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Given the clinical situation, it is "highly likely" that your son is suffering from tuberculous infection of spine and this will be the diagnosis unless proven otherwise. However, a 100% confirmation can only come from demonstration of acid fast bacilli on smear or a positive culture. Under CT guidance, the abscess
can be aspirated and can be sent for few test- AFB smear, routine pyogenic smaer, AFB culture sensitivity, Pyogenic c/s, Pus PCR for TB. Non invasive option is to give ATT and see clinical response. However, the treatment is highly variable in spine tuberculosis
, the regimen as well as duration. It is further complicated by high prevalance of MDR- multidrug resistance.