[Massive benign pleural schwannoma].

Schwannoma is a neoplasm of the peripheral nerve sheath that develops from schwann's cells. Pleural involvement is uncommon, and typically originates from an intercostal nerve of the posterior-superior mediastinum to then extend along the parietal and mediastinal pleura. We report a case of benign schwannoma of the right hemithorax, which we believe to be the largest ever reported at this time. The clinical presentation, acute respiratory failure, was unusual. The imaging findings of this tumor are described.