Tumor - Definition


A tumor is a generic term defining a newly developed tissue within normal tissue. Tumors are caused by dysfunctional cellular development. As opposed to the commonly-held theory, the word "tumor" is not only used for cancerous diseases, but also for other tissue growths that are benign. Qualifying a tumor as malignant (cancerous) or benign (non cancerous) is possible on studying the tumor's aspect by means of medical imaging, but is often confirmed by biopsy, where a sample is taken for analysis. When a tumor is cancerous, it is called a primary tumor if found within an organ, or secondary if the abnormal growth originates from the circulation of tumorous cells.
Published by Jeff. Latest update on December 11, 2013 at 03:57 AM by Jeff.
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