Cisterna magna meningiomas without dural attachment: Report of two cases

Abstract

Meningiomas within the cisterna magna without dural attachment are extremely rare. To the best of our knowledge, only three cases of meningiomas within the cisterna magna have been reported in the literature. The authors present two cases of patient with the cisterna magna meningioma without dural attachment. (Case 1) A 36-year-old female presented with a 10-month history of numbness in the left hand. Magnetic resonance imaging (MRI) disclosed the presence of a contrast-enhanced tumor in the posterior fossa. A suboccipital craniectomy was performed, and the tumor located within the cisterna magna with no attachment to the dura. Diagnosis is made as clear cell meningioma. The postoperative course was uneventful, and a recurrence has not been observed for three years. (Case 2) A 58-year-old man presented with a well-circumscribed mass in the posterior fossa. At surgery, the tumor located within the cisterna magna with a connection to the right tenia. The tumor was totally removed without neurological deficits. At a 7-year follow-up, no evidence of a recurrence was observed. It is quite difficult to preoperatively diagnose as a cisterna magna meningioma without dural attachment. However, complete removal of the tumor should be achieved.

Meningioma originating from the superior petrosal vein without dural attachment: A case report

“…The stroma of the choroid plexus, tela choroidea, and the leptomeninges surrounding the ventricular region, pineal region, and Sylvian fissure also have arachnoidal cells, accounting for the development of the MWODA[ 8 , 9 ]. Considering previous studies and operative findings, the arachnoidal cells of the leptomeninges in the Virchow-Robin spaces along the superior petrosal vein might be considered the origin of the meningioma in the presenting case.…”