Cutaneous skeletal hypophosphatemia syndrome (CSHS) is a mosaic RASopathy caused by postzygotic, activating pathogenic variants in HRAS, NRAS, or KRAS. It is characterized by congenital epidermal, melanocytic, or sebaceous nevi, elevated FGF23 levels that cause renal phosphate wasting and rickets, and focal bone lesions. We report a 13-year-old girl with CSHS from Argentina.
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