Sternal tuberculosis is a form of osteoarticular tuberculosis. It remains a rare localization, whose diagnosis is based on bacteriological and anatomopathological samples. The treatment is medical and surgical, and the prognosis is better with the antibacillary treatment. We report a case of sternal tuberculosis in an 18-year-old girl with no pathological history who presented with a parasternal right swelling and whose Bacteriological samples was favorable for tuberculosis according to GeneXpert test and the histological analysis revealed a granulomatous lesion without caseous necrosis.