I have the exact pains you have and was told my MRI results were normal but after receiving my health records today, I see that there is an hemangioma in the T11 vertebral body.
Thanks for using the forum. I am happy to address your questions, and my answer will be based on the information you provided here. Please make sure you recognize that this forum is for educational purposes only, and it does not substitute for a formal office visit with a doctor.
Without the ability to examine and obtain a history, I can not tell you what the exact cause of the symptoms is. However I will try to provide you with some useful information.
Vertebral hemangiomas are common tumors incidentally found on neuro-imaging, mostly in the thoracic region. They typically have a benign, asymptomatic course, but rarely they will enlarge and can cause pain, fracture, etc. These lesions typically do not require treatment. If a patient has pain and a hemangioma is found, other causes of pain should be evaluated.
The buttock pain would not be caused by a lesion at T11. Have you had your lower back (lumbar and sacral regions) imaged?
I would suggest you discuss your pain with your physician. You may benefit from physical therapy.
Thank you for this opportunity to answer your questions, I hope you find the information I have provided useful, good luck.