Fig. 45. Two cases of epithelial iris cyst formation following cataract extraction. A. Instead of forming a flat sheet to cover the posterior cornea and the anterior iris, the invading epithelium has formed a cyst in the anterior chamber. The cyst usually retains some continuity with the original wound but also may become free-floating in the anterior chamber. B. In this case, there is extensive distortion of the iris. The type of ingrowth, sheet or cystic, is a major determinant of the method of treatment used. C. The histologic character of the cyst lining indicates the presence of goblet cells. The origin of these cells may have been from the conjunctiva. In this rare circumstance, the cyst may become filled with mucous. (Hematoxylin-eosin stain; × 101.)