Segmental hypomelanosis and hypermelanosis arranged in a checkerboard pattern are distinct naevi: flag-like hypomelanotic naevus and flag-like hypermelanotic naevus

Journal of the European Academy of Dermatology and Venereology : JEADV
Daniele Torchia, Rudolf Happle

Abstract

The categorization of congenital hypo- or hyperpigmented skin lesions following a segmental pattern has been a long-lasting matter of debate and have been reported under various and often incorrect terms. To reassess published hypomelanotic and hypermelanotic lesions that did not follow Blaschko lines nor a phylloid pattern of mosaicism, we carried out an extensive and critical review of the worldwide literature. Seventy-four retrieved cases consisted of lateralized hypomelanotic lesions arranged in a flag-like pattern or appearing as large patches of grossly oval or angulated shape and sharp, serrated margins. Sometimes lesions harboured maculopapular melanocytic naevi or cooccurred with other segmentally arranged naevi. A probably non-random association with extracutaneous anomalies was also reported on rare occasions. In 70 cases, lateralized hypermelanotic patches were arranged in a flag-like pattern that often appeared as large quadrangular patches. Sometimes lesions harboured Spitz naevi. Ten cases belonged to phacomatosis melanorosea, whereas several others were part of so far uncategorized cases of phacomatosis pigmentovascularis. Flag-like hypomelanosis is a distinct naevus type, for which the term 'flag-like hypomelan...Continue Reading

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Citations

Jul 15, 2020·Genetics in Medicine : Official Journal of the American College of Medical Genetics·Víctor Martínez-GlezPablo Lapunzina
Aug 18, 2020·Journal of the European Academy of Dermatology and Venereology : JEADV·P SharmaR Happle
Aug 28, 2020·Clinical and Experimental Dermatology·D Torchia
Jun 21, 2019·Case Reports in Dermatological Medicine·Chanidapa WongtadaMarisa Pongprutthipan
Feb 16, 2021·Journal of the American Academy of Dermatology·Daniele Torchia, Rudolf Happle

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