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The term in-situ is a Latin term that means "in position." In the context of melanoma, this means that the malignant melanoma cells remain "in position" in the epidermis, the most superficial layer of the skin.
The following terms are the only terms to be used to determine in situ melanoma:
- Behavior code 2
- Confined to epidermis
- Early melanoma, in situ
- Evolving melanoma in situ
- Intraepidermal, NOS
- Lentigo maligna (unless defined as invasive or unless defined as lentigo maligna melanoma)
- Noninvasive
- Tis
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