leptomeninges


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Related to leptomeninges: meningitis, pachymeninges, Leptomeningeal carcinomatosis

leptomeninges

 [lep″to-mĕ-nin´jēz]
(plural of leptomeninx) the two more delicate components of the meninges: the pia mater and arachnoid considered together; the pia-arachnoid. adj., adj leptomenin´geal.

lep·to·me·ninx

(lep'tō-mē'ninks), [TA]
The two delicate layers of the meninges, the arachnoid mater and pia mater (vs. the tough pachymeninx or dura mater), considered together; by this concept, the arachnoid and pia are two parts of a single layer, much like the parietal and visceral layers of a membrane or bursa; although separated by the subarachnoid space they are connected via the arachnoid trabeculae and become continuous where the nerves and filum terminale exit the subarachnoid space (the cerebrospinal fluid-filled space bounded by the leptomeninges).
See also: arachnoid mater, pia mater.

leptomeninges

/lep·to·me·nin·ges/ (lep″to-mĕ-nin´jēz) sing. leptome´ninx   the pia mater and arachnoid taken together; the pia-arachnoid.leptomenin´geal

leptomeninges

[lep′tōminin′jēz]
Etymology: Gk, leptos + meninx, membrane
the arachnoid membrane and the pia mater, two of the three layers covering the brain and spinal cord. Compare meninges.

lep·to·me·nin·ges

(lep'tō-mĕ-nin'jēz) [TA]
The two delicate layers of the meninges, the arachnoid mater and pia mater considered together.
See also: arachnoid, pia mater
Synonym(s): pia-arachnoid, piarachnoid.
[lepto- + G. mēninx, pl. mēninges, membrane]

leptomeninges

plural of leptomeninx; the two more delicate components of the meninges: the pia mater and arachnoid considered together; the pia-arachnoid.
References in periodicals archive ?
meningitidis serogroup C was identified within blood vessels and in neutrophilic infiltrates in the leptomeninges (Figure 2) (3,4).
Pathologically there is brown discoloration of the leptomeninges of the cerebellum (especially the vermis), basal frontal lobe, olfactory bulb, temporal cortex, brainstem, cranial nerves, spinal cord, nerve roots, ependyma and subpial tissue of < 3 mm deep.
For 1 of the patients, who had confirmed DTV infection by molecular analysis, a detailed histopathologic analysis showed lymphocytic infiltrates, which in the leptomeninges and perivascular spaces contained predominantly CD4+ helper T cells and in the brain parenchyma predominantly CD8+ cytotoxic T cells (10).
Postmortem gross examination of the brain demonstrated profound edema and normal-appearing leptomeninges.
A moderate inflammatory infiltrate of predominately heterophils was present in the leptomeninges.
32) Cryptococcus affects immunocompromised patients and calcifications can be seen in both the brain parenchyma (33) and the leptomeninges.
Meningitis is best demonstrated on MR imaging by intense linear enhancement of the leptomeninges, especially at the basal cisterns.
8) The explanation for this wide range of neoplastic phenotypes is that cells of the neural crest also contribute to the formation of leptomeninges, bone, cartilage, and muscle in the head, neck, and face.
CT of brain usually did not show evidence of acute disease, but in about one-third of patients, magnetic resonance imaging showed enhancement of the leptomeninges, the periventricular areas, or both.
13) There is enhancement of the pachymeninges because they have no blood-brain barrier, contrary to the leptomeninges, which have an intact blood-brain barrier and no enhancement.
Of the solid tumors, breast cancer, lung cancer, and malignant melanoma are the most common to metastasize to the leptomeninges (1).
Neurosarcoidosis (Figure 17) is an inflammatory granulomatous process, which has a predilection for the leptomeninges.