75Se-selenomethionine scintigraphy in mediastinal diseases.

Chest scanning with 75Se-selenomethionine was performed in 59 cases of mediastinal diseases. All cases of vascular diseases, cystic tumors, and benign neurogenic tumor were negatively scanned. Parenchymatous teratoma, thymoma, malignant lymphoma, Castleman's tumor, epithelial tumors, tuberculous lymphadenitis, and sarcoidosis showed high positive rates. In myasthenic thymus without thymoma two out of 15 cases were positive. The scan images of the resected specimens and preoperative chest scannings coincided.