Atypical dermoscopic presentation of an acral congenital melanocytic nevus in an adult: parallel ridge pattern and its histologic correlation

Abstract

Acral melanoma is the most frequent subtype in the Asian and Mexican mestizo populations. Dermoscopy is a noninvasive diagnostic technique that helps the differential diagnosis of pigmented skin lesions on acral volar skin.We, herein, present a case of acral congenital melanocytic nevus with a parallel ridge dermoscopic pattern. Since the parallel ridge pattern in a melanocytic lesion of the acral skin is classically ascribed to melanoma, the present case can be definitely labeled as “atypical” and worth of being elucidated in its histopathological correlates.

Comparison of dermoscopic features between congenital and acquired acral melanocytic nevi in Korean patients

“…did so, but they recruited their patients from France and only included children. Most other reports investigating the dermoscopic patterns of CAMNs have been case series or case reports and did not compare the lesions with AAMNs . Also, mixed benign patterns between CAMNs and AAMNs have not been studied before.…”

“…The distinction between congenital and acquired nevi has been nebulous. Many articles define congenital melanocytic nevi as presenting at birth or becoming apparent shortly after birth . Moreover, some studies were defining congenital nevi as being present at birth or developing during the first years of life .…”