Non-traumatic intradiploic arachnoid cyst

Abstract

In this report, we present a case of non-traumatic intradiploic arachnoid cyst in a 65 year-old woman with a slow growing swelling in the right frontotemporal region without a history of head trauma, which was diagnosed intra-operatively. Extradural intracranial location of non-traumatic arachnoid cyst is a rare clinical entity with a few reported cases in the literature. Characteristic features of non-traumatic intradiploic arachnoid cysts are also described in this mini-review article.

An infected arachnoid cyst in an elderly patient

“…50-60 % of intracranial cysts occur in the middle cranial fossa. They are often intradural, although can occasionally be found extradurally in the intradiploic space [5]. Arachnoid cysts can also occur extracranially within the spinal canal either in the intradural or extradural space [2,6].…”

“…One study puts the incidence in males at 1.7 % [9]. In over 50 reports of symptomatic arachnoid cysts in elderly patients [1,[3][4][5]7, 10] the commonest symptom was headaches in 10 cases, followed by dementia and hemiparesis in 9 cases. Other reported symptoms included ataxia, urinary incontinence, seizures, gait, sensory and visual disturbances.…”

Transosseous cerebrospinal fluid fistula 14 years after Chiari decompression: presentation and management

“…A literature search revealed reports of 5 such cases involving the cranial vault as well as a small series of 5 cases all involving the basiocciput. 1,2,4,6,9,22 We report on a young boy with a spinal intraosseous cystic lesion containing CSF that manifested 14 years after a Chiari decompression. …”

Congenital intradiploic arachnoid cyst presenting as painless proptosis

“…[1][2][3][4][5][6][7][8][9] These nontraumatic cystic lesions are presumed to be congenital, with CSF pulsating through a dural defect into the intradiploic space and leading to gradual enlargement with thinning of the inner and outer tables of bone. 1 Given the low pressure of CSF pulsations, Thomas and Rout 1 speculated that the lesions must be initiated before ossification of the cranium because normal CSF pressure would not likely cause intradiploic expansion in otherwise intact bone.…”