What is a brain cyst?

A brain cyst is a cystic fluid surrounded by cerebrospinal fluid in the arachnoid sac. It is most commonly seen in the middle skull base, cerebellopontine angle, suprasellar fossa and posterior cranial fossa. Most lesions show symptoms in early childhood, most commonly manifested as increased intracranial pressure symptoms, such as headache, nausea, vomiting, lethargy, etc. Epilepsy, skull bulge, hydrocephalus, developmental retardation, precocious puberty, etc. Clinically, they are often found by skull CT, skull MRI, cerebrospinal fluid examination, etc. The common hazards are increased intracranial pressure, resulting in brain edema, brain hernia, and finally endangering life.