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The word melanoma has a long history of being used in a broader sense to refer to any melanocytic tumor, typically, but not always malignant, [170] [171] but today the narrower sense referring only to malignant types has become so dominant that benign tumors are usually not called melanomas anymore and the word melanoma is now usually taken to ...
Acral lentiginous melanoma is a result of malignant melanocytes at the membrane of the skin (outer layers). [2] [3] The pathogenesis of ALM remains unclear, however injury or mechanical stress might play a role in its development. [17] [18] Unlike cutaneous melanoma, it is not caused by sunlight or UV radiation. [10]
Clear cell sarcoma is a sub-type of a rare form of cancer called a sarcoma. [1] It is known to occur mainly in the soft tissues and dermis.Rare forms were thought to occur in the gastrointestinal tract before they were discovered to be different and redesignated as gastrointestinal neuroectodermal tumors.
Lentigo maligna is a histopathological variant of melanoma in situ. [6] Lentigo maligna is sometimes classified as a very early melanoma, [7] and sometimes as a precursor to melanoma. [8] When malignant melanocytes from a lentigo maligna have invaded below the epidermis, the condition is termed lentigo maligna melanoma. [2]
Superficial spreading melanoma (SSM) is a type of skin cancer that typically starts as an irregularly edged dark spot typically on sun-exposed part of the body. [ 2 ] [ 3 ] The colour may be variable with dark, light and reddish shades; occasionally no color at all. [ 2 ]
A malignant blue nevus is a cutaneous condition characterized by a sheet-like growth pattern, mitoses, necrosis, and cellular atypia. [ 1 ] [ 7 ] : 701 Micrograph of a blue nevus showing the characteristic pigmented melanocytes between bundles of collagen .
However, a melanocytic nevus is benign, and melanoma is malignant. Most melanocytic nevi never evolve into a cancer, with the lifetime risk for an individual nevus being 1 in 3000 for men and 1 in 11 000 for women. [5] Moreover, dermatologists have a standardized system for determining whether a skin lesion is suspicious for malignant melanoma.
Data on the chances of transformation from melanocytic nevus to melanoma is controversial, but it appears that about 10% of malignant melanomas have a precursor lesion, of which about 10% are melanocytic nevi. Therefore, it appears that malignant melanoma quite seldom (1% of cases) has a melanocytic nevus as a precursor. [9]