Generally with piriformis syndrome there will not be any lower back pain and there is usually a less well defined point of injury. (sportsinjuryclinic.net)
But sometimes it's caused by piriformis syndrome, which is when the bandlike piriformis muscle (it extends from your sacrum to the top of your thigh bone) squeezes the sciatic nerve. (health.com)
This can lead to sciatica symptoms due to a condition known as piriformis syndrome. (sportsinjuryclinic.net)