Hi, thanks for writing to HCM.
This is to just to let you know that all other possible causes of sciatica
have to be ruled out before diagnosing your condition as pyriformis syndrome.
There is no single test to diagnose pyriformis syndrome. Physical examination, symptoms presentation, Nerve
conduction tests and MRI
scan may help in diagnosing the condition.
I suggest you to consult an orthopedic surgeon for a detailed evaluation and further management.
Hope this information is helpful. Good day