Pulmonary hyalinizing granuloma: a cause of pulmonary nodules.

The radiological and histological appearance of pulmonary hyalinizing granuloma (PHG) and its pathogenesis are described. The histological features bear a striking resemblance to fibrosing mediastinitis. Patients present clinically with nonspecific respiratory or general symptoms. Slowly growing solitary or, more often, multiple nodules are found on radiographs of the chest, suggesting neoplastic disease. Four patients with PHG are described....