World Neurosurg
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Only a few cases of intraventricular hydatid cysts have been described. The camalote or water lily sign is described when there is detachment of the endocyst membrane, resulting in a floating appearance like a water lily. ⋯ Here, we describe the camalote sign in an iatrogenically ruptured intraventricular hydatid cyst. Rupture of an intraventricular hydatid cyst poses the threat of widespread dissemination and is described in our case.
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A 38-year-old woman presented with rapidly worsening, painless right monocular vision loss. An examination revealed a visual acuity of 1.4/10 and a central scotoma in the right eye. The orbital magnetic resonance imaging (MRI) showed a well-delineated ovoid intraconal mass of the right eye, hyperintense on T2-weighted MRI with homogenous enhancement after contrast injection. ⋯ A biopsy was performed, and the histopathologic examination yielded a diagnosis of optic nerve sheath meningioma based on a positive antiprogesterone receptor antibody immunostaining. Our case highlights the problem with establishing a specific pathologic diagnosis based on MRI alone, even though the morphologic aspect is evocative. It is recommended to always conduct a histopathologic examination before establishing a specific diagnosis as pathology remains the gold standard, especially when the course of action or treatment may change, as in our case.