In two cases histological examination of the lymph nodes excised during mediastinoscopy showed non-caseous epithelioid granulomas. In one patient with hilar lymphadenopathy sarcoidosis was misdiagnosed. One-year later progression of lesions in lungs was found and adenocarcinoma was diagnosed. In second patient with tumour in chest x-ray examination after misdiagnosed sarcoidosis thoracotomy was done and histological examination of samples from tumour showed nonsmall cell lung cancer. In both carcinomatous cases sarcoid reaction was recognised.
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