Dermoscopy of a plantar combined blue nevus: A simulator of melanoma
Universita' degli Studi "Magna Græcia" di Catanzaro, Catanzaro, Calabria, ItalyDermatology (Impact Factor: 1.57). 02/2007; 214(2):174-6. DOI: 10.1159/000098579
Dermoscopy allows early detection of melanoma also on acral volar skin. The majority of melanocytic nevi on palms and soles may show three major dermoscopic patterns: the parallel-furrow pattern, the lattice-like pattern, and the fibrillar pattern. Melanomas at these sites are characterized by the parallel ridge pattern. We present the case of a 59-year-old woman who had an oval papule of bluish color, measuring 0.6 x 0.9 cm, localized on her left sole, that had been present, unchanged, for more than 10 years. Dermoscopy showed a parallel ridge pattern. The histopathological examination revealed a combined blue nevus. We present this case to underline that on acral volar skin also intradermal nevi, such as combined blue nevi, may dermoscopically exhibit a parallel ridge pattern, simulating melanoma.
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ABSTRACT: Acral melanocytic nevi have parallel patterns on dermoscopy; however, it is not understood why pigment distributions exhibit such patterns. To clarify the reason why melanin distributions in acral melanocytic nevi exhibit a parallel pattern on dermoscopy. A serial sectioning perpendicular to the skin markings was performed, and each section was stained with modified Fontana-Masson staining to pick out melanin granules. These sections were then reconstructed to three-dimensional images by an image processing software, and these three-dimensional images were analyzed. Melanin columns in the cornified layer were mainly seen in the dermoscopic images of acral melanocytic nevi. In the parallel-furrow pattern melanin columns were arranged vertically, and in the fibrillar pattern they were arranged in a slanting fashion. Melanin columns in the cornified layer, not melanin in the basal layer, mainly contribute to the dermoscopic pattern of acral melanocytic nevi.Dermatology 02/2008; 216(3):205-12. DOI:10.1159/000112927 · 1.57 Impact Factor
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ABSTRACT: Dermoscopy in acquired acral melanocytic nevi has been widely studied. This is in contrast with the little information about the dermoscopic characteristics in congenital acral melanocytic nevi. We report a 46-year-old man who was referred due to a lesion on his right sole present since childhood corresponding to an acral congenital nevus. Dermoscopy showed a homogeneous blue pattern not previously described in acral benign tumors. The homogeneous blue pattern has previously been associated with blue nevus and skin metastasis of melanoma. The recognition of this pattern in benign acral congenital nevi is relevant in the clinical decision making concerning acral tumors.Dermatology 09/2008; 217(4):315-7. DOI:10.1159/000151442 · 1.57 Impact Factor
- European journal of dermatology: EJD 06/2009; 19(4):381-2. DOI:10.1684/ejd.2009.0670 · 1.99 Impact Factor
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