Linear irregular vessels
Linear irregular or serpentine vessels are red vascular structures with a range of size, shape, and distribution .
Linear irregular vessels can be identified in melanoma, basal cell carcinomas, and dysplastic nevi . In one study, 33.3% of melanomas had these vessels, with a PPV of 67.6% . In another study of amelanotic/hypomelanotic melanoma (AHM), linear–irregular vessels were seen in 10.3% of thin AHM (<1 mm), in 0% of thick AHM (>1mm), and 0% in amelanotic/hypomelanotic benign melanocytic lesions. Thus, similar to dotted vessels, the presence of these vessels suggests that the melanoma is still relatively thin.
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