Malignant Blue Nevus Arising in a Giant Congenital Cellular Blue Nevus in an Infant


Address correspondence to Yasuhiro Nakamura, M.D., Ph.D., Department of Dermatology, Graduate School of Comprehensive Human Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8575, Japan, or e-mail:


Abstract:  Giant congenital blue nevus (GCBN) is rare and usually occurs on the scalp. Malignant blue nevus (MBN) is also rare and has a poor prognosis. We report a case of MBN arising in a GCBN on the back. There have been three previous reports of MBN associated with GCBN on the trunk; our case had the earliest onset of MBN arising in a GCBN.