Publication date: Available online 17 April 2018
Source:Annales de Dermatologie et de Vénéréologie
Author(s): E. Melgar, J. Henry, A. Valois, M.-B. Dubois-Lacour, F. Truchetet, B. Cribier, J.-F. Cuny
IntroductionLe granulome de Lever est une affection dermatologique rare qui se localise classiquement sur le visage. Nous rapportons l'observation d'un granulome de Lever extra-facial apparu sur des cicatrices de zona du tronc, ce qui constitue une réaction isotopique particulière.ObservationUn homme de 60 ans consultait pour une lésion cutanée prurigineuse évoluant depuis deux mois. Il avait comme unique antécédent un zona lombaire gauche. À l'examen, nous constations une plaque érythémateuse infiltrée de 2,5cm de diamètre dans la région para-vertébrale lombaire gauche. Le bilan biologique était normal. L'examen histologique révélait un processus inflammatoire sans néovaisseaux, riche en éosinophiles, avec vasculite chronique et infiltrat polymorphe, permettant de retenir le diagnostic de granulome de Lever.DiscussionLe granulome de Lever est une forme localisée de vasculite des petits vaisseaux du derme. Bien qu'il touche généralement le visage, les atteintes extra-faciales existent. Le caractère original de cette présentation, hormis sa localisation, réside dans le fait que le granulome s'était développé sur une cicatrice de zona, ce qui correspond à une réaction isotopique de Wolf. Ce phénomène, décrit par R. Wolf, est l'apparition d'une nouvelle dermatose sur le lieu d'une ancienne dermatose guérie, le plus souvent herpétique. La physiopathologie est encore incertaine. Cette réaction est différente des réactions isomorphiques de type Koebner, où il s'agit de l'apparition d'une dermatose déjà connue sur le lieu d'un traumatisme, et non d'une nouvelle dermatose.ConclusionNous décrivons un cas, à notre connaissance jamais rapporté dans la littérature, de réaction isotopique de Wolf avec un granulome de Lever extra-facial.BackgroundGranuloma faciale (GF), or facial granuloma of Lever, is an uncommon dermatosis occurring classically on the face. We report a case of a GF on zoster scars located on the trunk, which is a highly particular isotopic response.Patients and methodsA 60-year-old man with a sole history of left lumbar zoster presented with a skin lesion present for two months. Clinical examination revealed a 2.5-cm papular erythematous lesion that was both infiltrated and pruritic. This lesion was situated precisely on zoster scars. Lab tests revealed no abnormalities. Histopathologic examination showed an inflammatory process without neovessels but rich in eosinophils with chronic vasculitis and polymorphic infiltrate, on which basis GF was diagnosed.DiscussionGF is a localized form of cutaneous small-vessel vasculitis. Although it usually affects the face, extra-facial locations also exist. The original character of this presentation, aside from the location, is the occurrence of this GF on a zoster scar, which corresponds to Wolf's isotopic response. This phenomenon, described by R. Wolf, comprises the occurrence of a new skin disorder at the site of another unrelated and already healed skin disease, usually herpes. The physiopathology is still unclear. This differs from isomorphic reactions such as Koebner's reaction, which consists of the appearance at an injury site of skin lesions typical of an existing dermatosis but not a new disorder.ConclusionThis is a rare case of Wolf's isotopic response with GF, of which, to our knowledge, there are no reports in the literature.
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Παρασκευή 20 Απριλίου 2018
Granulome de Lever extra-facial sur cicatrice de zona : une réaction isotopique de Wolf
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