Abstract
We report a case of a patient with a rapidly progressive dementing illness and gait disturbance, in whom initial screening demonstrated a high methylmalonic acid level only, suggestive of a functional vitamin B12 deficiency. Despite B12 replacement therapy, he continued to decline. Further investigations demonstrated extensive signal change on magnetic resonance imaging involving grey and white matter within the corpus callosum, deep grey matter, brainstem and cerebellar peduncles, and patchy post-contrast enhancement. Laboratory testing revealed a raised erythrocyte sedimentation rate, raised anti-nuclear, intrinsic factor and lupus anticoagulant antibody titres, and a IgG kappa paraprotein. Cerebrospinal fluid was unremarkable. Bone marrow trephine biopsy showed monoclonal gammopathy of unknown significance. The patient initially responded to steroids, and underwent a brain biopsy, which was uninformative. However, 3 weeks following admission, he died due to an aspiration pneumonia. Autopsy findings were consistent with a diffuse primary central nervous system small cell B-cell lymphoma. This has been rarely reported in the medical literature, but our case exhibits typical clinical features, although patchy enhancement on imaging and the high methylmalonic acid have not been previously described. We hypothesise that his functional B12 deficiency may have resulted from rapid cell turnover, perhaps in conjunction with the presence of intrinsic factor antibodies.
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Acknowledgments
The authors wish to thank Dr Atta Siddiqui, Dept of Radiology, St Thomas’ Hospital, for his assistance with interpretation and provision of imaging, and Dr Bridget Wilkins, Dept of Histopathology, St Thomas’ Hospital, for assistance in interpreting brain and bone marrow histopathology.
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Leschziner, G., Rudge, P., Lucas, S. et al. Lymphomatosis cerebri presenting as a rapidly progressive dementia with a high methylmalonic acid. J Neurol 258, 1489–1493 (2011). https://doi.org/10.1007/s00415-011-5965-5
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DOI: https://doi.org/10.1007/s00415-011-5965-5