The radiological changes on x-ray take a much longer time to resolve and do leave a scar even after successful treatment of TB. You should not worry about this unnecessarily.
Clinical assessment of treatment progress is largely subjective. Disappearance of clinical symptoms, general well-being, ability to resume normal activities, and weight gain are all pointers to clinical progress. Persistence or reappearance of symptoms plus weight loss – indicates the need for further investigations by sputum microscopy. Erythrocyte sedimentation rate (ESR) and other tests are unreliable and unnecessary in monitoring progress. Clinical assessment is often the only means available for judging progress in extrapulmonary and smear-negative pulmonary tuberculosis: weight gain is a valuable indicator in such cases.
Serial radiography is still preferred by many physicians, though several studies have shown that this can be very misleading for assessing the progress and eventual outcome of treatment. Bacteriologically quiescent disease may be classified as treatment failure because of residual lesions on the x-ray, including cavitation. Patients with persisting bacteriological negativity could show radiographic changes that would be interpreted as deterioration by expert assessors. Assessment by x-ray changes alone can be very misleading.