Giant cystic lymphangioma of the middle mediastinum.

A middle-aged male presenting with complaint of progressively increasing dysphagia was found to have a large cystic mass lesion in the middle mediastinum on evaluation. A diagnosis of an endo-duplication cyst was considered after exploration, in view of infiltration of the muscular layer of the lower thoracic esophagus, presence of multiple hyperemic nodular lesions on its inner surface and its location in the middle mediastinum. However, the histopathology revealed the lesion to be a cystic lymphangioma.