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A 66-year-old man with maturity onset diabetes mellitus presented with a 2-month history of painless right facial ulceration (figure 1). Four months ago, he had been admitted with an abrupt-onset imbalance with vomiting and right facial numbness. Eight weeks later, a right-sided nasal ulcer …
Competing interests Geraint Fuller is co-editor of Practical Neurology.
Patient consent Obtained.
Provenance and peer review Not commissioned; externally peer reviewed.