Synovial cysts and ganglion cysts are commonly located near peripheral
joints and tendon sheaths. They arise less frequently from spinal fac
et joints. If located intraspinally they might cause a compression of
nerve roots. We report on a patient suffering from severe sciatica due
to bilateral synovial cysts. Bilateral synovial cysts are very uncomm
on lesions. To exclude other compressive tumours an extensive diagnost
ic procedure must be performed.