Transformation of corneal epithelial cyst into anterior chamber implantation cyst and scleral cyst: a rare occurrence.

An 8-year-old boy underwent a penetrating keratoplasty for a corneal epithelial cyst. After surgery an anterior chamber implantation cyst appeared. Repeated Neodymium:YAG (Nd:YAG) laser treatments failed to eradicate this cyst; it later extended into the sclera together with the collapse of the anterior chamber cyst. The possible mechanism underlying the development of these cysts is discussed.