Abstract
Three cases of pulmonary tuberculosis with formation of cystic cavities and a case of openly and pathologically healed tuberculous cavity are presented. The persistence of a smooth and thin walledcavity in the roentgenogram with the disappearance of tubercle bacilli from the sputum and gastric washings over six months are the criteria for the open-negative syndrome and free of necrotic contents or pyogenic membrane in the lumen of the cavity and transformed cavity wall into a layer of connective tissue are the criteria for the pathological open healing.The choice of whether these cavitary lesions are to be treated surgically or observed on a long-term medical program must be individualized on the merits and status of each case.
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