According to your description and the MRI report the cause seems to be intense pressure over the D9/D10 vertebral
area pressing on the spinal column. The pressure is probably because of the Tubercular Osteomyelitis
with intense edema (water accumulation) around the area pressing on the nerve
columns and thus cause the back pain
. If this is so then it is better to release the pressure through the surgery. Moreover the edema is increasing in size as per your saying, which also points towards a surgical intervention.