title: Ultrasound biomicroscopy in the diagnosis of a primary peripheral iris cyst.
abstract: A primary peripheral cyst behind the iris is difficult to detect during a routine slit lamp examination. It is usually asymptomatic unless the cyst is sufficiently large. We report on a 73-year-old woman who underwent phacoemulsification of a cataract and incidentally presented a small dark mass behind the peripheral iris. The lesion was initially suspected of being a melanoma, but it could not be localized by conventional techniques postoperatively. A diagnosis of primary iris cyst was not made until 1 year later when high-frequency ultrasound biomicroscopy (UBM) was employed. UBM displayed a distinct thin-wall cystic lesion (0.5 x 0.8 x 0.6 mm) with low internal reflectivity at the iridociliary sulcus of the inferotemporal quadrant. UBM allows good imaging access to a lesion behind the iris that is otherwise difficult to detect with traditional techniques.
authors.affiliation: Department of Ophthalmology, Chang Gung Memorial Hospital, 5, Fushing Street, Gueishan, Taoyuan, Taiwan 333, ROC. shiuchen@cgmh.org.tw
authors.forename: Shiu-Chen
authors.initials: SC
authors.lastname: Wu
mesh_terms: D000368:Aged; D003560:Cysts / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D007499:Iris Diseases / Q000000981:diagnostic imaging*; D008853:Microscopy; D014463:Ultrasonography