XXXX . Report of two autopsy cases studied by immunohistochemistry and electron microscopy, and review of 110 cases reported in the literature.

@entity1 @entity712 @entity82 @entity1353 @entity5 @entity615 @entity358 @entity1576 @entity361
Two cases of @entity358 are reported. The @entity1 in the first case was a 61-year-old male with a two-year history of cough and exertional @entity1353 , who died of intractable @entity712 two months after admission without establishment of a diagnosis related to the etiology of @entity712 . Autopsy revealed a sessile @entity5 within the pulmonary trunk and a solitary metastatic lesion in the lung. Histologic, immunohistochemical and electron microscopic studies were performed and a diagnosis of @entity361 was made. The @entity1 in the second case was a 32-year-old male complaining of exertional @entity1353 and @entity615 . Radiologic studies indicated a mediastinal @entity5 involving the pulmonary artery. Exploratory thoracotomy revealed that the mediastinal mass arose from the left pulmonary artery. He died of @entity1576 26 months after onset of his initial symptoms. Histologic, immunocytochemical and electron microscopic studies of both surgical and autopsy materials revealed a malignant @entity82 . One hundred ten previously reported cases of this @entity5 are reviewed, and its clinicopathologic and morphologic features and probable histogenesis are discussed.
