melanoma

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Related to amelanotic melanoma: Nodular melanoma

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 ?
Grange, "Sarcoid granuloma simulating amelanotic melanoma of the iris: a case report," Journal Francais d'Ophtalmologie, vol.
A primary amelanotic melanoma of the vagina, diagnosed by immunohistochemical staining with HMB45, which recurred as a pigmented melanoma.
The rarity of our case is the presence of amelanotic melanoma in palatine tonsil.
A clinicopathologic study of amelanotic melanoma. Surg Gynecol Obstet 1972; 135:917-20.
Timeline of a melanoma patient who used a sunbed during her teenage years and again during her 30s, and developed an invasive amelanotic melanoma 2 years after experiencing a bad sunburn from a sunbed.
But their roles in the disease pathogenesis are still unclear.3,9 In immunohistochemistry (IHC) low molecular weight keratin (LMWK), epithelial membrane antigen (EMA), carcinoembryonic antigen (CEA), gross cystic disease fluid protein 15 (GCDFP-15), CD15 (Leu MI) are positive, also myoepithelial cells in S100 and smooth muscle actin (SMA) are positive.4,10 Clinical differential diagnosis includes Bartholin's duct cyst or abscess, epidermal inclusion cyst, mucous cyst, fibroma, lipoma, leiomyoma, endometriosis, amelanotic melanoma and squamous cell carcinoma.1,3,4,11
The tumour cells were negative for HMB-45 stain, thus ruling out the possibility of amelanotic melanoma.
The differential diagnosis of angiosarcoma includes haemangioma for the better differentiated lesions, Kaposi's sarcoma for those with a predominantly spindle component, and carcinoma or amelanotic melanoma for the poorly differentiated types.2
Nodular BCC may mimic adnexal neoplasms, intradermal melanocytic nevi, Merkel cell carcinoma, or even amelanotic melanoma.
The problem was, however, that a fairly large number of amelanotic melanoma lesions were seen to grow in the lung [6].
Amelanotic conjunctival naevi may mimic lymphoma, papilloma, CIN III, squamous cell carcinoma or amelanotic melanoma. Of note the aforementioned lesions do not have cysts.
An online textbook recommends either excision or shave (with or without curettage), but advises surgical excision with histologic confirmation for pyogenic granuloma lesions that can't be differentiated with certainty from amelanotic melanoma, which typically grows more slowly.