Nonsurgical treatment for radicular of pain of zygoapophyseal joint cyst origin: therapeutic selective nerve root block.

We report the first case of zygoapophyseal joint cyst-induced radicular pain successfully treated with therapeutic selective nerve root block. A 56-year-old dentist presented with pain involving the lateral thigh, lateral calf, and foot dorsum that worsened with standing and walking. Magnetic resonance imaging of the lumbar spine showed a cyst emanating from the right L4-L5 zygoapophyseal joint, resulting in central canal and lateral recess stenosis. The patient was treated with two fluorscopically guided therapeutic L5 selective nerve root blocks. The patient remained pain free at 18-month follow-up.