Publication date: Available online 3 August 2017
Source:Annales de Dermatologie et de Vénéréologie
Author(s): M. Dumas, L. Blum, E. Begon
IntroductionLe phénomène de Renbök désigne le respect, par une seconde dermatose, d'une zone de peau touchée précédemment par une première dermatose. Nous présentons le premier cas de phénomène de Renbök au cours d'un érythème migrant (EM), épargné par une toxidermie, et faisons une revue exhaustive de la littérature.ObservationUne patiente de 60 ans était traitée par amoxicilline pour un EM du genou droit. Sept jours plus tard, elle développait une toxidermie à type d'exanthème maculopapuleux généralisé, respectant avec une nette délimitation la plaque d'EM. Le diagnostic de phénomène de Renbök était posé.DiscussionLe phénomène de Renbök a été décrit en 1981 par Cochran et al., qui avaient constaté le respect, par une toxidermie, d'un site antérieurement irradié pour tumeur. Depuis, une quarantaine de cas ont été rapportés. La plupart décrivent des plaques de psoriasis anciennes épargnées lors d'une pelade. La principale hypothèse physiopathologique proposée est l'existence d'un état réfractaire sur une zone topographique donnée, où une modification de l'environnement cytokinique induit par la première dermatose empêcherait la seconde de se développer.ConclusionLe phénomène de Renbök est l'inverse du phénomène de Köbner. Nous décrivons le premier cas au cours d'une phase primaire de borréliose compliquée de toxidermie aux aminopénicillines. Ce phénomène clinique spectaculaire et rare de non-chevauchement entre deux dermatoses est une source d'enseignements sur la physiopathologie de la réponse inflammatoire cutanée.IntroductionRenbök phenomenon describes the inhibition of a lesion when a different one appears. We describe the first case of Renbök phenomenon occurring in a context of erythema migrans (EM) spared by an amoxicillin-induced skin rash and we also present a literature review.Case reportA 60-year-old patient was treated with amoxicillin for EM on the right knee and subsequently developed generalized erythema as a result of an antibiotic-induced skin rash, with sparing of the area previously affected by EM. Renbök phenomenon was diagnosed.DiscussionIn 1981, Cochran et al. first described a maculopapular drug reaction, which spared the sites of previous X irradiation for a tumor. Since then, nearly 40 cases have been reported, mostly describing patient with alopecia areata of the scalp with hair growth within plaques of psoriasis. One of the mechanisms suggested is a role played by cytokine cross-regulation in competition among distinct immune responses.ConclusionWe report the first case of Renbök phenomenon involving EM spared by a drug reaction. This phenomenon provides an insight into inflammatory response competition within a single patient.
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Πέμπτη 3 Αυγούστου 2017
Toxidermie à l’amoxicilline épargnant une plaque d’érythème migrant : phénomène de Renbök et revue de la littérature
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