The authors interpret a case-report on malignant fibrotic lung histiocytoma diagnosed in a 69 year old female. The patient was admitted for examination because of suspicion of tumor. None of the usual pulmonology tests (sputum cytology, fiberoscopy, bronchus-brush-cytology) could reveal the origin of the change. Upper-lobe resection was done because of the round shadow on the X-ray image of the upper lobe. The pathohistological diagnosis was malignant fibrotic histiocytoma. Combined cytostatic treatment was administered on this patient--after the surgery. She was sinking gradually and died 4.5 months after the resection.
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