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Subdural hygromas require two conditions in order to occur. First, there must be a separation in the layers of the Meninges of the brain. Second, the resulting subdural space that occurs from the separation of layers must remain uncompressed in order for CSF to accumulate in the subdural space, resulting in the hygroma. [1]
The books lists ICD-O codes, CNS WHO grades and describes epidemiological, clinical, macroscopic and histopathological features, among others. [2] The following is a simplified (deprecated) version of the fifth edition.
Cerebral cavernous malformation (CCM) is a cavernous hemangioma that arises in the central nervous system.It can be considered to be a variant of hemangioma, and is characterized by grossly large dilated blood vessels and large vascular channels, less well circumscribed, and more involved with deep structures, with a single layer of endothelium and an absence of neuronal tissue within the lesions.
This list features both the added and removed subtypes. Also, 22 ICD-9-CM codes were updated. [2] The ICD codes stated in the first column are those from the DSM-IV-TR. The ones that were updated are marked yellow – the older ICD codes from the DSM-IV are stated in the third column.
Cavernous hemangiomas located in the brain or spinal cord are referred to as cerebral cavernomas or more usually as cerebral cavernous malformations (CCMs), [13] [2] and can be found in the white matter, but often abut the cerebral cortex. When they contact the cortex, they can represent a potential seizure focus for the patient.
Cerebrospinal fluid is produced by the choroid plexus in the ventricles of the brain and contained by the dura and arachnoid layers of the meninges. [23] [42] [64] The brain floats in CSF, which also transports nutrients to the brain and spinal cord. As holes form in the spinal dura mater, CSF leaks out into the surrounding space.
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[10] Cystic hygromas that develop in the third trimester, after 30 weeks' gestation, or in the postnatal period are usually not associated with chromosome abnormalities. A chance exists of recurrence after surgical removal of the cystic hygroma. The chance depends on the extent of the cystic hygroma and whether its wall was completely removed. [10]