Chronic Hip Arthritis Secondary to <i>Mycobacterium brisbanense</i> in an Immunocompetent Pediatric Patient: A Case Report

A 12 year old boy presented with chronic left hip pain unresponsive to antibiotics. Laboratory tests showed raised white blood cells and C-reactive protein. MRI hips showed left hip synovitis. Synovial biopsy showed infection with Mycobacterium brisbanense. One month after treatment with oral Moxifloxacin, Linezolid and Clarithromycin, his symptoms improved. This case highlights the need to rule out infection especially in monoarticular and atypical presentations before the diagnosis of Juvenile Idiopathic Arthritis should be made.