The presentation of the 41-year-old female patient was due to headaches with nausea and vomiting, which have been present for about 2 weeks. The headaches began from the cervical spine area and radiated to both temples, with initial pain intensity of 4–5/10 on the Numeric Rating Scale (NRS). In addition to their other complaints, the patient reported experiencing pressure behind both eyes. She sought medical attention from her family doctor and was prescribed ibuprofen 600 mg up to 3 times a day and metamizole 500mg up to 3 times a day. Due to known problems with her cervical spine, the patient also consulted an outpatient orthopedist, who recommended adapted analgesics as needed. Despite a daily intake of ibuprofen 600mg 3 times a day and metamizole 500mg 3 times, the headaches did not improve. Multiple sclerosis had been known since 2006 and is currently being treated with ocrelizumab. Her previous DMT was Interferon but she switched to Ocrelizumab 2 years ago. A couple of years ago, a tick bit her, and weeks after that, she developed a rash.
On magnetic resonance imaging (MRI) of the head, several older MS-typical lesions were found supratentorially, periventricularly, and juxta-cortically. A lesion measuring up to approximately 1.5 cm was found right periventricularly. After contrast agent administration, we were unable to objectively demonstrate any active lesions.
In the cerebrospinal fluid, we saw a significant increase in cell count (573 cells) accompanied by lactate and protein increases, so we treated the patient with aciclovir and ceftriaxone intravenously as an urgent suspicion of meningoencephalitis with a subacute course. The Reiber diagram showed a barrier disturbance with intrathecal IgM synthesis; the IgG and IgM antibodies for Borrelia were positive in both the serum and the cerebrospinal fluid. The PCR panel in the cerebrospinal fluid showed no evidence of viral infection. JC virus DNA was not detected in the cerebrospinal fluid.
After ruling out herpes infection, intravenous aciclovir therapy was discontinued. Ceftriaxone was given for a total of 7 days. During the course of treatment, the patient's symptoms improved significantly. By the second day of hospitalization, the patient no longer experienced headaches or dizziness. After 7 days (with clinical improvement, no symptoms, and confirmed Borrelia infection in the serum and cerebrospinal fluid) we decided to switch from ceftriaxone to doxycycline (which can be taken orally) and discharge the patient to home care.