Eighteen patients with intracavitary pulmonary aspergilloma were studied retrospectively in order to compare the findings of CT with those of plain chest radiograph. The air meniscus sign was observed in 10 patients on chest radiograph and in 9 patients on CT CT scans also showed peripheral small round air density in 12 patients and sponge-like air shadow within low density mass in 3 patients. The diagnosis of ill intracavitary aspergilloma was suggested on both CT and plain radiograph in case that air-meniscus sign was visible. However. when air meniscus sign was not identified, CT scans could add more diagnostic informations over chest radiographs such as small peripheral air density or sponge-like air shadow.hadow.