melanoma

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melanoma:

see skin cancerskin cancer,
malignant tumor of the skin. The most common types of skin cancer are basal cell carcinoma, squamous cell carcinoma, and melanoma. Rarer forms include mycosis fungoides (a type of lymphoma) and Kaposi's sarcoma.
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Melanoma

 

melanoblastoma; a malignant tumor that consists of melanin-producing cells.

Factors conducive to the development of melanomas include injury and hormonal stimulation, especially during puberty. Melanomas generally occur on the skin; less often, they appear on the retina, pia mater, nasopharynx, larynx, esophagus, and mucosa of the intestine and other organs. Melanomas usually develop at the site of pigmented or depigmented birthmarks, but they may also appear elsewhere. The process starts with a barely perceptible, painless tumor on the skin, sometimes resembling a wart, which gradually becomes dark brown or black. Occasionally, it ulcerates and bleeds. In case of injury, the tumor may enlarge quickly and become tuberous, dense at the base, and stiffer. The regional lymph nodes enlarge. The initial signs that a melanoma is developing at the site of a birthmark are the birthmark’s enlargement, an intensification or reduction in its pigmentation, and the appearance of a red rim around it. Treatment involves prompt surgical intervention, based on early diagnosis, and the use of radiotherapy and drugs to retard the growth and reproduction of the cells.

I. IA. SHAKHTMEISTER

melanoma

[mel·ə′nō·mə]
(medicine)
A malignant tumor composed of anaplastic melanocytes.
A benign or malignant tumor composed of melanocytes.

melanoma

Pathol a malignant tumour composed of melanocytes, occurring esp in the skin, often as a result of excessive exposure to sunlight
References in periodicals archive ?
Primary malignant melanoma of the urinary bladder is a rare neoplasm (3,4).
However, one finding in this study, which was not similar to our study was the frequency of malignant melanoma, which was the 3rd most common malignant skin lesion after NMSC, while in our study, the 3rd most common malignant skin lesion was cutaneous lymphoma.
To investigate the relationship of NOP14 and human malignant melanoma development, we first analyzed NOP14 expression levels in 40 paired malignant melanoma tissues and melanocytic nevi tissues by IHC.
Primary malignant melanoma of the esophagus is a rare tumor with fatal prognosis.
Sonographic evaluation of clinically occult in-transit and satellite metastases from cutaneous malignant melanoma. Radiol Med.
Malignant melanoma, Clark's grading of malignant melanoma in our study revealed grade 4 and 5.
In another study in North-West Pakistan revealed that BCC was the most common tumor (59%), followed by SCC (31.5%), sebaceous gland carcinoma (6.8%) and malignant melanoma (1.3%).16
Malignant melanoma within squamous cell carcinoma and basal cell carcinoma: is it a combined or collision tumor?--a case report and review of the literature.
Diagnostic performance of whole body dual modality [.sup.18]F-FDG PET/CT imaging for N and M staging of malignant melanoma: experience with 250 consecutive patients.
"And it misdiagnosed fewer benign moles as malignant melanoma, which means it had a higher specificity.

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