Primary obturator internus and obturator externus pyomyositis.

[pyomyositis]

Pyomyositis is a rare condition in immune competent patients and is usually seen in tropical countries . Pyomyositis of obturator muscles in particular is an extremely rare condition , which causes hip pain and mimics septic arthritis .This is a case report of a 9 -year -old boy without an underlying disease or a compromised immune system , who presented with knee pain that progressed to hip pain and inability to bear weight . He was diagnosed initially with septic arthritis of the hip and underwent unnecessary hip exploration surgery . Magnetic resonance imaging scan was performed postoperatively and showed pyomyositis of obturator internus and obturator externus muscles . He was managed medically and had a good outcome .A greater awareness of this emergency condition is necessary to prevent misdiagnosis , unnecessary surgical intervention , and to avoid the devastating possible complications of delayed diagnosis .