is a tumor?
is a mass of abnormal tissue that arises from normal cells, has no useful
function and tends to grow.
- Cell abnormalities may
include increased size or number, or loss of characteristics that differentiate
their tissue of origin.
- Cells in
malignant tumors have a distorted size, shape and/or structure. Less differentiated
cell tends to grow faster.
- Malignant tumors invade
tissues locally and metastasize in blood or lymph. The stronger the tendency
to metastasize, the more malignant
- Tumors may not cause
pain until they press on or invade nerves.
- Both benign
and malignant tumors can press on nearby structures, block vessels, or produce
excess hormones, all of which can cause death.
- Benign tumors remain
as solid mass that can be removed by surgery if accessible; they can consist
of various tissues and may become malignant.
- Malignant tumors, though
they may remain quiescent for a time, never become benign.
For more detailed information
on tumors, please visit this website!