[Differential diagnosis of round lung lesions--isolated tumor-like amyloidosis]

One case of isolated tumorlike amyloidosis of the lung is reported. The patient was found by mass radiographic survey. Before operation the histological diagnosis was unknown. The specimen of lung from thoracotomia showed tumorlike amyloidosis and independent from amyloidosis sarcoid granulomatosis of uncertain cause. Isolated tumorlike amyloidosis of the lung is a very rear diagnosis. Thus diagnosis before operation is very difficult. In case of circular focus of undetermined etiology surgical intervention is indicated to avoid delayed resection of bronchial carcinoma.