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Besides, what is external hydrocephalus?

External hydrocephalus (EH) is a condition in which infants with rapidly enlarging heads are found to have a CT scan that shows widening of the subarachnoid space with mild or no ventricular dilation.

Also Know, what is benign enlargement of the subarachnoid space? Benign enlargement of subarachnoid space (BESS) in infancy is the most common cause of macrocephaly and characterized clinically with large head circumference, normal or mildly motor and language delay and increased cerebrospinal fluid (CSF) in the subarachnoid space with normal ventricles or mild ventriculomegaly.

Also to know, how common is benign external hydrocephalus?

Hydrocephalus is a relatively common neuropediatric condition, with an incidence of about 0.9 per 1,000 births [106, 170]. It is defined as the abnormal accumulation of cerebrospinal fluid (CSF) within the ventricles and/or subarachnoid spaces, leading to an increase in intracranial pressure (ICP) [77].

What causes benign extra axial fluid of infancy?

The most probable cause is immaturity of the arachnoid villi, which is responsible for absorption of the cerebrospinal fluid (CSF). [4] Later on, this excess CSF is reabsorbed on maturation of the arachnoid villi. These infants are usually neurodevelopmentally normal and have an excellent prognosis.