Introduction: Septic arthritis of the facet joint is a severe infection. The lumbar spine is frequently involved; the dorsal one is rarely affected.Case report: We present a case of a patient with a history of right cervicobrachial neuralgia with anorexia and asthenia without fever. Performed investigations had concluded to tuberculous arthritis of the dorsal facet joint. The tuberculous etiology is an originality of our observation since it has been reported in only one case. In the absence of histological and bacteriological proof, the diagnosis was established according to clinical, epidemiological and biological data. Treatment was based on antitubercular antibiotics.Conclusion: The tuberculous origin of septic facet joint should be considered in front of trolling and unexplained back pain, especially in endemic countries.