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Investigation and diagnosis

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Authoring team

  • plain radiographs will not assist in the diagnosis of piriformis syndrome (PS)

  • Electromyograms (EMGs) may reveal abnormalities in the tibial and peroneal divisions of the sciatic nerve

  • CT and MRI can help differentiate PS from other possible causes of sciatica and can be used to directly determine the diagnosis of PS by revealing an enlarged piriformis muscle

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