A case of pyogenic lumber facet infection is reported. A 15-years-old man had lumbago and a fever of 38 degress. Lumber X-ray indicated scoliosis and blood tests showed increased leukocyte count and C-reactive protein (CRP). He had tenderness and local heat of the right para vertebral muscle (PVM). The soft tissue surrounding the right L2/3 facet joint and PVM showed abnormal intensity on Magnetic resonance imaging (MRI). For the reasons mentioned above, we diagnosed the illness as pyogenic lumber facet joint infection. Centesis was performed using computed tomography (CT), and as a result, a little yellow pus was extracted from the facet joint. Staphyrococcus aureus was detected by the cultivation of bacteria. He was given an intravenous drip infusion of the suitable antibiotic. Six days later, clinical symptoms inproved and 25 days later, infection signs normalized. MRI was proved useful in the diagnosis of this disease.
