Malignant

In reference to an abnormal tissue growth neoplasm (cancer), having the property of locally invasive and destructive growth and metastasis (spreading). Semantics prevail. For example, invasive pituitary tumors are not thought to be malignant.

Mass Effect

Damage to the brain due to the bulk of a tumor, the blockage of fluid, or excess accumulation of fluid within the skull. Damage to the brain due to the bulk of a tumor, the blockage of fluid, or excess accumulation of fluid within the skull.

Medial

The word medial comes from the Latin medialis, from medius, meaning the middle. Medial is the adjective corresponding to the noun median, as in the median in a highway. Pertaining to the middle; in or toward the middle; nearer the middle of the body. Medial is as...