Due to the bad prognosis of the affected eye, the patient underwent to orbital exenteration procedure. B-mode ultrasonography revealed a mass involving the iris, ciliary body and the choroid coat with perilesional retinal detachment, suggesting iris ciliary body and choroid melanoma. On biomicroscopic examination, using a slit lamp, it was observed an iris distension that was protruding directly into the anterior chamber and a diffuse opacity of the lens. On the ophthalmic examination, the right eye possessed misshapen pupil, hyperemia ocular conjunctiva (+) and diffuse corneal opacity (+) with paracentral pigmentation between 7-10 hour. On the clinical examination, no abnormality was found. The owner initially presented a history of a progressive increase dark-colored intraocular volume in the right eye iris of the dog. The objective of this study is to report a case of iris melanoma involving the ciliary body and the choroid coat of a Poodle, emphasizing its clinical manifestation, diagnosis and treatment.Ĭase : This study reports a case of an intact male canine Poodle, 15 years old, weighing 5 kg that was referred for care to the Veterinary Teaching Hospital of the Federal University of Santa Maria, Brazil. Current treatment of choice is based on the size and the structures involved by the tumor that can range from local resection to orbital exenteration. A complete eye examination and ocular ultrasound will lead to the diagnosis that will be further confirmed through histopathology. Old animals are more affected than the young ones and there is no breed predilection. The ocular melanomas have a low metastatic level in dogs when compared to cats. Mestrado, Programa de Pós-graduação em Medicina Veterinária (PPGMV), Universidade Federal de Santa Maria (UFSM), Santa Maria, RS, Brazil.īackground : Melanoma is a primary ocular neoplasm that may affect the iris, ciliary body, the choroid coat and others components of the eye. A prostaglandin analogue, such as travoprost, may be used if the intra-ocular pressure is elevated.Doutorado, Programa de Pós-graduação em Medicina Veterinária (PPGMV), Universidade Federal de Santa Maria (UFSM), Santa Maria, RS, Brazil. To subdue inflammation, topical corticosteroids can be used. If the pupil can be fully dilated during the treatment of iritis, the prognosis for recovery from synechia is good. Dilation of the pupil in an eye with synechia can cause the pupil to take an irregular, non-circular shape (dyscoria) as shown in the photograph. Mydriatic or cycloplegic agents, such as topical homatropine, which is similar in action to atropine, are useful in breaking and preventing the formation of posterior synechia by keeping the iris dilated and away from the crystalline lens.
This blocked drainage raises the intraocular pressure. In posterior synechia, the iris adheres to the lens, blocking the flow of aqueous humor from the posterior chamber to the anterior chamber. Posterior synechia also cause glaucoma, but with a different mechanism. It is sometimes visible on careful examination but usually more easily through an ophthalmoscope or slit-lamp.Īnterior synechia causes closed angle glaucoma, which means that the iris closes the drainage way of aqueous humour which in turn raises the intraocular pressure.
Synechiae can be caused by ocular trauma, iritis or iridocyclitis and may lead to certain types of glaucoma. Ocular synechia is an eye condition where the iris adheres to either the cornea (i.e. Misshapen pupil due to Iritis-caused synechia in the left eye
0 kommentar(er)
