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Orbital hydatid cyst: a rare case report

Poster Details

First Author: K. Rifai MOROCCO

Co Author(s):    S. Moutamanni   L. Cherkaoui                 

Abstract Details


To describe the natural history of a patient with an Orbital hydatid cyst .


Orbital localization of hydatid cyst is rare.Its frequency is estimated at 1% of all parasite locations.Hydatidosis is a helminthiasis , a zoonotic infection in humans ,caused by the larval stage of Echinococcus Granulosis.This parasitic infection is endemic in Morocco.The diagnosis is mainly clinical and radiological,and the treatment exclusively surgical.


We report the case of a 56-year-old patient, having a notion of contact with dogs, who presented with unilateral progressive nonpulsatile proptosis of the right eye which appeared 3 months ago, associated with very low visual acuity (see fingers move). The examination found an axile exophthalmos, irreducible, painless, without thrill or murmur, associated with chemosis, lagophthalmos and exposure keratitis. The fundus was inaccessible. The examination of the left eye was normal. Orbital CT and ultrasound in the emergency room were in favor of an orbital hydatid cyst.


The extension examinations revealed an associated hydatid cyst of the liver stage 1.The hydatid serology was negative.The anterior orbital approach allowed puncture and aspiration of the contents of the cyst with its membrane.Macroscopic and anatomopathological examinations confirmed the diagnosis.The evolution was marked by regression of proptosis and lagophthalmos.The patient was operated later for his hepatic hydatid cyst. The orbital involvement of hydatid cyst is often unilateral,affecting mainly the left orbit, characterized by proptosis and periorbital pain or other complications.Radiological explorations characterize the orbital hydatid cyst and guide the therapeutic procedure.The treatment is exclusively surgical and the evolution is generally favorable.


The diagnosis of orbital hydatid cyst should not be overlooked in the presence of unilateral exophthalmos. Although rare, this location is still accessible to surgery. Prevention relies on washing hands thoroughly after contact with a dog, keeping dogs away from food preparation or packaging areas and vegetable gardens, in addition to washing abundantly fruits and vegetables eaten raw.

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