Tuberculosis (TB) remains a common disease in the World. Its incidence has
risen steadily since 1985, despite a preexisting continuous decreasing its
frequency due to an effective chemotherapy. Nonwhite people, socioeconomica
lly disadvantaged, chronically debilitated groups and AIDS patients are the
most concerned. Chest radiography remains the first imaging modality to ev
aluate TB. Widely radio-graphic appearances can be encountered, including n
ormal chest X-ray. CT can be useful in all stages of the disease, particula
rly when clinical and radiological findings are in disagreement and/or when
imaging findings are equivocal. CT should be proposed at the end of an eff
ective antituberculous treatment to better subsequently detect fine lesions
suggestive of reactivation TB.