Mystery of the Bulging Orbit

A 31-year-old woman presents with blurred vision and progressive proptosis. Explore the Differential Diagnosis for a cystic, retrobulbar lesion on MRI.

Hydatid cyst


A 31-year-old woman living in Greece presented with a 4-week history of blurred vision and 2 weeks of progressive bulging of her left orbit. On examination there was nontender proptosis of the left eye, paresis of the left abducens nerve, and reduced visual acuity in the left eye. A T2-weighted gadolinium-enhanced magnetic resonance image of the brain is shown. What is the most likely diagnosis?

What is the most likely diagnosis?

Retrobulbar abscess
Hydatid cyst
Optic-nerve glioma
Orbital dermoid cyst
Foreign body

Echinococcus granulosus, Hydatid cyst, Ophthalmology, Orbital Lesion, Proptosis

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