[Hemangiopericytoma--rare lung tumor]

Hemangiopericytoma is a mesenchymal neoplasma, originated from pericytes---a cell type surrounding capillaries. Primary localization in the lung is especially rare. We report two cases of hemangiopericytoma of the lung with a completely different clinical outcome: one patient with an asymptomatic, peripheral lung tumor, 18 months disease-free after radical surgical therapy and another one with an advanced lung tumor, that infiltrated the pulmonary artery and caused distant pulmonary metastases. Based on the case report, possibilities and difficulties in the diagnosis as well as therapy of this rare primary pulmonary tumor are discussed.