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"After the review of the literature and our retrospective examination of 20 lesions, we observed three common and constant components, more or less present in all varieties of TSC cutaneous hamartomas (AF, SP, FCP and FCCH):-abundant thickened collagen, associated with adnexal involvement (concentric fibrosis)-vascular hyperplasia,-cellular proliferation of fibroblasts.TSC1 or TSC2 mutations cause a defect in mTOR inhibition and promote cell proliferation but also angiogenesis and vessel modification due to increased production of VEGF by fibroblastic cells carrying the mutation [3,29]."