Introduction
Brucellosis is originally an infectious disease of domestic and wild animals, caused by Brucellae , a small, nonmotile, and facultative intracellular aerobic rod. This infection is transmitted to humans via the consumption of infected unpasteurized animal products. Brucellosis is also considered an occupational infection among shepherds, dairy industry workers, and laboratory personnel. Endemic areas of Brucellosis include countries of the Mediterranean Basin, and the Middle East such as Iran, central Asia, and China (1). Therefore, those living in rural areas of endemic countries are at high risk of being infected. Development of symptoms and signs may be abrupt or insidious over several days to weeks. The symptoms are variable and nonspecific, including fever with variable patterns, night sweats, low back pain, malaise, and weight loss (1).
definitive laboratory criteria ( not the case) for diagnosis are defined as either the positive culture of blood, body fluid, or tissue or a fourfold or greater rise in Brucella antibody titer ≥ 2 weeks apart (1).
A case is confirmed as Brucellosis when a clinically compatible illness with definitive laboratory evidence of Brucella  infection is found.
A presumptive diagnosis of Brucellosis is made by Brucella total antibody titer ≥ 1:160 by Standard Tube Agglutination (SAT) or detection of Brucella DNA in a clinical specimen (1).
Complications of Brucellosis occur more frequently in adults than in children. These complications can affect any organ system including osteoarticular, genitourinary, neurologic, and cardiovascular systems. One of the rare complications of Brucellae spondylodiscitis is Psoas abscess (1).
Psoas abscess management consists of percutaneous or surgical drainage and antibiotic therapy. Antibiotics alone are considered unlikely to be curative unless the abscess is less than 3 cm in size (2).
We report a 14-year-old male patient with Psoas abscess due to Brucellosis which was treated successfully with oral antibiotics alone.