Neuroepithelial cyst and naevus associated with cyst. (A) Slit lamp photograph, right eye, of pigmented iris naevus. Note mild pupil distortion. (B) Higher power showing elevation of the lesion in (A). (C) UBM of the naevus in (A) and (B) demonstrates an associated thin walled neuroepithelial cyst (c, cyst, n, naevus). (D) UBM of a typical peripheral neuroepithelial cyst with a thin cyst wall and anechoic centre (c, cyst). Note angle closure is present in the region of the cyst. (E) Slit lamp photograph, left eye, of a ciliary body melanoma (*) with an associated large neuroepithelial cyst. The cyst is visible at the pupil (arrow). (F) UBM of the patient in (E). A large cyst with features resembling a primary neuroepithelial cyst including thin, highly reflective cyst wall (arrows) is associated with the ciliary body melanoma (not shown).