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Keratinocytic epidermal nevi associated with localized fibro-osseous lesions without hypophosphatemia.
Pediatric Dermatology 2020 July 15
Keratinocytic epidermal nevi (KEN) are characterized clinically by permanent hyperkeratosis in the distribution of Blaschko's lines and histologically by hyperplasia of epidermal keratinocytes. KEN with underlying RAS mutations have been associated with hypophosphatemic rickets and dysplastic bone lesions described as congenital cutaneous skeletal hypophosphatemia syndrome. Here, we describe two patients with keratinocytic epidermal nevi, in one associated with a papular nevus spilus, who presented with distinct localized congenital fibro-osseous lesions in the lower leg, diagnosed on both radiology and histology as osteofibrous dysplasia, in the absence of hypophosphatemia or rickets, or significantly raised FGF23 levels but with distinct mosaic HRAS mutations. This expands the spectrum of cutaneous/skeletal mosaic RASopathies and alerts clinicians to the importance of evaluating for bony disease even in the absence of bone profile abnormalities.
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