Webster's New World Medical Dictionary

carcinogenic
Having a cancer-causing potential.
carcinoma
Cancer that begins in the skin or in
tissues that line or cover body organs. Examples are
carcinoma of the breast, colon, liver, lung, pan-
creas, prostate, or stomach.
carcinoma, large cell
See 
large cell carci-
noma.
carcinoma, squamous cell
Cancer that begins
in squamous cells, which are thin, flat cells that
resemble fish scales. Squamous cells are found in
the tissue that forms the surface of the skin and the
lining of some organs of the body. See also 
carci-
noma in situ, squamous cell.
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carcinoma, squamous cell
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carcinoma, transitional cell
Cancer that devel-
ops in the lining of the renal pelvis, ureter, or blad-
der.
carcinoma in situ
Cancer that has stayed in the
place where it began and has not spread to neigh-
boring tissues (for example, squamous cell carci-
noma in situ).
carcinoma in situ, squamous cell
An early
stage of skin cancer that develops from squamous
cells (the flat, scale-like cells in the outer layer of
the skin). The hallmark is a persistent, progressive,
slightly raised, red, scaly, or crusted plaque that may
occur anywhere on the skin surface or on mucosal
surfaces, such as in the mouth. Under a micro-
scope, atypical squamous cells are seen to have pro-
liferated through the whole thickness of the
epidermis (the outer layer of the skin) but not
beyond. Squamous cell carcinoma in situ is com-
monly caused by sun exposure, but can be from
prolonged exposure to arsenic. Also known as
Bowen disease.