19 year old female with severe leg and lower back pain with minor numbness and tingling sensations.. mri came back clear no deformities. sciatica?

Sij piriformis ...: There are other possible causes for this kind of pain including piriformis syndrome where the piriformis muscle wraps around the sciatic nerve. You may also need and EMG to help diagnose your problem.

probably not: Sciatica refers to symptoms of radicular pain, from an irritated nerve root in your spine. An MRI usually would pick that up. You may have a condition called piriformis syndrome, which mimics sciatica. You should undergo an evaluation by a qualified pain management physician to determine if that is the case.

EMG/NCS: can be very helpful in determining issues that may still be from the spine if MRI is not that conclusive. Also it could be a peripheral nerve injury or neuropathy that could cause his pain and the EMG will be helpful in determining this.