Subacute herpes simplex virus type 1 encephalitis as an initial presentation of chronic lymphocytic leukemia and multiple sclerosis: a case report
© Singhal and Corman; licensee BioMed Central Ltd. 2011
Received: 24 October 2009
Accepted: 11 February 2011
Published: 11 February 2011
Herpes simplex virus type 1 encephalitis presents acutely in patients who are immunocompetent. We report what we believe to be the first published case of a subacute course of herpes simplex virus type 1 encephalitis in a patient with asymptomatic chronic lymphocytic leukemia who subsequently developed multiple sclerosis.
A 49-year-old Caucasian woman with a history of fever blisters presented to the emergency department with a history of left temporal headache for four weeks, and numbness of the left face and leg for two weeks. A complete blood count revealed white blood cell count of 11,820 cells/mL, with an absolute lymphocyte count of 7304 cells/mL. The cerebrospinal fluid contained 6 white blood cells/μL, 63 red blood cells/μL, 54 mg glucose/dL, and 49 mg total protein/dL. Magnetic resonance imaging of the brain revealed meningoencephalitis and bilateral ventriculitis. Cerebrospinal fluid polymerase chain reaction for herpes simplex virus type 1 was positive, and the patient's symptoms resolved after ten days of treatment with parenteral aciclovir. Incidental findings on peripheral blood smear and flow cytometry testing confirmed chronic lymphocytic leukemia. One month later, she developed bilateral numbness of the hands and feet; a repeat cerebrospinal fluid polymerase chain reaction for herpes simplex virus type 1 at this time was negative. A repeat magnetic resonance imaging scan showed an expansion of the peri-ventricular lesions, and the cerebrospinal fluid contained elevated oligoclonal bands and myelin basic protein. A brain biopsy revealed gliosis consistent with multiple sclerosis, and the patient responded to treatment with high-dose parenteral steroids.
Herpes simplex virus type 1 encephalitis is a rare presentation of chronic lymphocytic leukemia. Our patient had an atypical, subacute course, presumably due to immunosuppression from chronic lymphocytic leukemia. This unusual case of herpes simplex virus type 1 encephalitis emphasizes the importance of T cell function in diseases of immune dysregulation and autoimmunity such as chronic lymphocytic leukemia and multiple sclerosis. It raises the question of whether atypical presentations of herpes simplex virus encephalitis warrant deliberations on immunocompetence. The development of multiple sclerosis in our patient so soon after she received treatment for herpes simplex virus type 1 encephalitis raises the possibility that herpes simplex virus type 1 encephalitis in an immunosuppressed patient may trigger multiple sclerosis.
Herpes simplex virus type 1 (HSV-1) encephalitis is the most common cause of adult encephalitis worldwide. It classically occurs in patients under the age of 20 years due to primary infection, or in patients over the age of 50 years due to reactivation of latent infection. It is thought to occur sporadically in patients who are immunocompetent at the same rate as it does in patients who are immunocompromised .
HSV-1 encephalitis usually presents acutely, with general and focal signs of cerebral dysfunction such as fever, headache, altered mental status, behavioral changes, confusion, seizures, focal neurological findings, and abnormal cerebrospinal fluid (CSF) findings. The CSF of patients with HSV-1 encephalitis typically demonstrates a lymphocytic pleocytosis (white blood cells (WBC): 10 to 500 cells/μL), and erythrocytosis (red blood cells (RBC): 10 to 500 cells/μL). Levels of protein may be elevated to 60 to 700 mg/dL, and levels of glucose may be normal or slightly decreased (30 to 40 mg/dL).
Imaging of the brain with magnetic resonance imaging (MRI) classically demonstrates high signal intensity of the temporal lobe. Electroencephalography (EEG) results may show focal temporal abnormalities, such as spikes and slow waves or periodic sharp wave patterns. A diagnosis of HSV encephalitis is confirmed with identification of HSV in the CSF via polymerase chain reaction (PCR) testing or, less commonly, with identification of HSV in brain tissue via biopsy.
It is well established that patients with defects in cell-mediated immunity are at increased risk of severe oral or genital HSV infection; however, an increased frequency of HSV meningoencephalitis has not been reported. We report a subacute course of HSV-1 meningoencephalitis in a patient with undiagnosed chronic lymphocytic leukemia (CLL), who presented with biopsy-proven multiple sclerosis (MS) shortly after receiving treatment for HSV-1 encephalitis.
