[Pulmonary mycobacteriosis due to a non-chromogenic, slow-growing, unclassified mycobacterium]

A case is reported of a bilateral atypical mycobacterial infection, occurring in a 44 year old male with antecedent silicosis. Successful surgical resection was performed after 17 months of failed chemotherapy. The atypical mycobacterium which is unclassified is intermediate between Mycobacterium avium-intracellulare. Mycobacterium terrae complex and Mycobacterium gastri. It has some similarities with the newly described species, Mycobacterium malmöense.