Huge Mediastinal Thymic Cyst in the Elderly Patient.

Mediastinal thymic cysts are uncommon lesions. Thymic cysts are usually diagnosed incidentally, and their origin could be congenital or acquired. Herein we present the case of a patient who presented with dyspnea. Chest computerized scan showed a large cystic mass. Surgical excision was performed. Pathology findings were consistent with congenital thymic cyst.