Patient's question:
Bilateral frontotemporal subarachnoid spaces, anterior longitudinal fissure cisterns, and bilateral lateral fissure cisterns are widened, with corresponding sulci deepened. Bilateral lateral ventricles appear full. Midline structures are centralized. No obvious abnormal density foci are observed in the cerebral parenchyma, and no obvious abnormalities are seen in the skull.Doctor's answer:
Hydrocephalus is a phenomenon where excessive cerebrospinal fluid (CSF) formation or impaired absorption and circulation lead to an overaccumulation of CSF in the ventricles and subarachnoid space. The main causes of hydrocephalus include midbrain aqueductal stenosis, fetal brain infections, neonatal and postpartum meningitis caused by cranial base adhesions, intracranial hemorrhage leading to meningeal adhesions, and tumor pressure forcing poor CSF circulation or absorption. Additionally, when choroid plexus hyperplasia or papillary tumors occur, increased CSF secretion can also cause hydrocephalus, although this is rare. In hydrocephalus, CSF continuously increases in the ventricles, directly leading to elevated intraventricular pressure and ultimately increased intracranial pressure. Simultaneously, the brain substance thins, the brain flattens, and sulci become shallow, resulting in clinical symptoms.