bell’s palsy. Peitersen reported the recovery rate in 1701 cases of Bell’s palsy and 116 cases of herpes zoster. In the Bell’s palsy group, recovery was found in 83% of patients, but the recovery rate was only 46% in the RHS group and the remaining patients showed moderate to high sequelae. The prognosis of multiple cranial neuritis is still controversial. Kim, et al. [3] reported that facial palsy was improved satisfactorily, and the remaining symptoms except for CN VIII recovered well. Shim, et al. [13] reported that only 6 of the 11 patients had improved symptoms, and the recovery rate of facial palsy (54.5%) was worse than that in the simple RHS group (82.9%). Rasmussen reported that recovery of vocal cord paralysis was found in only 4 of 14 patients (28.6%), and facial paralysis was the same [4]. The above studies showed a difference in the recovery rate when facial paralysis occurred in the early stages. However, in our cases, the degree of facial paralysis was not severe as grade III or less, and recovery was observed after treatment.
To our knowledge, these are the interesting cases in the literature to report RHS with delayed facial paralysis and its favorable recovery. It will be a good example for expanding the possibility of treatment in RHS with multiple CN palsy.
In conclusion, delayed facial paralysis can develop in RHS with multiple cranial polyneuritis after several weeks from the onset. Therefore, physicians should keep in mind the possibility of delayed facial paralysis and the need for proper treatment.