CASE REPORT article
Front. Oncol.
Sec. Neuro-Oncology and Neurosurgical Oncology
Progressive Multifocal Leukoencephalopathy as the Initial Manifestation of Relapsed Lymphoma: A Case Report
Provisionally accepted
- 1Chifeng Municipal Hospital, Chifeng, China
- 2Xuanwu Hospital Capital Medical University Department of Neurology, Beijing, China
Select one of your emails
You have multiple emails registered with Frontiers:
Notify me on publication
Please enter your email address:
If you already have an account, please login
You don't have a Frontiers account ? You can register here
Progressive multifocal leukoencephalopathy (PML) is a rare and often fatal demyelinating disease of the central nervous system (CNS) caused by the reactivation of the JC polyomavirus (JCPyV). While PML is a known complication of hematological malignancies, it is exceedingly rare for it to manifest as the initial neurological symptom of a relapsed lymphoma, occurring even before the start of new systemic chemotherapy. We present a case of a 22-year-old male with a history of lymphoma who presented with progressive neurological deficits. The patient's symptoms, including right-sided hemiparesis and aphasia, were initially mistaken for a CNS lymphoma relapse. Subsequent chemotherapy led to a rapid and severe clinical deterioration. Cerebrospinal fluid testing detected a high viral load of JCPyV. The patient underwent a brain biopsy, which revealed inflammatory changes consistent with the pathological changes of PML. This case highlights a critical diagnostic challenge and underscores the need for a high index of suspicion for PML in any immunocompromised patient with new-onset neurological symptoms, regardless of whether they have commenced new immunosuppressive therapy. It also serves as a poignant reminder of the potential for chemotherapy to exacerbate an underlying viral pathology.
Keywords: case report, JC polyomavirus, Lymphoma, PML, progressive multifocal leukoencephalopathy, relapse
Received: 21 Sep 2025; Accepted: 02 Feb 2026.
Copyright: © 2026 Chen, Nan and Li. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence: Haitian Nan
Disclaimer: All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.