Neurolymphomatosis or paraneoplastic syndrome? - #15982

Good morning, I will try to summarize my history for an opinion, even though I am aware of the limitations of distance. ​In the first week of August, I noticed a swollen, non-tender retroauricular lymph node (right ear). In September, I had an ultrasound which showed no suspicious features, and I was only told to repeat it if I noticed an increase in size. ​One night in mid-October, I woke up completely sweaty and shivering, and I realized I had a low-grade fever. ​This low-grade fever (max 37.7°C) lasted 2 days, but at night I started having strange tingling sensations in my legs that kept me from sleeping, and on the fourth day from the onset of the fever, I felt a searing burn in my right leg for several hours. From that moment until now, over a month later, my right leg is constantly weak, numb, sometimes with burning/pain extending to the sole of the foot, and my left arm is also weak and lacks strength (to a lesser extent than the leg). The night sweats continued intermittently for 2 weeks and have now disappeared. ​Over the course of this month, I underwent: ​2 further ultrasounds of the lymph node stations which showed reactive lymph nodes with no suspicious characteristics. ​CT scan of the neck, chest, and abdomen without contrast: Reported small reactive lymph node nodules. The mediastinum showed some subcentimetric, reactive-looking lymph node nodules. Some reactive lymph node nodules in the lomboaortic area and a greater number in the inguinal area, non-liquefied and non-confluent. ​Blood tests (all normal): Complete blood count with smear, LDH, Beta-2 microglobulin, iron and ferritin levels, ESR, CRP, protein electrophoresis, Bence Jones protein in the serum, complete urine test, ANA, and rheumatoid factor. ​Serology: Positive EBV IgG, negative EBV IgM; Anti-Herpes positive IgG only; Cytomegalovirus and Toxoplasmosis all negative. ​Electromyography (EMG): Performed 2 weeks after the onset of symptoms, negative. ​MRI without contrast of the brainstem and spinal cord: All normal except for "Verticalization of the physiological cervical lordosis," "Diffuse protrusion of the posterior disc margin of L4/L5 with impression on the dural sac," and "Slight posterior median and bilateral paramedian protrusion at L5/S1 impressing the dural cul-de-sac." ​I had two hematological consultations where, in light of the performed tests, I was told there is no trace of lymphoproliferative disease. ​The neurologist, after prescribing the EMG and MRI without contrast, advised me to see an orthopedist. ​Unfortunately, however, my arm and leg symptoms have been constant for over a month now. ​I have read in scientific articles that lymphoma can, in rare cases, present with symptoms very compatible with mine, by infiltrating the nerves or due to a paraneoplastic syndrome. ​I am very worried and hope for your kind feedback. ​Thank you in advance.