26 and 27 In these conditions, the age of onset of angiofibromas is later than in TSC. Therefore, multiple facial angiofibromas remains a major feature for diagnosis when their onset occurs in childhood. In the unusual circumstance when angiofibromas have their onset in
adulthood, they should be considered as a minor feature and the differential diagnosis expanded to include BHD and MEN1. When angiofibromas are few or later in onset, a skin biopsy may be required to confirm the clinical diagnosis. selleck kinase inhibitor The forehead plaque is observed in about 25% of TSC patients and this feature was paired with angiofibromas for the diagnostic criteria in 1998 (Fig 3A). The panel recommended changing the terminology from forehead plaque to fibrous cephalic plaque. This term was created to increase awareness that these fibrous plaques, although
often located unilaterally on the forehead, may occur on other mTOR inhibitor parts of the face or scalp (Fig 3B). Fibrous cephalic plaques, which are histologically similar to angiofibromas, may be the most specific skin finding for TSC. Ungual fibromas were retained as a major feature (Fig 4). The previous designation as “nontraumatic” was eliminated because recall of trauma may be unreliable and trauma may play a role in the formation of TSC ungual fibromas.28 This designation was replaced with the requirement that they be multiple (≥2) because ungual fibromas that occur
in the general population in response to trauma are usually solitary.29 The redundant phrase Bumetanide “ungual and periungual fibromas” was replaced with “ungual fibromas” used to encompass both periungual and subungual fibromas. Ungual fibromas are less common than some of the other TSC skin findings, with a frequency of about 20% overall but as high as 80% in older adults.15, 16 and 28 The greater frequency in adults is due to later onset, typically in the second decade or later.18 and 21 Therefore, their utility in diagnosis is usually limited to adolescents and adults.24 The presence of a shagreen patch was retained as a major feature, but the criterion was updated by deletion of “connective tissue nevus” because this term encompasses a variety of skin lesions with excessive dermal connective tissue that are not necessarily associated with TSC. Shagreen patches commonly take the form of large plaques on the lower back that have a bumpy or orange-peel surface, and this clinical appearance is nearly always specific for TSC (Fig 5). Smaller collagenomas on the trunk exhibit the same histologic changes as shagreen patches but are less specific for TSC because they may also occur as an isolated finding or in other genetic syndromes including MEN1,26 BHD,30 and Cowden syndrome.31 Shagreen patches are observed in about 50% of individuals with TSC and typically have their onset in the first decade of life.
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