Quiste aracnoideo gigante ¿Debe el pediatra alarmarse? a propósito de un caso asociado hemorragia intraquística espontánea.

Background: Arachnoid cysts are benign unilocular masses composed of a collagenous membrane, lined by arachnoid cells, with cerebrospinal fluid. Case report: We present the case of a 9-year-old boy with headache, nausea, and vomiting, with a subsequent diagnosis of a giant arachnoid cyst parietal-temporal-left frontal, with a deviation of the midline to the right, with spontaneous intracystic hemorrhage documented by neuroimaging (brain magnetic resonance imaging without contrast), without behavioral changes, seizures, or deficits in neurological status. A surgical approach was performed with craniotomy and drainage of a subdural blood collection that compressed the adjacent parenchyma with suspected cerebrospinal fluid fistula without signs of intracranial hypertension. Conclusions: Currently, the incidence of arachnoid cysts has increased in pediatric patients, being evident from the third trimester of gestation, with a high prevalence in men and the left hemisphere. A pediatric clinical approach is performed for a convenient approach.