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Tacrolimus-associated neurotoxicity isolated to the brainstem: two illustrative cases and a systematic review of the literature

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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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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

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Authors and Affiliations

Authors

Contributions

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.

Corresponding author

Correspondence to Simone Rossi.

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This is a case series including two patients and a literature review. No ethical approval is required.

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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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