amelanotic melanoma


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Related to amelanotic melanoma: Nodular melanoma

a·mel·a·not·ic mel·a·no·ma

an anaplastic melanoma consisting of cells derived from melanocytes but not forming melanin.

amelanotic melanoma

A rare, poorly differentiated form of melanoma, which arises in patients with a previous pigmented melanoma, in particular the desmoplastic melanomas.

amelanotic melanoma

Dermatology A rare, poorly differentiated form of melanoma, which occurs in Pts with a previous pigmented melanoma. See Melanoma, Regression.
References in periodicals archive ?
The framework then allowed the immunohistochemical diagnosis of metastatic amelanotic melanoma. On April 2009 the patient underwent further excision of four nodes of which only one had metastases.
Development of cutaneus amelanotic melanoma in the absence of a functional tyrosinase.
An amelanotic melanoma appears similar to lymphoma, squamous cell carcinoma or other non-pigmented conditions, such as pyogenic granuloma, a conjunctival haematoma, a foreign body or argyrosis.
"A potential clinical clue to the diagnosis of amelanotic melanoma may be the presence of a macular rim or spot of tan, gray, or brown pigmentation at the periphery of the lesion," Ms.
In this series, OLN and one case of amelanotic melanoma were clinically diagnosed as polyps.
Primary amelanotic melanoma of the breast: combating a rare cancer [published online ahead of print October 27, 2010].
Melanoma is frequently pigmented and an amelanotic melanoma must be distinguished from other simulating lesions.
(In fact, even in the absence of pigment, any "red and white" lesion could be an amelanotic melanoma.) However, when added to other findings, such as a firm, pearly papule, the finding increases the likelihood of BCC.
A case of a secondary amelanotic melanoma of the epiglottis was reported by Ikeda et al in 1991.
The remaining four lesions included one amelanotic melanoma and three with none or only one of the ABC criteria.
The tumour is uniformly brown or bluish black, although it can present as grey, purple or in red shades.[9] In an amelanotic melanoma, the pigment is absent.
Such cases of amelanotic melanoma in situ lack classical morphologic features and may thus easily elude clinical diagnosis.