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Sand tumor --> psammomatous meningioma

(Science: tumor) A firm cellular neoplasm derived from fibrous tissue of the meninges, choroid plexus, and certain other structures associated with the brain, characterized by the formation of multiple, discrete, concentrically laminated, calcareous bodies (psammoma bodies); most of these neoplasms are histologically benign, but may lead to severe symptoms as a result of compressing the brain.

Synonym: angiolithic sarcoma, sand tumor, virchow's psammoma.