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[A 9-year-old boy with 'pinpoint pain' caused by pyomyositis]
M Schots1, R Verlaak, P H Haarbrink
1Canisius Wilhelmina Ziekenhuis, Nijmegen.
Background:
Pyomyositis is a rare bacterial infection of striated muscle, usually caused by Staphylococcus aureus.
Case Description:
A healthy 9-year-old boy was referred to us because of pain in the hip and fever. We noticed he could point to the pain with one finger; this is referred to as 'pinpoint pain'. An MRI indicated a diagnosis of pyomyositis of the iliacus muscle and piriformis. The infection was caused by S. aureus. The boy recovered completely and swiftly with antibiotic therapy.
Conclusion:
This specific type of pyomyositis in the hip is rare, especially in children. Being able to localise the pain with one finger is a typical characteristic of this condition. MRI is the investigation of first choice to confirm this diagnosis.
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