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[Patient with dyspnoea and gigantic tumor of the chest].

We describe the patient with gigantic chest tumor admitted to the hospital because of dyspnoea. The patient was operated on after the elimination of suspicion of acute pulmonary embolism. Cardiovascular failure was caused by the huge arterial-venous fistula in the tumor and diastolic heart failure were the reasons for dyspnoea. On the basis of the microscopic examination hemangiopericytoma (HPC) was diagnosed--a mesenchymal tumor derived from pericytes. We present in our paper the rules applying to dealing with HPC.