Colobomatous cysts of optic nerve
Objectives of publication:presentation of a rare clinical observation from our own practice.Key points:colobomatous orbital cyst with microphthalmos — rare anomaly of an embryonal development of an eyeball, it is formed owing to “filling” of an optic nerve with the intraocular liquid coming to him from a vitreous chamber through сoloboma of disk because of violation of hydrodynamics in a forward segment of an eye. Usually this anomaly is combined with microphthalmic eye, though cases of a colobomatous cyst with a normal size of an eyeball, and also with other anomalies of development of an eye (inferior uveoretinal coloboma, prepupillary membrane, corneal opacity) are described.Сlinical observation:during 2015 in our department there were two children to whom after the carried-out inspection the diagnosis of a colobomatous cysts of optic nerve has been exposed. Concerning the first child waiting tactics has been recognized expedient, at repeated surveys in 1 and 4 months of any dynamics in the ophthalmologic status it hasn’t been revealed. To the second child because of the expressed exophthalmos with lagophthalmia, with perforation threat, surgical intervention – a puncture and drainage of a cyst of an optic nerve is performed. After operation the correct situation and mobility of an eyeball were restored, xerotic changes of a cornea and conjunctiva have decreased.Conclusions:from the pathogenetic mechanism of cystous formation of an orbit, it is more logical to specify the clinical diagnosis a mention in him an optic nerve – “сolobomatous cysts of optic nerve”. Surgical treatment depends on the sizes of cyst, degree of exophthalmos and existence of complications.