PubMed · 3692591
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S Kumar, B Prakash, R L Sengar, V Puri. 1987. Arachnoidal cysts.. https://pubmed.ncbi.nlm.nih.gov/3692591/
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Pachymeninx and leptomeninx of cranial cavity and spine are considerably different in their collagenous fiber texture, cellular composition, vascularization, and innervation. The majority of meningeal nerve fibers terminate as free nerve endings whereas encapsulated and lamellated nerve terminals additionally occur in higher vertebrates including man. With respect to nerve fiber classification, arborization pattern, topography, and organization of the microenvironment at the termination site afferent and efferent nerve terminals are differentiated. Only the dura mater and the pial subcompartment of the leptomeninx possess the morphological prerequisites for neurogenic inflammation. In the current review, the results of morphological studies regarding the meningeal innervation including the sites of CSF (cerebrospinal fluid) production and absorption are discussed with emphasis on their structure-function relationships.
We studied the anatomic relationship between arachnoid granulations in the transverse sinus and the termination of the vein of Labbé in 57 consecutive angiograms. Patients with pathology in intracranial venous structures or with inadequate image quality of the venous system were excluded. Arachnoid granulations were found in 12 of the 57 patients (21.1%), always at the junction of the vein of Labbé and the transverse sinus; the vein of Labbé was present in 55 patients (96.5%), most often without associated arachnoid granulations; the latter, however, were not observed in the absence of a vein of Labbé. This study confirms the close, constant anatomic relationship between arachnoid granulations in the transverse sinus and the termination of the vein of Labbé. This observation may help to differentiate arachnoid granulations from pathologic conditions involving the transverse sinus such as dural sinus thrombosis. The constant character of this relationship suggests a developmental role of afferent veins in the formation of arachnoid granulations.
BACKGROUND: Arachnoid granulation can sometimes show hypertrophy, developing extensively apart from the venous sinus, and in that case, a differential diagnosis should be made between this granulation and tumors. In this case, we hypothesized that cerebrospinal fluid was absorbed in the region of abnormal stains revealed by angiography. CASE DESCRIPTION: A 67-year-old female with headache was admitted to our hospital. A plain radiograph revealed accumulated numerous osteolytic lesions in the right frontal bone. T1-weighted magnetic resonance (MR) images demonstrated mixed-intensity lesions. On the T2-weighted MR images, we observed that the lesions were mixed, with areas of the same intensities as gray matter and cerebrospinal fluid. An abnormal vascular stain from the frontal branch of the middle meningeal artery was confirmed. After a craniotomy, numerous white granular masses were observed. These masses had penetrated the dura mater and adhered rigidly to the arachnoid membrane. Histological examination revealed them to be normal arachnoid granulations and villi. CONCLUSION: This case was diagnosed as an ectopic arachnoid granulomatosis. No case report has previously been published describing numerous arachnoid granulations away from the venous sinuses.