Obturator internus abscess and superior ramus osteomyelitis: A case report in a pediatric patient

Obturator internus muscle (OIM) abscess associated with pelvic superior ramus osteomyelitis is a rare condition, most often described in children following trauma or strenuous muscular activity. Positive blood cultures, when present, are typically due to Staphylococcus aureus. We report the case of a 12-year-old male who presented to the Emergency Department at Prince Ali Military Hospital, Al-Karak, in March 2024 with fever and right hip pain. Magnetic resonance imaging (MRI) confirmed an OIM abscess with superior ramus osteomyelitis. Culture of drained pus and soft tissue samples grew Staphylococcus aureus. The patient underwent surgical drainage and received intravenous antibiotics, which led to full recovery. This case highlights a rare presentation of OIM abscess with associated pelvic osteomyelitis. Early recognition, timely surgical drainage and debridement, combined with systemic antibiotic therapy, can lead to excellent outcomes.