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  • Title: A reappraisal of the histopathologic criteria for the diagnosis of cutaneous allogeneic acute graft-vs-host disease.
    Author: Massi D, Franchi A, Pimpinelli N, Laszlo D, Bosi A, Santucci M.
    Journal: Am J Clin Pathol; 1999 Dec; 112(6):791-800. PubMed ID: 10587702.
    Abstract:
    To determine the validity of the Lerner grading system and review the histopathologic findings of cutaneous acute graft-vs-host disease (aGVHD), 78 skin biopsy specimens from 49 bone marrow transplant recipients were evaluated. Histopathologic sections were independently reviewed twice by 3 pathologists and classified (Lerner system), without knowledge of the patients' clinical evolution. Intraobserver agreement in grading aGVHD was substantial to almost perfect. Interobserver agreement between pairs of observers was moderate to substantial on first review and substantial on second review. Overall, we found an almost perfect agreement in diagnosing Lerner grade III, whereas areas of disagreement occurred with Lerner grades 0, I, and II. Histopathologically, specimens of patients who developed aGVHD (aGVHD-positive) showed significantly higher frequency of epidermal atrophy, spongiosis, diffuse basal vacuolization, more than 3 single necrotic keratinocytes per high-power field, satellitosis, inflammatory infiltrate, with a predominantly lichenoid pattern, lymphocytic exocytosis, and dermal melanophages. When considering skin samples classified as grade I and II, we found statistically significant differences between aGVHD-positive and aGVHD-negative cases only for the presence of inflammatory infiltrate, lymphocytic exocytosis, and satellitosis. Lerner grading is reproducible, although lesser agreement occurred when evaluating grades I and II, and the Lerner grading system should be revised by including the estimate of the inflammatory infiltrate as an additional criterion for grade II.
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