Pigmented Free-Floating Iris Cyst in the Anterior Chamber

A 45-year-old man presented with a free-floating cyst in the anterior chamber of his left eye (Fig A-B). Medical history revealed a blunt trauma by firework to the left eye 10 years prior. Anterior-segment OCT scan revealed a cyst in the anterior chamber with hyperreflective walls and clear hyporeflective lumen (Fig C-D). The optical density is comparable with the anterior chamber fluid. The cyst was examined by a pathologist, which resulted in discovery of an iris cyst derived from iris pigment epithelium (hematoxylin and eosin staining) (Fig E). The previous eye trauma may be a specific trigger for the development of the iris cyst (Magnified version of Fig A-E is available online at www.aaojournal.org).