A 49-year-old Caucasian woman with a history of migraines and herpes labialis presented to the emergency department (ED) with headache, and numbness and tingling in the left side of her face and her left leg. She related a history of recurrent sinusitis related to seasonal allergies, but with no recent nasal or pulmonary symptoms. She had developed peri-oral fever blisters, a low-grade fever, and a disabling left temporal headache four weeks earlier. Her headache was unlike the typical migraines that she periodically experienced, which usually responded to a combination of acetaminophen, aspirin, and caffeine. In addition, she experienced nausea, vomiting, and decreased appetite in association with her headaches that were accompanied by a 7.7 kg weight loss. She also exhibited personality changes and short-term memory loss. Her blisters healed in two weeks, but her headache and fatigue persisted. She subsequently developed numbness and subjective weakness in the left side of her face and her left leg one week prior to presentation. She sought care from her primary care provider, who diagnosed her with Bell's palsy and prescribed metoclopramide for her nausea. She was also referred to a neurologist who began treatment with aspirin for suspected transient ischemic attack. An MRI of the brain was pending at the time of her presentation to the ED.
Results of infectious and vasculitic and neoplastic studies performed on patient's first admission
Result (normal range or value)
Result (normal range)
Ehrlichia Ab titers
Anaplasma phagocytophilum IgG
Aerobic/anaerobic culture with Gram stain
No organisms seen, no growth at 3 days
Ehrlichia chaffeensis IgG
Bartonella Ab titers
Bartonella henselae IgG and IgM
<1:128 and <1:20 (<1:128 and <1:20)
Fungal preparation and culture
No fungal elements seen, no fungus recovered at 4 weeks
Bartonella quintana IgG and IgM
<1:128 and <1:20 (<1:128 and <1:20)
Lyme disease antigen PCR
AFB culture with smear
No AFB seen, no AFB recovered at 8 weeks.
Viral hepatitis panel
HA Ab (IgM)
HBcAb (IgM) and HBsAg
LCMV IgG and IgM Ab titer
<1:16 and <1:20 (<1:16 and <1:20)
LCMV IgG and IgM Ab titer
<1:1 and <1:1 (<1:1 and <1:1)
WNV IgG and IgM Ab
WNV IgG and IgM Ab
Toxoplasma IgG and IgM Ab titer
36 IU/mL and <0.55 (<4 and <0.55)
9 (0 to 20)
ACE (ACE units)
Expanded ANA screen: Abs to dsDNA, chromatin, Sm, RNP, Sm-RNP, Ribosomal protein, SS-A, SS-B, Jo-1, Scl-70, and Centromere B
Serum protein electrophoresis
No monoclonal bands identified
A diagnosis of CLL was confirmed by the expression of CD5, CD19, and CD20 antigens on monoclonal B cells with κ light chain restriction on blood flow cytometry. Fluorescent in situ hybridization later revealed a 13 q deletion, the most common cytogenetic abnormality seen among patients with CLL. The patient's γ-globulin level was 839 mg/dL (normal range 700 to 1600). After eight days on intravenous aciclovir, her symptoms had completely resolved and she was discharged on oral valaciclovir. She remained well for the next few weeks.
Comparison of laboratory studies performed during patient's first and second admissions
First admission (2 to 9 February)
Second admission (11 to 21 March)
Normal range or value
Complete blood count
WBC (× 109/L)
4.8 to 10.8
Absolute lymphocytes (× 103/μL)
1.20 to 3.40
CSF lumbar puncture
0 to 5
Number of cells counted
Total protein (mg/dL)
15 to 45
CSF rapid PCR for HSV-1
CSF flow cytometry
CSF IgG index
CSF IgG index
CSF IgG (mg/dL)
CSF albumin (mg/dL)
CSF synthesis rate (mg/24 hours)
Serum IgG (mg/dL)
600 to 1500
Serum albumin (mg/dL)
3200 to 4800
CSF myelin basic protein (ng/mL)
HSV-1 encephalitis usually presents fulminantly in immunocompetent individuals with fever, altered mental status, seizures, CSF and EEG findings, and temporal lobe lesions on MRI. Our patient's illness began with recurrent herpes simplex labialis, which spread to the left trigeminal nerve and left L5 nerve root over the course of four weeks. Besides her dysesthesias, her symptoms included headache, low-grade fever, weight loss, mild personality change and short-term memory loss, which were no longer exhibited on presentation. Her CSF contained mildly elevated levels of lymphocytes (WBC: 6 cells/μL), erythrocytes (RBC: 63 cells/μL), and protein (49 mg/dL); owing to the fact that cell counts were taken from the fourth tube collected, the probability of a traumatic lumbar puncture is low. Beyond her MRI findings of peri-ventriculitis and basal meningitis particularly over the brainstem, our patient had no temporal lobe abnormalities, although approximately 10% of patients with PCR-proven HSV encephalitis do not demonstrate temporal lobe involvement. In addition, other cases of brainstem encephalitis due to HSV have been reported with viral reactivation possibly occurring in the trigeminal nerve (relevant references are available upon request from the corresponding author). Regarding involvement of white matter, other cases of extratemporal HSV encephalitis have also shown this pattern on neuroimaging, particularly during chronic or subacute phases of illness; often being associated with clinical relapse and viral persistence; and sometimes showing demyelination in addition to edema, inflammatory change, and viral inclusions on a microscopic level (relevant references are available upon request from the corresponding author). Overall, our patient's clinical presentation, borderline pleocytosis in the CSF, and extratemporal findings on MRI were consistent with a more subacute course of HSV-1 encephalitis proven by PCR, presumably due to immunosuppression from CLL.
