A patient being treated for low back pain with bilateral radiating thigh pain has been seen in physical therapy for six weeks. The patient notes a lack of improvement and feels their symptoms may be worsening. Which of the following new symptom complaints would be the MOST concerning?

1. Sensory disturbance along the posterior thighs
2. Pain radiating to the thoracic spine
3. Inability to fully empty the bladder
4. Weight gain of 5% of body weight

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