leptomeningeal cyst

a·rach·noid cyst

a fluid-filled cyst lined with arachnoid membrane, frequently situated near the lateral aspect of the lateral sulcus of cerebral hemisphere; usually congenital in origin.
Synonym(s): leptomeningeal cyst
Farlex Partner Medical Dictionary © Farlex 2012

leptomeningeal cyst

A commonly used synonym for a growing skull fracture, see there.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

Patient discussion about leptomeningeal cyst

Q. What is the treatment for an arachnoid cyst? My 15 year old son has just been diagnosed with an arachnoid cyst. What is the treatment? Is an operation necessary?

A. An operation is not always necessary, it depends on the size and location of the cyst. I suggest you take your son to a neurologist or a neurosurgeon for further consult.

Q. Is there any problem, if an arachnoid cyst ,2cmx1.5cm size, rostral to cerebellar region left untreated? symptoms: repeated headaches, twitching of muscles, tiredness

A. An arachnoid cyst that leads to symptoms usually needs treatment. Mild symptoms as you suggested are ok to left untreated however gradual onset of new symptoms may arise such as seizures, paralysis and other complications, therefore once symptoms occur one should consider treatment.

Q. info on arachnoid cyst in the right posterior fossa

A. Basically it's like a small sac filled with fluid. The problem is that the skull is a rigid closed space, which means that if there's something other than the brain, it'll occupy space, usually on expense of the brains' space. These kinds of problems are often referred to as "space occupying lesion".

It's usually congenital (i.e. develops during pregnancy), and even when it cause symptoms they develop slowly.

YOu can read more here (http://en.wikipedia.org/wiki/Arachnoid_cyst)

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References in periodicals archive ?
INTRODUCTION: A growing skull fracture (GSF) is also known as Leptomeningeal cyst, due to development of a cystic mass lesion filled with cerebrospinal fluid.
Since then, cases of GSF continue to appear in the literature under varied terminologies like leptomeningeal cyst, traumatic meningocoele, cerebrocranial erosion, cephalohydrocoele, meningocoele spuria, etc.
Our patient differ from usual cases in terms of comminuted type of fracture, involvement of a large area (Fronto-temporo-pareital), extensive dural defect, rupture of leptomeningeal cyst and spillage of CSF along with contused brain underneath the galea aponeurotica.
(7.) Taveras JM, Ransohoff J: Leptomeningeal cysts of the brain following trauma with erosion of the skull.
MRI confirmed the presence of a significant dural rent with formation of a leptomeningeal cyst (Figure 2).
The complication of leptomeningeal cyst formation following linear skull fractures in young children, though rare, has been identified since the nineteenth century beginning with John Howship's report in 1816.17 Most of the data and observations contributing to the hypotheses of the pathophysiology have been reported in the 20th century.
It is imperative that the dura be closed in this procedure for persistence of an opening is associated with a high recurrence of the leptomeningeal cyst. (16) Ventriculoperitoneal shunting has been advocated when the dura cannot be closed, in advanced and recurrent cases, or cases complicated by hydrocephalus.
Children under 2 years old with leptomeningeal cysts from a linear fracture develop these "growing" fractures, which typically occur within 6 months of the injury and widen with time.