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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]
Other benign skin lesions that may mimic acral lentiginous melanoma include: Lentigo (sun spots), Acral Nevi (moles), or Onychomycosis (fungal infection of the nail). These skin lesions can appear as dark brown spots, like ALM, but can be distinguished on close examination or dermatoscopy. [7]
Lentigo maligna is the non-invasive skin growth that some pathologists consider to be a melanoma-in-situ. [3] A few pathologists do not consider lentigo maligna to be a melanoma at all, but a precursor to melanomas. Once a lentigo maligna becomes a lentigo maligna melanoma, it is treated as if it were an invasive melanoma.
When used by trained specialists, dermoscopy is more helpful to identify malignant lesions than use of the naked eye alone. [72] Reflectance confocal microscopy may have better sensitivity and specificity than dermoscopy in diagnosing cutaneous melanoma but more studies are needed to confirm this result. [73]
A lentigo (/ l ɛ n ˈ t aɪ ɡ oʊ /) (plural lentigines, / l ɛ n ˈ t ɪ dʒ ɪ n iː z /) is a small pigmented spot on the skin with a clearly defined edge, surrounded by normal-appearing skin. It is a harmless (benign) hyperplasia of melanocytes which is linear in its spread.
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Murphy, George F. "Case 12: Melanocytic tumor of uncertain malignant potential (MELTUMP)". In Artur Zembowicz (ed.). Cases in Dermatopathology: Common Problems in Diagnosis of Pigmented Lesions. Los Gatos, California: Knowledge Books and Software. pp. 73– 80. ISBN 1-74162-088-0
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