A 60-year-old female had old pulmonary tuberculosis. Chest radiographs taken in 1980 revealed a small cavitary lesion due to old lung tuberculosis in the right upper lung fields. Chest radiographs taken in 1984 revealed a fungus ball in the cavity and the adjacent pleura was thickened. Chest radiographs taken in 1994, revealed that the margin of the fungus ball had become ill-defined, and infiltrative shadows surrounded the cavity. A test for aspergillus antigen was positive and toxicolor test was elevated in serum. Chest radiographs taken in 1996 revealed that the fungus ball had enlarged substantially. We consider this case to be a semi-invasive pulmonary aspergillosis which spread by direct invasion from an aspergilloma to the surrounding cavitary wall.