Piriformis syndrome caused by rare intramuscular lipoma: A case report

Abstract

We present the case of a 73-year-old man with history of back and left sciatic nerve pain, who came to our hospital centre due to perform a lumbar spine MRI. The MRI scan didn’t reveal compression of the left nerve roots by hernia formations, but collaterally showed a well-defined lesion, with MRI characteristics of adipose tissue, localized in the left piriformis muscle, compatible with a lipoma that displaced the ipsilateral sciatic nerve but did not invade it.