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Clear cell meningioma variant and clinical aggressiveness.
Clinical Neuropathology 1998 May
The few reports about clear cell meningiomas (CCM) point to an inordinate clinical aggressiveness despite their histological benignity. We studied 5 CCM aiming to assess their clinicopathological, cytometric, and ultrastructural features. Two patients were females and 3 males, with a mean age of 36 years. Two tumors were spinal, one of the cerebral convexity, one of the tentorium-clinoid region, and one of the base of the skull. The first 3 were totally removed and have not recurred for a mean follow-up time of 40 months. The tentorium-clinoid and the skull base tumors had radical subtotal and partial resections, and recurred after 16 and 1.5 months, respectively. All tumors but one, a non-recurrent one, presented no signs of histological anaplasia. The proliferative capacity, as assessed by MIB-1 staining index (SI), of recurrent tumors was slightly higher than that of those tumors that did not recur. All cases showed DNA diploid pattern. Amianthoid-type fibers were disclosed on ultrastructural study. CCM arose in patients younger than those with other variants of meningioma, the spinal canal and the posterior fossa were the common sites. Finally, intracranial tumors were linked to an aggressive behavior.
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