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Larger skin lesions appear more likely to be melanomas
Date:4/21/2008

Skin lesions larger than 6 millimeters in diameter appear more likely to be melanomas than smaller lesions, according to a report in the April issue of Archives of Dermatology, one of the JAMA/Archives journals. The findings suggest that the diameter guidelines currently used by dermatologists to screen for melanoma are useful.

Many clinicians use the ABCDE method to screen for melanoma, according to background information in the article. The criteria are evidence-based guidelines that remind physicians of the features characteristic of melanomaasymmetry, border irregularity, color variegation, diameter larger than 6 millimeters and evolution, or changes in the lesion. However, some researchers argue that strict adherence to the diameter guideline will cause physicians to miss smaller melanomas.

Naheed R. Abbasi, M.P.H., M.D., of the New York University School of Medicine, New York, and colleagues studied 1,323 patients undergoing biopsies of 1,657 pigmented skin lesions or markings suggestive of melanoma. The maximum diameter of each lesion was calculated before biopsy using a computerized skin imaging system.

Of the lesions, 804 (48.5 percent) were larger than 6 millimeters in diameter and 138 (8.3 percent) were diagnosed as melanoma. Invasive melanoma, which has penetrated deeper into the skin, was diagnosed in 13 of 853 lesions (1.5 percent) that were 6 millimeters or smaller in diameter and in 41 of 804 (5.1 percent) lesions that were larger than 6 millimeters in diameter. In situ melanomas, which remain in the skins outer layers, were diagnosed in 22 of 853 (2.6 percent) lesions 6 millimeters or smaller in diameter and in 62 of 804 (7.7 percent) lesions larger than 6 millimeters in diameter.

Within each 1-millimeter diameter range from 2.01 to 6 millimeters, the proportion of melanomas did not vary significantly, remaining stable at 3.6 percent to 4.5 percent, the authors write. However, we observed a nearly 100-percent
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Contact: Pamela McDonnell
212-404-3555
JAMA and Archives Journals
Source:Eurekalert

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