Pyogenic sacroiliitis is a relatively rare cause of hip pain and fever. Psoas muscle
abscess complicating pyogenic sacroiliitis, has been reported in some cases; however,
piriformis muscle abscess causing sacroiliitis has never been described. We report
a 14-year-old girl who developed a piriformis muscle abscess associated with pyogenic
sacroiliitis due to methicillin-sensitive Staphylococcus aureus.
Keywords
Pyogenic sacroiliitis - piriformis abscess - magnetic resonance imaging - drainage
