PLEOMORPHIC ADENOMA AS A PRIMARY MEDIASTINAL TUMOR

16 YEARS AFTER THE PAROTIDECTOMY WITH THE DIAGNOSIS OF PLEOMORPHIC ADENOMA

Abstract

A 64-year-old man was admitted to the surgical ward with the diagnosis of a mediastinal mass. He had a pleomorphic adenoma of left parotis gland remored at 48 years of age.
The tumor was located posterior to the left pulmonary artery, and it was clearly separated from the lung by the parietal pleura.
A histological examination revealed a typical pleomorphic adenoma composed of myxoid stroma and myoepithelial cells. And there was component of bronchial epithelial cells that compressed at the edge of the mass. Therefore, this mediastinal mass is not a metastatic tumor from the neck, but a primary one of teratomatous origin in the mediastinum.
It is the second case of pleomorphic adenoma in the mediastinum as a primary lesion.