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Noun1.leptomeninges - the two innermost layers of the meninges; cerebrospinal fluid circulates between these innermost layers
meninges, meninx - a membrane (one of 3) that envelops the brain and spinal cord
arachnoid, arachnoid membrane - the middle of the 3 meninges
pia mater - the highly vascular innermost of the 3 meninges
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n. leptomeninges, las membranas más finas del cerebro; la piamadre y la aracnoide.
English-Spanish Medical Dictionary © Farlex 2012
References in periodicals archive ?
These include L-PGDS, which is mainly produced by the leptomeninges, arachnoid membrane, and choroid plexus, (26) while soluble amyloid precursor protein (sAPP) is secreted by neurons.
In primates with an acute course of disease that resulted in death, EBOV RNA was not detected in the parenchymal ocular tissues but was consistently detected in the blood vessels of the choroid or ciliary processes or in the optic nerve leptomeninges (29).
It is characterised by large (>20cm) or multiple pigmented nevi along with benign and/or malignant, melanocytic tumours of leptomeninges. Around 120 cases of NCM have been reported in literature till date.
Nonetheless, gross and histologic examination of the leptomeninges remains the most accurate technique in confirming LMC, making postmortem examination an invaluable tool in establishing this pathology.
Meningiomas are slow growing tumors that cause compression of adjacent brain, but some meningiomas destroy leptomeninges and can cause cortical invasion.
MA is a rare benign lesion of unknown etiology, usually affecting cerebral cortex and leptomeninges, but can also involve the brain stem and thalamus [9].
The mechanism for the hydrocephalus may be related with organisms depositing within the choroid plexus or superficial leptomeninges.[24],[25] Acute or old infarction and leukoariosis can also be seen in patients with CM which might be the result of inflammation of perforating arteries due to the fungal invasion along perivascular spaces.[10],[18]
Contrast-enhanced lumbar magnetic resonance imaging (MRI) revealed pathologic contrast enhancement in the leptomeninges, conus medullaris, and cauda equina (Figure 1A, 1B, 1C) and there were 450 lymphocytes/[mm.sup.3] in the lumbar puncture (LP) examination of the patient.
Meningeal melanoma is more likely to develop from leptomeninges (pia, arachnoid) than the pachymeninges (dura).
(1) Most of these are primary cysts arising from congenital defects of cortical formation or as anomalies in the leptomeninges, (2) whereas secondary cysts arise from trauma, infection, or neoplasia.
According to Haddad et al., the term "meningeal sarcoma" designates superficial intracranial sarcomas involving the leptomeninges [16].