Mycobacterium fortuitum infection masquerading as an orbital mass.

Orbital infection with nontuberculous mycobacteria is rare and usually presents as an inflammatory process. We report a case of a 34-year-old male hospital worker with a positive purified protein derivative skin test who had Mycobacterium fortuitum infection that presented as an orbital mass causing diplopia. This presentation is unlike previously published reports and demonstrates the importance of orbital biopsy and tissue culture.