Primary skeletal muscle tuberculosis at an unusual site

Tuberculosis can involve virtually any organ and it manifests itself in various forms. the selective involvement of muscles by a tuberculous process without coexisting active skeletal or extraskeletal tuberculosis is very rarely seen. a case of isolated tuberculosis of the biceps brachii muscle without any evident primary focus revealed as an intramuscular mass in a 37 years old immunocompetent female is presented. diagnosis was established by histology and acid fast stain culture. the patient showed marked improvement with a standard four drug regimen with no evidence of disease activity at the four year follow up. this rare case is presented with review of literature.