Meningiomas of the Foramen Magnum

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Article Information

Present address: Department of Radiology, University of Southern California School of Medicine, Los Angeles, Calif.

© AANS, except where prohibited by US copyright law.

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Figures

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    Anteroposterior projection of foramen-magnum region with the contrast medium covering the clivus. Note thinning of the column of oil caused by the odontoid (O), the vertebral artery (VA) and posterior inferior cerebellar artery (PICA).

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    Lateral projection of foramen magnum, illustrating contrast substance in interpeduncular fossa, stopping at the arachnoidal septum. Note proximity of anterior margin of column of oil to the vertebral bodies and clivus. This interval in the region of the odontoid should not exceed 4 mm.

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    Lateral projection of an air myelogram, showing abnormally increased odontoid-arachnoid space (arrows). Air in the cisterna magna indicates an incomplete block (A).

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    Lateral projection of oil myelogram (same case as in Fig. 3) showing widened space anterior to the arachnoid (A) and an apparent complete block to the oil with a smooth concave border at the cephalic end of the column of oil (B).

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    Lateral myelogram. Note smooth concave dorsal defect produced by the tumor with almost complete block (arrows) and no increase in the odontoid-arachnoid interval because of the dorsolateral position of the tumor.

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    Case 1. Low-power microphotograph of the cervical cord, demonstrating cavitation of anterior horns and central grey matter with relative preservation of the periphery of the spinal cord.

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    Case 2. Low-power photomicrograph of lower cervical cord showing preservation of cellular elements and medullated fibres in spite of clinical signs.

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