CELLULAR SCHWANNOMA OF THE BRONCHUS

A cellular schwannoma in a bronchus of a 64-year-old female is reporte d with immunocytochemical and ultrastructural observations. One previo us case arising in the lung has been reported. The tumor formed a 3-cm exophytic mass in a segmental bronchus. Pneumonectomy was performed. The tumor was moderately cellular and devoid of Verocay bodies, and th e spindle cells were immunoreactive for S-100 protein. Electron micros copy revealed schwannian features that were less developed than in a c lassic schwannoma.