Benign enlargement of the subarachnoid space in infancy

Case contributed by Dalia Ibrahim



Patient Data

Age: 2 months
Gender: Female

Widening of the bifrontal and anterior interhemispheric CSF spaces.

Normal ventricular size, no pressure effects on the surrounding brain tissue, no cerebral atrophy

Case Discussion

Benign enlargement of the subarachnoid spaces in infancy (BESS or BESSI) also known as benign external hydrocephalus (BEH) is, as per the name, a benign enlargement of the subarachnoid spaces in infants. It usually involves the frontal lobe subarachnoid spaces, and it is characterized clinically by macrocephaly or frontal bossing. It's the most common cause of macrocephaly.

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