R. NICKBRYANMDPATRICIA A.HUDGINSMD
Meningiomas arise from arachnoid lining cells, usually around the tips of the arachnoid villi,1 which are found in the walls of intracranial venous sinuses.2 The tip of the arachnoid villi projects into the sinus lumen, while their cavity is continuous with the subarachnoid space and is partly filled with loose arachnoid tissue.1 The villi are probably involved in absorption of cerebrospinal fluid.3 In the posterior cranial fossa, arachnoid villi are present in all the venous sinuses, on the superior surface of the vermis of the cerebellum, and in the CPA.3 They can also be found in the petrous pyramid (internal acoustic meatus, jugular foramen, close to the geniculate ganglion, and along the lesser superficial petrosal nerves).4 Meningiomas may therefore arise in any of the previously mentioned locations.
Radiology Quiz Case 1—Diagnosis. Arch Otolaryngol Head Neck Surg. 2004;130(2):245. doi:10.1001/archotol.130.2.245