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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 ...
Skin cancer is the most common form of cancer, globally accounting for at least 40% of cancer cases. [5] [20] The most common type is nonmelanoma skin cancer, which occurs in at least 2–3 million people per year. [6] [21] This is a rough estimate; good statistics are not kept. [1]
Evolution of a 4 mm nodular melanoma. Nodular melanoma (NM) is the most aggressive form of melanoma. [1] It tends to grow more rapidly in thickness (vertically penetrate the skin) than in diameter compared to other melanoma subtypes. [2] Instead of arising from a pre-existing mole, it may appear in a spot where a lesion did not previously exist.
Any diagnosis of melanoma is cancer even if the term ‘malignant’ is not used before it.
Melanoma, meanwhile, is a type of skin cancer that can spread to other areas of the body. The main cause of both is exposure to ultraviolet rays, which come from the sun and are used in tanning beds.
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]
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