边界清晰、红黄的质地坚韧的脑膜瘤，位于硬脑膜下，临近大脑镰。发生于正中线旁且偏上的部位是相当普通的。

This circumscribed reddish-yellow firm neoplasm beneath the dura next to the falx is a meningioma. The superior parasagittal location is quite common.

硬脑膜下另例良性脑膜瘤，生长缓慢，但症状被发现前，能长的很大。

Here is another benign meningioma beneath the dura. These neoplasms are slow growing, but may reach a large size before symptoms lead to detection.

可见脑膜下的脑膜瘤是如何压迫下面的大脑半球的。浸润性脑膜瘤罕见。

Note how this meningioma beneath the dura has compressed the underlying cerebral hemisphere. Rarely, meningiomas can be more aggressive and invade.

MRI清晰可见右侧一肿块压迫大脑半球。病变特征与脑膜瘤一致。

This is an MRI scan demonstrating a discreet mass along the lateral convexity and extending from a dural base impinging upon the cerebral hemisphere. This is consistent with a meningioma.

尸检中偶然发现的位于蝶骨脊处的脑膜瘤(左上),它是脑膜瘤的另一个好发部位。蝶鞍底位于中间下部，它的上面是灰褐色垂体。垂体的上部及侧部是颈内动脉和大脑前动脉，再稍微向上即是位于中间的视神经(略带黄色)。

An incidental finding at autopsy, this light tan colored meningioma involved the sphenoid ridge, another common location. The base of the sella is seen here, above which is the tan-colored pituitary gland. Above and on each side lateral to pituitary are the internal carotid and the anterior cerebral arteries, above which slightly medially are the optic nerves.

已切除的脑膜瘤。对于神经外科医生来说，切除这类肿瘤相当容易。

Here is a resected meningioma. These are relatively easy for the neurosurgeon to remove.

低倍镜脑膜瘤图像。右边是致密的粉红色结缔组织硬脑膜。脑膜瘤细胞有大量的粉红色胞质。

This is the microscopic appearance of a meningioma of a meningioma at low magnification. Note the dense pink connective tissue dura at the right. The cells of the meningioma have abundant pink cytoplasm.

中倍镜，脑膜瘤由涡漩状细胞巢构成，也可能有多种形状。

At medium power, this meningioma is composed of whorled nests of cells. A variety of patterns are possible.

高倍镜，脑膜瘤中存在饱满的粉红色细胞。可见少量棕色颗粒状含铁血黃素。脑膜瘤也可以有砂粒体。

At high magnification, this meningioma has plump pink cells. A small amount of brown granular hemosiderin is present. Meningiomas may also have psammomma bodies.