Pseudocyst of the auricle.

Pseudocyst of the auricle is an intracartilaginous collection of serous or serosanguineous fluid resulting in a noninflammatory cystic swelling of the upper ear. The histology is distinctive, consisting of an intracartilaginous cavity due to cartilaginous degeneration and replacement by fibrous tissue. The condition is likely due to ischemic necrosis of auricular cartilage. Inappropriate therapy may result in a permanent deformity of the auricle.