John Goodsir (1814-1867) and his neurological illness.

John Goodsir, conservator and professor of anatomy at the University of Edinburgh, suffered an unidentified illness described by experts after his death as tabes. The features that led to this diagnosis, the understanding of tabes at that time and its relationship in some cases to syphilis, are discussed. It is concluded that the most likely diagnoses are subacute combined degeneration of the cord as a result of malnutrition or tabes dorsalis resulting from earlier syphilis. The presence of 'lightning pains' leans towards the latter diagnosis but evidence for a means of acquisition of syphilis is lacking. The disadvantages of retrospective diagnosis are discussed.