Abstract
West Nile virus (WNV) is an arthropod borne neurotropic single stranded RNA flavivirus with <1% developing presenting with neurological disease. Immunocompromised and elderly patients are more prone to developing WNV meningitis or encephalitis. Definitive diagnosis of WNV meningoencephalitis is a combination of clinical suspicion and cerebrospinal fluid (CSF) serology. Forty-eight year old Caucasian female presented with a sudden onset of altered mental status after being found unresponsive. She was confused with intermittent bouts of alertness/lethargy and unintelligible responses to questioning. Her medical problems included endometrial cancer that was in remission after undergoing a total abdominal hysterectomy with bilateral salpingectomy and postoperative chemotherapy with paclitaxel and carboplatin. Pertinent physical examination revealed muscle strength that was significantly decreased, nuchal rigidity and +2 pitting edema of both lower extremities. Computed tomography and magnetic resonance imaging of the brain were negative for any intracranial pathology. CSF analysis was consistent with aseptic meningitis with all CSF serology being negative except for positive WNV antibody. A few days after being admitted she developed involuntary random movements of her eyes and generalized jerking movements (myoclonus). This was determined to be opsoclonus myoclonus syndrome (OMS) induced by the WNV meningoencephalitis. She then received five consecutive days of plasmapheresis with a significant improvement in her neurological status. Opsoclonus-myoclonus syndrome (OMS) is a rare neurological disorder associated with chaotic multidirectional eye movements, myoclonus and less frequently cerebellar ataxia. OMS affects as few as 1 in 10,000,000 people per year. The pathogenesis is not fully understood with the majority of cases of opsoclonus-myoclonus syndrome being idiopathic. According to current medical literature there have only been two previous case reports of opsoclonus myoclonus syndrome associated with WNV encephalitis.
Highlights
West Nile virus (WNV) is an arthropod borne neurotropic single stranded RNA flavivirus.[1]
Definitive ly diagnosis of WNV meningoencephalitis is a combination of clinical suspicion and ceren brospinal fluid (CSF) serology
The definitive diagnosis of WNV meningoencephalitis is a combination of clinical suspicion and CSF serology
Summary
Definitive ly diagnosis of WNV meningoencephalitis is a combination of clinical suspicion and ceren brospinal fluid (CSF) serology. Forty-eight year o old Caucasian female presented with a sudden onset of altered mental status after being e found unresponsive. She was confused with s intermittent bouts of alertness/lethargy and u unintelligible responses to questioning. -c consistent with aseptic meningitis with all CSF n serology being negative except for positive. Neurological deficits associated with WNV infection can be encephalitis, meningitis or flaccid paralysis. The definitive diagnosis of WNV meningoencephalitis is a combination of clinical suspicion and CSF serology. We are presenting a very rare case of a immunocompromised patient that developed opsoclonus myoclonus syndrome following WNV encephalitis
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