Subdural hygroma secondary to rupture of an intracranial arachnoid cyst: description of 2cases and review of the literature.

The appearance of a subdural hygroma after the rupture of an arachnoid cyst wall is extremely rare, with very few cases described in the literature. Most cases are due to a traumatic cause. The therapeutic approach in symptomatic cases is controversial, with a current tendency toward conservative management initially. In those cases that require surgical treatment, multiple therapeutic options are available, with fenestration techniques being recommended as first-line treatment. We describe 2cases treated in our centre and review the literature.