TBM (Tuberculous meningitis) TBM is the most serious complication of tuberculosis in children and is usually fatal without treatment o tBM always be a part of systemic disseminated tuberculosis TBM often occurs within 1 vear of initial infection, especially in the first 2 to 6 months of infection3 TBM (Tuberculous meningitis) ◆ TBM is the most serious complication of tuberculosis in children and is usually fatal without treatment. ◆ TBM always be a part of systemic disseminated tuberculosis. ◆ TBM often occurs within 1 year of initial infection, especially in the first 2 to 6 months of infection