Abstract
Special cases of aspergillosis of the paranasal sinuses and their histological findings are described. All showed unilateral chronic sinusitis of long duration. Surgery disclosed crumbly cheese-like substances in the sinuses, which corresponded to old fungal masses. The diagnosis was only possible by histological examination, usual staining methods were sufficient. Contrary to opinion that basic illness or defects of the immune system also caused by therapy would be a disposing factor for the fungal infection it was demonstrated that such cases are found spontaneously. Anatomical abnormalities of the nasal space can favor infection. Radical operation was the successful therapy.

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