Summary Traumatic rupture into the subdural space without evidence of hemorrhage of the arachnoid cysts that localized in middle cranial fossa is a rareanomaly. We described the clinical and radiologic findings of a case 24-year-old man who was presented with a ruptured arachnoid cyst of the middlecranial fossa , and produced a subdural hygroma with trauma. Although arachnoid cysts account for 1% of all intracranial space occupying lesions, theassociation between arachnoid cysts and subdural hygroma is rare and only 23 cases have been previously reported in the literature. There are twoprocedures used in the surgery, the first is cyst fenestration and the second is a cysto-peritoneal shunt. In this patient although we applied all thepossible surgical choices and we couldn?t achieve any slightest regression on radiological findings, the patient had full recovery clinically. Top
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