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[Cutaneous tuberculosis affecting the buttock in an immunocompetent adult patient].

Tuberculosis is an endemic disease in Senegal. It rarely affects the skin. In these patients it is characterized by clinical polymorphism. It accounts for 2% of extra-pulmonary tuberculosis. We here report the case of an immunocompetent patient with tuberculosis affecting the buttock characterized by lesions gummy in consistency revealing active pulmonary involvement. This study involved a 47-year-old man admitted for a painful swelling in the right gluteal region that had evolved for four years. Physical examination objectified a polyfistulized hardened plaque characterized by confluent nodules and discharge of yellowish pus in the lower and inner face of the right buttock associated with bilateral inguinal inflammatory adenopathies. The diagnosis of skin tuberculosis was retained based on histological examination which showed tuberculoid granuloma and the detection of Alcohol-Acid Resistant Bacilli (BAAR) in the gastric fluid. Thoracoabdominopelvic CT scan showed multiple bilateral basal lung micronodules with a "bud tree" appearance. Serologic testing for HIV and HBV were negative. The patient achieved recovery after six months of tuberculosis treatment. In endemic areas, skin tuberculosis is characterized by clinical polymorphism. It should be suspected in patients with perineal abscess lesion.