Osteoma Cutis Arising in Common Blue Nevus (Blue Osteonevus): A Clinicopathologic, Immunohistochemical, and Dermoscopic Study

Abstract: Osteonevus of Nanta is a rare histopathologic variant of melanocytic nevus that results from ossification of the dermis between dermal nests of melanocytes. Most cases described in the literature have been associated with long-standing intradermal nevi and were often located in the upper part of the body. We report a lesion on the shoulder of an elderly man showing the association of a common blue nevus and osteoma cutis, an exceptional feature which has been previously reported in 2 instances. We also describe for the first time the dermoscopic appearance of this "blue osteonevus." Correspondence: Luis Requena, MD, Department of Dermatology, Fundación Jiménez Díaz, Av. Reyes Católicos 2, 28040 Madrid, Spain (e-mail: lrequena@fjd.es). The authors declare no conflicts of interest. Copyright © 2018 Wolters Kluwer Health, Inc. All rights reserved.

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