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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 |