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Integumentary System
Tumor Grading
Term | Definition |
---|---|
Grade I | close resemblance to tissue of origin and, thus, retaining some specialized functions |
Grade I | tumor cells well differentiated |
Grade II | tumor cells moderately or poorly differentiated |
Grade II | less resemblance to tissue of origin |
Grade II | more variation in size and shape of tumor cells |
Grade II | increased mitoses |
Grade III | tumor cells poorly differentiated |
Grade III | increased abnormality in appearance with only remote resemblance to the tissue of origin |
Grade III | marked variation in shape and size of tumor cells |
Grade III | greatly increased mitosis |
Grade IV | abnormal appearance to the extent that recognition of the tumor's tissue origin is difficult |
Grade IV | tumor cells very poorly differentiated |
Grade IV | Extreme variation in size and shape of tumor cells |