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Jessner's lymphocytic infiltration of the skin: a CD8+ polyclonal reactive skin condition.

BACKGROUND: Jessner's lymphocytic infiltration of the skin (JLIS) is a clinically and histologically distinct disease entity. Conflicting results have been reported concerning its differentiation from cutaneous lupus erythematosus and polymorphous light eruption, its relationship to palpable migratory arciform erythema and its classification as a B-cell or a CD4+ T-cell lymphoproliferative disease.

OBJECTIVE: Our study was performed in order to re-evaluate JLIS clinically and by immunohistochemical and molecular analyses.

METHODS: Stringent inclusion/exclusion criteria were used to collect a cohort of 34 patients with JLIS that did not overlap with lupus erythematosus or polymorphous light eruption. Clinical data were analysed, and immunohistochemical and molecular studies were performed including TCR-gamma PCR GeneScan software analysis of tissue and peripheral blood samples.

RESULTS: In the majority of the patients, the lesions consisted only of papules and plaques while in 12% annular lesions were also seen. The lesions were found on the face (38%), on the trunk and arms (50%) or at both sites (12%). Immunohistochemical analyses revealed a clear predominance of T cells in all patients, and of CD8+ T cells in 77% of the patients. As judged by TCR-gamma PCR GeneScan analysis, 98 and 79% of the tissue and peripheral blood samples, respectively, showed a polyclonal T-cell population; identical T-cell clones were not detected concomitantly in both the skin and the peripheral blood of the same patient.

CONCLUSIONS: JLIS occurs at 2 major predilection sites, that is the face and trunk. Therefore introduction of palpable migratory arciform erythema as a separate entity is not justified. The lymphoid infiltrates are dominated immunohistochemically by CD8+ T cells that do not show clonality on molecular analysis. Thus, JLIS represents a characteristic CD8+ polyclonal reactive skin condition.

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