arachnoid cyst

Resolución clínica de un hematoma subdural crónico en un niño con quiste aracnoideo conocido.

Chronic subdural haematoma is a well-known and relatively frequent entity in the elderly. It is originated by a slight trauma which provokes subdural veins to rupture after suffering stretching due to cortical atrophy.
We report the case of a 11 year old patient with a previous known arachnoid cyst who was diagnosed as chronic subdural haematoma without association to cranial trauma and with slight neurological impairment. He responded successfully to pharmacological therapy. The following clinical case permits review pathophysiology of chronic subdural haematoma and considers subarachnoid cyst as a risk factor.

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Palabras clave: Hematoma subdural crónico, quiste aracnoideo, traumatismo craneoencefálico,

Keywords: arachnoid cyst, chronic subdural haematoma, Head injury,

Quiste Aracnoideo de Presentación Ictal.

Arachnoid cysts are benign cystic cavities surrounded by membranes that are indistinguishable from the arachnoid membrane. They contain cerebrospinal fluid in contact with the subarachnoid space. They are frequently asymptomatic and incidentally diagnosed in the adult. Their clinical onset is variable and depends on their size and possible triggering factors. We report a case in which a big arachnoid cyst presented in an unusual way, not finding a background or any triggering factors that might justify this clinical presentation. It is necessary to perform a differential diagnosis from other common affections of sudden onset. Surgical treatment by cystoperitoneal shunting resulted in a complete resolution of symptoms.