A reminder of the anatomy of the pons; although included to clarify the anatomical terms, a small lesion is in fact present, illustrating how easily such lesions may be missed on cursory pathological examination. A reminder of the anatomy of the pons; although included to clarify the anatomical terms, a small lesion is in fact present, illustrating how easily such lesions may be missed on cursory pathological examination. R J Martin J Neurol Neurosurg Psychiatry 2004;75:iii22-iii28 ©2004 by BMJ Publishing Group Ltd