Welcome to JA and thanks for asking
It is not usual to have a good response and yet the size of the mass in the brain continue to increase in size.
Two possibilities need to be considered here
First is the possibility of a drug resistant TB in which case he will need to repeat a culture sensitivity test. Culture should be done on the blood and CSF as well.
Second thing which should be ruled out is the possibility of some malignant process so if the culture testing doesn,t yield anything and he continue to have a worsening MRI a definite diagnosis will require a brain biopsy to be absolute sure about the cause of this mass lesion
Feel free to ask if you have any more question
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Thanks for sending the report
As i mentioned as the mass lesions are increasing despite being on anti tuberculous therapy so a reevaluation for drug resistance TB or another possibility like a fungal infection or malignancy needs to be ruled out. So he need further investigations as i mentioned above