A new method that can dramatically improve the sensitivity and especially t
he specificity of skin naevi screening for melanoma by physicians is introd
uced. The method is based on measuring the similarity to previously classif
ied naevi images. As more naevi are being classified, the power of the meth
od is enhanced. Thus physicians can benefit from experience accumulated by
others and the screening can be performed effectively by physicians with le
ss experience. (C) 2000 Lippincott Williams & Wilkins.