The choristoma belongs to marginal problems in ophthalmology, nevertheless it is not negligible, and in the differential diagnosis of the tumors of the conjunctiva and the cornea we must take it into consideration especially in connection with the potential possibility of its malignant progression. The finding of a choristoma may signal a simultaneous occurrence of other lesions of an analogous origin in other localities than that of the bulbus or the orbit, which should lead the ophthalmologist to a complex examination of the patient and an interdisciplinary cooperation with the neurologist, oto-rhino-laryngologist, dermatologist, and others.

Department of Ophthalmology Medical Faculty of the Palacký University Olomouc Czechoslovakia