Abstract
In patients with malignancy the most frequent granuloma-associated conditions are tumor-related sarcoid reactions, sarcoidosis, tuberculosis and other infections. Quite often, the finding of granuloma-tous lesions in patients with cancer may lead to difficulties of interpretation resulting in inappropriate treatment of both granulomatous disease and malignancy. This problem is reviewed and exemplified by a number of typical case histories. A systematic diagnostic approach must integrate anamnestic, clinical, histomorphological, immunohistological and laboratory information. In addition, prolonged follow-up may be necessary in order to establish the true nature of a granuloma-associated condition.

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