By Josep Malvehy, Ralph P. Braun, Susana Puig, Ashfaq A. Marghoob, Alfred W. Kopf
The increase in acclaim for dermoscopy has intended that extra practitioners desire a prepared connection with seek advice in a medical context the place better atlases are much less useful. this convenient textual content encompasses a wealth of pictures and algorithms to aid in a place diagnosis.Table of Contents
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The pigment is found in the crest, and thus the openings of the eccrine ducts can often be seen in the center of the pigmented lines. This pattern is called the parallel ridge pattern In benign nevi, the individual structures tend to be homogeneous and the structures are distributed in a symmetric manner. For example, a lesion may have central globules, peripheral reticulation and symmetrically distributed dots. Most nevi with a multicomponent pattern are either congenital or dysplastic. In melanoma the individual structures tend to be atypical/irregular and the structures are distributed asymmetrically This pattern does not have any diagnostic implications.
Structureless (homogeneous) areas are more frequently observed than in common melanocytic nevi. Dots, globules, black blotches, network, vascular patterns and colors can vary greatly within the lesion. Segments of the margin of DN can be abrupt. Generally, DN lose some or all of the architectural order (symmetry, uniformity, sparseness of colors) seen in common melanocytic nevi. Compared with common melanocytic nevi, which are usually less than 6 mm in diameter, it is not exceptional for DN to be 10–15 mm or more in largest diameter.
Absence of a network, dots/globules, branched streaks, vessels, regression and/or additional colors. The presence of any of these additional structures should alert one to the possibility of nodular primary or metastatic melanomas which, on occasion, may dermoscopically mimic blue nevi. xp 9/11/05 9:20 am Page 47 ■ Blue nevi can undergo focal fibrosis, causing mottled white scar-like areas within the lesion. ■ Blue nevi tend to gradually fade in color into the surrounding skin. Combined nevi Definition A combined nevus is composed of two or more distinct cell populations, which are usually reflected clinically by different colors and more clearly demonstrated by visualization with the dermoscope.