Benign Enlargement of the Subarachnoid Space

  • Etiology: due to immature + inefficient arachnoid villi, causing temporary communicating hydrocephalus
  • Imaging: subarachnoid space relatively larger in infants < 2 years old, subarachnoid vessels cross the space
  • Clinical: presents with macrocephaly, resolves on its own by 2-3 years

Cases of Benign Enlargement of the Subarachnoid Space