Abstract
Obturator externus muscle pyomyositis in adults is rare. We report the successful treatment of a case of obturator externus muscle pyomyositis that developed without any evident cause. A 59-year old male com-plained of pain of the left hip and a fever. An MRI fat suppression image showed a high signal intensity area located mainly on the obturator externus muscle and mild pooling of joint fluid. After admission to our hospital, administration of antibiotics and NSAIDs quickly improved the hip pain. In addition, laboratory examinations showed reduced inflammation within two weeks. Two months after the initial diagnosis an MRI indicated that the high signal intensity area of the obturator externus muscle had returned to normal. It is necessary to consider not only coxitis but also obturator externus muscle pyomyositis for patients with coxalgia.
