Arachnoid cysts on magnetic resonance imaging: just an incidental finding?

Li, Lucy; Begbie, F; Grimmond, N; Kontorinis, Georgios

doi:10.1017/s0022215120000808

Cited by 4 publications

(4 citation statements)

References 22 publications

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“…To balance the density difference between the CSF and the arachnoid cyst, osmotic processes may come into play. 15 Osmotic activity in arachnoid cysts; can continue until the adjacent tissues' intracranial pressure and mass resistance are reached. The fact that the wall of arachnoid cysts also consists of arachnoid cannot activate the intracystic density difference and osmotic processes to a high degree.…”

Section: Asanmentioning

confidence: 99%

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The Relationship Between Arachnoid Cysts and the Subarachnoid Space by Hounsfield Unit Value in Computed Tomography Scans: Identification of Isolated and Communicating Arachnoid Cysts in a Cohort Study

Asan

2023

Int Clin Neurosci J

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Background: Arachnoid cysts are formations containing cerebrospinal fluid (CSF). They may be associated with the subarachnoid space. This feature is a factor that can affect the change in the size of arachnoid cysts over time. Hounsfield Unit (HU) value measurements provide rational numeric representation of imaging of tissues in computed tomography (CT) examinations. In this study, we aimed to define isolated or communicated arachnoid cysts, and whether arachnoid cysts communicate with the subarachnoid distance, with the HU values obtained in CT examinations. Methods: Patients with radiological diagnosis of arachnoid cyst were identified retrospectively by examining the CT database. HU value measurements were recorded over the Picture Archiving and Communication System (PACS) in the area where the arachnoid cyst was detected. HU value measurements are a method that rationally shows the amount of radiograph absorption of tissues in CT examinations. HU value measurements were performed in cerebrospinal fluid (CSF) and arachnoid cysts, and whether arachnoid cysts had equal HU values with CSF. They were defined as homogeneous or heterogeneous by measuring HU values in different regions of arachnoid cysts. Results: Data on 478 cases were obtained. An average of 2.82 CT scans were detected per case. A change in arachnoid cyst size was detected in 47 (9.8%) cases. In cases of arachnoid cysts of varying size, the mean HU value of arachnoid cysts was 9.32±1.93 (6.43±1.67 in the lateral ventricle and 7.04±1.71 in the fourth ventricle). HU value of arachnoid cysts with a change in size significantly differed from CSF. Conclusion: Arachnoid cysts with HU values equal to CSF are not real arachnoid cysts, and significant volume changes are not expected. Arachnoid cysts, which have a different HU value than CSF, may secrete a different fluid from CSF. This type of arachnoid cyst is a real cyst that can be detected in various sizes on CT examinations at different times since they are not in communication with the subarachnoid space.

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Section: Asanmentioning

confidence: 99%

“…

IntroductionArachnoid cysts are the most common intracranial cysts detected in 1% of all intracranial space-occupying lesions. 1,2 Acquired forms of arachnoid cysts are rarely encountered. 3 The most common cause is trauma in their acquired forms, which occurs due to the entrapment of cerebrospinal fluid (CSF) within the arachnoid scar tissue.

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confidence: 99%

The Relationship Between Arachnoid Cysts and the Subarachnoid Space by Hounsfield Unit Value in Computed Tomography Scans: Identification of Isolated and Communicating Arachnoid Cysts in a Cohort Study

Asan

2023

Int Clin Neurosci J

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“…Arachnoid cysts result from defects in the fusion of two layers of the arachnoid membrane during the early fetal period, which leads to a cyst's formation with cerebrospinal fluid accumulation between the two arachnoid membranes [1,2]. Arachnoid cysts account for 1% of nontraumatic space-occupying lesions in the skull [3,4]. Most arachnoid cysts in children are congenital [5,6], while in adults, they can be primary, congenital, or develop secondary to trauma, tumor, or infection [5].…”

Section: Introductionmentioning

confidence: 99%

“…The most common location is the middle cranial fossa (4/6), followed by the posterior cranial fossa (1/6), and the suprasellar, frontal, cerebral convexity, interhemispheric fissure, and quadrigeminal cistern (1/6) [2,7]. Arachnoid cysts are more common in children than adults [8], and Sylvian arachnoid cysts account for 40-50% of all intracranial cases [3]. In this case report, we emphasize the importance of a case-based surgical approach in hemorrhages associated with arachnoid cysts in the Sylvian region.…”

Section: Introductionmentioning

confidence: 99%

A rare case of bleeding into the Sylvian arachnoid cyst: A case report

Karakoc

Sarica

2023

J Surg Med

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Arachnoid cysts are primarily developmental in origin and constitute rare, benign lesions. Sylvian arachnoid cysts may infrequently present with subdural and/or intracystic hemorrhage. Hemorrhage is typically of venous origin and occurs due to stretching and tearing of bridging veins, depending on minor traumas. The annual risk of bleeding associated with Sylvian arachnoid cysts, with no additional complaints other than headache and an asymptomatic course, has been reported to be 0.04%. Symptoms can range from headache to coma, depending on the mass effect after hemorrhage. If there is no clinical evidence linking the arachnoid cyst, it is sufficient to perform surgery only for the hematoma without resecting it. In this case report, we present a rare instance of hemorrhage due to a Sylvian arachnoid cyst that developed after trauma and was observed in a patient who came to our clinic with a headache. In our patient, the cyst-dependent left parietal subdural hemorrhage was evacuated through a burr-hole craniotomy, and a closed-system drainage with a Hemovac drain was applied for 48 hours. During post-operative follow-up, complete resorption of subdural and intracystic hemorrhages was observed. A case-based surgical approach is necessary for bleeding due to arachnoid cysts in the Sylvian region.

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