Patients with CLL often manifest hypogammaglobulinemia and neutropenia early in the course of the disease, with eventual T cell deficiency leading to recurrent sinopulmonary infections with Gram-negative bacteria, fungi, and herpes zoster and simplex viruses. However, HSV-1 encephalitis is a rare presentation of CLL. Other central nervous system (CNS) infections have been reported in patients with CLL, namely progressive multifocal leukoencephalopathy, West Nile virus encephalitis, and Listeria monocytogenes encephalitis. The occurrence of HSV-1 encephalitis in immunocompromised patients has rarely been reported. Classic clinical presentations with atypical laboratory studies have been described in a patient with metastatic colon cancer four weeks after receiving chemotherapy , three patients who were immunosuppressed with either Hodgkin's or non-Hodgkin's lymphoma [3–5], and another patient with glioblastoma multiforme on dexamethasone . Atypical clinical presentations of HSV encephalitis have been described in patients receiving steroids, and also occur in 2% of patients infected with human immunodeficiency virus (HIV) with neurological symptoms, usually in association with CD4 T cell counts <200 cells/μL .
The literature exploring the association of MS with CLL is very limited. Neither the development of CLL prior to the development of MS, nor the reverse, have been shown to have an association in retrospective studies (; additional references are available upon request from the corresponding author). Only one study has shown an increased risk of Hodgkin's and non-Hodgkin's lymphoma in first-degree relatives of patients with MS, and this is thought to be related to shared environmental and constitutional factors such as infection with Epstein-Barr virus or expression of the HLA-DR2 allele.
A recent study of patients with MS has demonstrated alterations in dendritic cell antigens and interferon expression in response to HSV-1 challenge to mononuclear cells . Whether such an impaired immune response to viral infection is present before the development of MS is unknown. Additionally, patients with MS are known to have elevated antibody titers to HSV-1 in the CSF, but this is purported to be non-specific and studies of CSF PCR for HSV-1 in patients with MS have failed to find a statistically significant association . There is evidence of association between infection with Epstein-Barr virus (EBV) and subsequent diagnosis of MS, as well as between CNS infection with human herpesvirus 6 variant A (HHV6A) and concurrent MS ; however causal relationships are yet unproven. Our patient did not undergo serological EBV testing or CSF studies for HHV6 during her admissions.
No definitive association can be inferred regarding the development of MS in our patient so soon after her diagnoses of CLL and HSV-1 encephalitis, but this occurrence warrants reporting. This atypical presentation of HSV-1 infection in a patient with undiagnosed CLL emphasizes the importance of T cell function in diseases of immune dysregulation and autoimmunity such as CLL and MS. It raises the issue of whether patients with atypical presentations of HSV encephalitis deserve a deliberation on their state of immunocompetence.
Written informed consent was obtained from the patient for publication of this case report and any accompanying images. A copy of the written consent is available for review by the Editor-in-Chief of this journal.
We would like to acknowledge pathologist Frank Honkanen, MD, for discussing the pathological findings of the brain biopsy with the authors and procuring the images in Figure 2, trainee physician Pavan Panchavati, MD, for reviewing the initial abstract of this case and who admitted the patient to the emergency department, and hematologist/oncologist Ali Hachem, MD, and neurologist Theodros Mengesha, MD, for reviewing the abstract and discussing the case with the authors.
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