Atypical melanosis of the foot showing a dermoscopic feature of the parallel ridge pattern

Department of Dermatology, Ege University Medical Faculty, Izmir, Turkey.
The Journal of Dermatology (Impact Factor: 2.25). 02/2007; 34(1):56-9. DOI: 10.1111/j.1346-8138.2007.00217.x
Source: PubMed


A 62-year-old male Turkish patient had a pigmented lesion on the sole with a 10-year history. It was an asymmetrical macular lesion with an irregular border and irregular brown pigmentation and had a diameter of 1.2 cm x 1.7 cm. Dermoscopy revealed a parallel ridge pattern and an abrupt cut-off of pigmentation on the upper edge. Histologically lentiginous hyperplasia decorated by innocent melanocytes and scattered melanocytic proliferation with slight to moderate cytological atypia were seen. Atypical melanocytes were very scattered and it was insufficient to call it a melanoma in situ. A second finding was a microvascular proliferation located in the papillary dermis. There was no sign of regression such as fibrous tissue or host reaction. Atypical melanosis of the foot has rarely been reported in the published work, which are from Japan and Korea. This case is presented to emphasize the significance of this rare entity which has recently been reported to be a very early phase of acral melanoma.

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    • "Yamaura and colleagues have indicated that dermoscopic observations may be superior to histopathologic methods for the detection of early lesions of acral melanoma owing to the specificity of the parallel ridge pattern during detection of acral melanoma in the histopathologically unrecognizable early-development phase13. Recently, in another interesting report by Kilinc Karaarslan et al., dermoscopic features of the parallel ridge pattern were also shown in AMOF14. These findings support the suggestion that dermoscopic findings can be more critical in a histopathologically incredible early phase of malignancy. "
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