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Amelanotic melanoma is a type of skin cancer in which the cells do not make any melanin. [1]: 696 [2] They can be pink, red, purple or of normal skin color, and are therefore difficult to diagnose correctly. They can occur anywhere on the body, just as a typical melanoma can.
Although a nevus and a melanoma are often treated as independent entities, there is evidence that a nevus can be a precursor for a melanoma. [1] Common mutations have been identified in nevi and melanomas. [2] [3] [4]
Desmoplastic melanoma, also known as neurotropic melanoma, or spindled melanoma [1] is a rare cutaneous condition characterized by a deeply infiltrating type of melanoma [2]: 696 with an abundance of fibrous matrix. It usually occurs in the head and neck region of older people with sun-damaged skin.
Melanoma is the most dangerous type of skin cancer; it develops from the melanin-producing cells known as melanocytes. [1] It typically occurs in the skin, but may rarely occur in the mouth, intestines, or eye (uveal melanoma). [1] [2] In women, melanomas most commonly occur on the legs; while in men, on the back. [2]
Melanocytic tumors of uncertain malignant potential (MELTUMP) are melanocytic lesions in the dermis that cannot be classified by morphology as either benign naevi (moles) or malignant melanomas because the mass shows features of both.
Uveal melanoma is a type of eye cancer in the uvea of the eye. [4] It is traditionally classed as originating in the iris , choroid , and ciliary body , but can also be divided into class I (low metastatic risk) and class II (high metastatic risk). [ 4 ]
Melanoma with features of a Spitz nevus (Spitzoid melanoma) Melanoma with small nevus-like cells (small cell melanoma) Mucosal melanoma; Nevoid melanoma; Nodular melanoma; Polypoid melanoma; Seborrheic keratosis-like melanoma; Soft-tissue melanoma (clear-cell sarcoma, melanoma of the soft parts) Superficial spreading melanoma (superficially ...
Cancer of unknown primary origin (CUP) is a cancer that is determined to be at the metastatic stage at the time of diagnosis, but a primary tumor cannot be identified. A diagnosis of CUP requires a clinical picture consistent with metastatic disease and one or more biopsy results inconsistent with a tumor cancer.