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Large anterior skull base meningioma

Lithograph plate from Cruveilhier’s “Anatomie Pathologique du Corps Humain” showing a large anterior skull base meningioma destroying the olfactory nerves and invading the cribriform plates (Cruveilhier 1829-1853). (Image edited by Dr. Douglas J Lanska to improve exposure and contrast, and to correct a color cast. Public domain.)