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SUMMARY:18.3 Tumor Classification
DTSTART;TZID=America/Los_Angeles:20260407T190000
DTEND;TZID=America/Los_Angeles:20260407T200000
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DESCRIPTION: A carcinoma is a malignant change of epithelial cells located in the skin, mucous and serous membranes; for example, adenocarcinoma. A sarcoma is a cancer of connective tissue, e.g. bone cartilage, fat, tendons. For example, osteosarcoma is a malignancy of the bone. A liposarcoma is a malignancy of fatty tissue.
The type of cell of a tumor is also important.

Anaplasia is the loss of normal cellular differentiation or organization.
Desmoplasia means that excessive fibrous tissue formation is present in the tumor stroma.
Metaplasia indicates a change in the type of adult cell to one not normally present in a tissue.
Dysplasia is an abnormal, atypical cellular proliferation that is not a tumor.
Malignant tumors are further classified according to their cellular grade. Tumors are often graded numerically into five grades, the lowest number implying the lowest degree of malignancy.
Mitosis normal cells usually exhibit less than one mitosis per thousand cells, whereas malignancies may...

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