Abstract
Introduction
Tacrolimus-associated neurotoxicity (TAN) manifests with wide clinical spectrum, ranging from mild tremors to severe encephalopathy. The isolated involvement of the brainstem is a rarely documented presentation of TAN, and its clinical and diagnostic characteristics are unclear.
Methods
We report two cases of brainstem-isolated TAN (bi-TAN). Moreover, we performed a systematic review of the literature on bi-TAN and extracted data concerning demographics, clinical characteristics, radiological features, and management. The systematic literature search followed PRISMA guidelines and a pre-defined protocol.
Results
Eleven patients, including our two, were identified (mean age: 41.3 years, ± 18.8; five males, 45%). Speech disturbance was the most common clinical presentation (45%). The mean latency from Tacrolimus initiation to bi-TAN onset was 26 days (± 30.8). Tacrolimus serum level tested above the reference range in three patients (mean: 26.83 ± 5.48). Brain MRI showed T2-FLAIR hyperintensities; three showed restricted diffusion on ADC maps. Neurological symptoms resolved completely in seven patients (63%) after Tacrolimus withdrawal or dose reduction.
Conclusions
Our findings suggest that bi-TAN could represent a brainstem variant of posterior reversible encephalopathy syndrome. Recognition of bi-TAN as a potential cause of isolated brainstem lesions is crucial to disentangle the diagnostic work-up and ensure prompt withdrawal or reduction of the offending agent.
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Data availability
The corresponding author has full access to all of the data and has the right to publish any and all data separate and apart from any sponsor.
Code availability
Not applicable.
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Design and conceptualization of the study: S. R., R. R., M. G.
Drafting of the manuscript: S. R., G. M. A., V. B.
Major role in acquisition and interpretation of data: S. R., G. M. A., V. B., L. F., L. S.
Analysis of neuroradiological images: L. F., L. S.
Revision of the manuscript for intellectual content: P. P., M. C. M., M. C., P. C., M. G.
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Rossi, S., Rinaldi, R., Asioli, G.M. et al. Tacrolimus-associated neurotoxicity isolated to the brainstem: two illustrative cases and a systematic review of the literature. Neurol Sci (2024). https://doi.org/10.1007/s10072-024-07433-8
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DOI: https://doi.org/10.1007/s10072-024-07433-8