An unusual cause of an ankle mass.

We report the case of a patient who presented with a 7-year history of a mass over the medial aspect of his right ankle, which had been gradually increasing in size. He had given up his occupation as a bus driver due to decreased movement of his ankle. An initial diagnosis of endemic syphilis was made after treponemal antibody and treponema pallidum particle agglutination tests were positive. However, following surgical debulking, cultures grew Fusarium solani and the diagnosis was changed to eumycetoma. He received prolonged treatment with antifungal agents and at 18 months follow-up remains well.