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The arachnoid and pia mater are sometimes together called the leptomeninges, [11] literally "thin meninges" (Greek: λεπτός "leptos"—"thin"). Acute meningococcal meningitis can lead to an exudate within the leptomeninges along the surface of the brain. [12]
Lung cancer, breast cancer, and malignant melanoma comprise the majority of solid tumors spreading to the leptomeninges. Although rare, meningeal carcinomatosis can arise from cervical cancer. [ 16 ] Only eight cases of MC arising from squamous cell carcinoma of the uterine cervix are previously reported in the literature.
The leptomeningeal collateral circulation (also known as leptomeningeal anastomoses or pial collaterals) is a network of small blood vessels in the brain that connects branches of the middle, anterior and posterior cerebral arteries (MCA, ACA, and PCA), [1] with variation in its precise anatomy between individuals. [2]
The arachnoid and pia mater are sometimes considered as a single structure, the leptomeninx, or the plural version, leptomeninges (lepto, from the Greek root meaning "thin" or "slender"). [2] [3] Similarly, the dura in this situation is called the pachymeninx.
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[3] [17] The inflammation can lead to the formation of scar tissue and adhesion that can make the spinal nerves "stick" together, a condition where such tissue develops in and between the leptomeninges - between dura and arachnoid or pia and arachnoid. [17] This condition can be very painful, especially when progressing to adhesive arachnoiditis.
This is an accepted version of this page This is the latest accepted revision, reviewed on 3 January 2025. Neoplasm in the brain Medical condition Brain tumor Other names Intracranial neoplasm, brain tumour, brain cancer Brain metastasis in the right cerebral hemisphere from lung cancer, shown on magnetic resonance imaging Specialty Neurosurgery, neuro-oncology Symptoms Vary depending on the ...
It is generally located superficially (in the uppermost sections) in the cerebral hemispheres and involves the leptomeninges. It rarely arises from the spinal cord. These tumors are formed through the mitosis of astrocytes. They are found in the area of the temples, in the brain's frontal lobe or on top of the parietal lobe. In about 20% of ...