Arachnoid cysts (ACs) are cerebrospinal fluid (CSF)–filled sacs that are responsible for 1% of all intracranial lesions. (1)(2) Although the etiology remains unknown, expert consensus suggests that ACs are developmental anomalies/congenital malformations. Patients with a diagnosis of AC are typically asymptomatic, even if the cyst increases in size. (2) There is no consensus about the ideal age to repeat imaging and how long to radiographically monitor asymptomatic children who have an AC.
This article aims to complement the case previously published by Leite et al (3) about an infant with a postnatal diagnosis of an AC. This follow-up report describes the disappearance of the AC after 3 years. To our knowledge, this is the first reported case of an infant with imaging evidence of the appearance and spontaneous disappearance of an AC. This suggests that ACs may not always be evident at...
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