Extradural archnoid spinal cysts are rare lesions. Their localization is usually the thoracic spine. Clinically, they are a cause of spinal cord and/ or nerve roots compression. The diagnosis is made by magnetic resonance imaging (MRI). The pathophysiology is not well known and seems to be different from intradural lesions. The best treatment is surgery. We report the case of a 5-year-old girl with spinal cord compression symptoms who was treated by open surgery. We performed dural defect repair. The outcome was good in the immediate post operative period without complication and total recovery.

We report a case of a 4-month-old girl presenting congenital proptosis with progressive increase. CT scan revealed an intraorbital mass without bony defect. The patient was operated, and resection was subtotal. Histologically, the tumor was composed of glial tissue with plexus choroid and pathologist concluded glial heterotopia. The child is under constant medical supervision because recurrences can be observed after incomplete resection; she had no new clinical signs at 18 months follow-up.

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