Neurological red flag: the numb chin

A 51-year-old man presented to the neurology clinic with numbness affecting the left side of his chin, which had developed over a few days. Three weeks later, he reported pain affecting the left side of his face, locking of the jaw on chewing and numbness of the left side of the tongue. He worked as a maintenance fitter in a sewage works and had suffered exposure to raw sewage 2 months before his clinic visit, followed by diarrhoea and...