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After reviewing the radiologic appearance of sources of infection, we turn now to those becoming infected by such cases.  The sequence of events is not always easy to elucidate, but tuberculosis in a child is virtually always the result of progression to disease from recently acquired infection.

So-called primary tuberculosis (tuberculosis developing within five years following acquisition of infection) is usually characterized by the so-called primary complex: a peripheral lesion in the lung parenchyma (a) that is not usually identifiable on radiographic examination and associated adjacent lymphadenopathy (b and c).  Intrathoracic lymphadenopathy may also be difficult to identify on the usual pa radiography: it may be entirely hidden behind the mediastinal structures.

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www.tbrieder.org - Updated: 02-Nov-07