Walsh & Hoyt: Pathology

Meningiomas range in size from tiny to massive. The characteristic gross appearance is a globular, solid growth firmly attached to the inner surface of the dura, producing an excavation of the underlying neural tissue. The cut surface of a meningioma may have a reddish or brown discoloration from hemorrhage within the tumor. In some cases, the tumor contains one or more large cysts, whereas in extremely rare cases, the tumor is totally cystic. In other cases, particularly in infants and young children, there is a large cyst located adjacent to the tumor. Tumors with extensive hemorrhage, cyst formation, or advanced mucoid or fatty degeneration usually have a soft, spongy consistency. Other tumors, however, have a tough, fibrous consistency. Still others contain extensive areas of calcification and are ""gritty"" to palpation.