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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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The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



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.


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.


A malignant tumor composed of anaplastic melanocytes.
A benign or malignant tumor composed of melanocytes.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.


Pathol a malignant tumour composed of melanocytes, occurring esp in the skin, often as a result of excessive exposure to sunlight
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
[3] "Accuracy of Diagnosis of Choroidal Melanomas in the Collaborative Ocular Melanoma Study," JAMA Ophtalmology, vol.
[5] The Collaborative Ocular Melanoma Study Group, "Assessment of metastatic disease status at death in 435 patients with large choroidal melanoma in the Collaborative Ocular Melanoma Study (COMS): COMS report no.
incidence of ocular melanoma at 60 per million as compared to the 153.5 for cutaneous melanoma, the most common type of melanoma, affecting the skin.
The Collaborative Ocular Melanoma Study Group," Archives of Ophthalmology, vol.
Nevertheless, it has been reported that ocular melanoma may exhibit metastasis free intervals longer than 25 years [20,21].
In a moving interview the mum of two-year-old twins spoke of how her beloved, uncomplaining and superfit husband was robbed of the sight in his left eye - then his life - by ocular melanoma.
In addition to its CMS codes, Cesium-131 is FDA-cleared and holds a CE mark for international sales in seed form for the treatment of brain cancer, prostate cancer, lung cancer, ocular melanoma cancer, colorectal cancer, gynecologic cancer, head and neck cancer and other cancers throughout the body.
It was there that Ron, then 23, was diagnosed with a rare form of cancer - ocular melanoma.
Patients with ocular melanoma liver metastases have a poor prognosis: treatment options are limited, and median survival is less than one year.
Ocular melanoma, which forms in the pigmented layers under the retina, is the most common eye cancer in adults, with approximately 2,000 new cases diagnosed each year.
Critics agreed that while The Mind's Eye could have been just another collection of Sacks's absorbing case studies, what distinguishes this volume is the inclusion of the author's reflection on his own ocular melanoma, which threatens his life.
Ocular melanoma, also called uveal melanoma, is the most common eye cancer and the second-most common form of melanoma, striking about 2,000 adults in the United States each year.