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We present 9-year-old fraternal twins from a family with piebaldism, having congenital depigmented macules and meeting the diagnostic criteria for neurofibromatosis type 1 () due to the multiple café-au-lait macules (CALMs) and intertriginous freckling at the same time. It's still a debatable issue that CALMs and intertriginous freckling may be seen in the clinical spectrum of piebaldism or these patients should be regarded as coexistence of piebaldism and . However, based on recent literature and our patients' findings, we suggest that this rare phenotypic variant of piebaldism may not need the careful clinical follow-up and molecular testing for . Besides, it may be suitable that these individuals with piebaldism showing -like clinical phenotypes should be further tested for and gene mutations.
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http://dx.doi.org/10.5021/ad.2019.31.5.567 | DOI Listing |
Dermatol Online J
December 2024
Department of Dermatology, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Sapporo, Japan.
Lichen planus pigmentosus (LPP) is recognized as a rare variant of lichen planus, characterized by dermal hyperpigmentation. Specifically, a particular intertriginous variant of LPP is known as lichen planus pigmentosus inversus (LPPI). In our case, the patient presented with symmetric, hyperpigmented dark brown patches mainly in axillary areas, closely resembling the features of acanthosis nigricans (AN).
View Article and Find Full Text PDFPediatr Neurol
August 2025
Second Faculty of Medicine, Department of Biology and Medical Genetics, Charles University and Motol University Hospital, Prague, Czech Republic.
Background: Legius syndrome (LGSS) is a rare neurocutaneous disorder that is differentiated from neurofibromatosis type I (NF1) based on pathogenic variants in the SPRED1 gene (15q14). Similar to NF1, LGSS also presents with café-au-lait macules on the skin and sometimes intertriginous freckling; however, the other diagnostic features of NF1 are absent in LGSS. Clinical contradistinction from NF1 is important for an LGSS diagnosis, but molecular genetic confirmation is necessary.
View Article and Find Full Text PDFJ Med Case Rep
May 2025
Department of Dermatology, Skin Diseases and Leishmaniasis Research Center, Isfahan University of Medical Sciences, Hezar Jarib Street, Isfahan, 81746-73461, Iran.
Background: Acanthosis nigricans is a skin condition characterized by dark, thickened plaques, typically found in intertriginous regions such as the groin and neck. While commonly associated with obesity and insulin resistance, acanthosis nigricans rarely presents on the scalp. This case report highlights an uncommon presentation of acanthosis nigricans.
View Article and Find Full Text PDFBiomed Pap Med Fac Univ Palacky Olomouc Czech Repub
April 2025
Department of Preclinical Disciplines, Faculty of Medicine and Pharmacy, University of Oradea, Oradea, Romania.
Neurofibromatosis type 1 (NF1) is an autosomal dominant disorder caused by mutations in the NF1 gene. The most important signs are café-au-lait spots, intertriginous freckling, and neurofibromas. The disease has a progressive course, the penetrance is almost complete, and reduces life expectancy by approximately 15%.
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