From:
https://ugeskriftet.dk/videnskab/neuroborreliose-tolket-som-multipel-sklerose-ved-mr-skanningMachine translated from Danish (might contain errors):
A Danish review of 431 patients with neuroborreliosis from 2017 showed that the mean incidence of Lyme neuroborreliosis (LNB) was 4.7 per 100,000 inhabitants per year on Funen. The most common clinical symptoms were painful radiculitis (66%), cranial nerve palsy (43%) and headache (28%). The study showed an unchanged delay from symptom onset to diagnosis over 20 years. Confirmatory diagnosis of LNB requires neurologic symptoms consistent with LNB, lymphocytic pleocytosis in the cerebrospinal fluid, and intrathecal Borrelia burgdorferi-specific immunoglobulin (Ig) G and/or IgM antibody synthesis.
Multiple sclerosis (MS) is diagnosed after a symptom that increases over hours to days and lasts for several weeks, after which it usually slowly disappears. These symptoms usually occur in younger adults and are typically related to optic neuritis, cerebellar syndrome, spinal cord syndrome or brainstem syndrome. Thus, the symptom must be localized in the central nervous system (CNS) and last for at least 24 hours, and the patient must not be febrile. Such a symptom allows the diagnosis of MS to be made if MRI of the CNS shows dissemination in space and there are oligoclonal bands in the cerebrospinal fluid (CSF).
In this article, we describe a patient who met the criteria for both diagnoses and review MRI scan changes in LNB.
CASE HISTORY
A 27-year-old man, previously healthy, was referred in November 2021 due to increasing headaches. He related the headache to a minor head trauma during a ball game in July 2021. However, the medical history revealed that the headache occurred a week after the head trauma, which was not associated with impaired consciousness. It was also revealed that the patient had attended a survival course a month before, but he did not remember observing any skin changes. He experienced double vision when looking straight ahead, intermittent dizziness, persistent light sensitivity and paresthesias in his fingers, and generally reduced energy levels. Examinations showed latent outward strabismus and restricted inward rotation of the eyes. MRI scan of the cerebrum in April 2022 showed juxtacortical and periventricular lesions (Figure 1).
On suspicion of MS, a spinal fluid examination was performed in May 2022, which showed eight mononuclear cells, elevated IgG index and oligoclonal bands. Finally, a positive intrathecal Borrelia antibody index was found. The patient started treatment with doxycycline 200mg daily for three weeks.At 12-month follow-up, he reported significant improvement in headache and a marked reduction in photosensitivity, but continued impact on quality of life as he often had to be selective in what he could manage.Memory was good, but there was continued difficulty concentrating. Ophthalmologic examination in June 2023 showed completely normal conditions.Control MRI scans showed unchanged conditions in September 2022 and in September 2023.
DISCUSSION
This case history shows that even a very small increase in CSF mononuclear cell count can be seen in LNB. In the above-mentioned Danish study, normal CSF cell counts were found in about
11% of patients with LNB. This delayed treatment time and increased the risk of persistent symptoms. Contributing to the delay in the current patient was the fact that he was part of both the approximately 80% who do not remember a rash and the more than 60% who do not remember ever being bitten by a tick.
A PubMed search found seven case reports describing juxtacortical lesions, periventricular lesions, brainstem lesions and spinal cord lesions in relation to LNB. These changes were associated with the symptoms described above, but also with symptoms of optic neuritis. In one of the articles, the LNB changes were distinguished from MS changes by a special MRI scanning technique.
Demyelinating changes periventricular to the LNB were also found histologically.This supports a secondary autoimmune reaction, which is one of the pathogenetic hypotheses in MS.
Another 15 case reports described MRI scan changes in LNB in the form of cranial nerve involvement, meningoencephalitis, meningoradiculitis, encephalitis, vasculitis and tumor-like changes.
Thus, we conclude that there may be overlap between LNB and MS on MRI, but larger, prospective case-control studies are needed to better elucidate changes in LNB. At the slightest suspicion of LNB, lumbar puncture should be performed, and a normal cell count in the spinal fluid does not rule out LNB.