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  • Title: Sarcoidosis of the skin--a dermatological puzzle: important differential diagnostic aspects and guidelines for clinical and histopathological recognition.
    Author: Tchernev G, Patterson JW, Nenoff P, Horn LC.
    Journal: J Eur Acad Dermatol Venereol; 2010 Feb; 24(2):125-37. PubMed ID: 19689445.
    Abstract:
    Sarcoidosis of the skin may have an extremely heterogeneous clinical presentation, so that the definitions of 'great imitator' and 'clinical chameleon' have long been used. There is, in fact, a large group of skin diseases that can enter the differential diagnosis with cutaneous sarcoid manifestations, either clinically or/and pathologically. As the clinical consequences and the prognosis of these groups of diseases are often very different, it is important to correctly plan the diagnostic workup. The diagnostic process in this case often presents a challenge as no single test is sufficiently specific, so that a certain diagnosis can be only made in the presence of a compatible clinical and radiographic picture, along with histopathological evidence of non-necrotizing, epithelioid cell granulomas, and exclusion of other potential aetiologies. For practical reasons, four main groups of skin conditions capable of mimicking sarcoidosis can be identified: (i) transmissible, infectious diseases; (ii) allergic and immunological manifestations of various aetiologies; (iii) granulomatous diseases of various aetiologies; and (iv) lymphomas and pseudolymphomas. The aim of this article is to describe the main clinical and histopathological findings of such disease entities, and to discuss the role of those features (morphological, pathological and laboratory) that can help distinguish them from sarcoidosis of the skin.
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