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Erythema nodosum: clinicopathologic correlations and their use in differential diagnosis.

Authors
Yi, SW; Kim, EH; Kang, HY; Kim, YC; Lee, ES
Citation
Yonsei medical journal, 48(4):601-608, 2007
Journal Title
Yonsei medical journal
ISSN
0513-57961976-2437
Abstract
PURPOSE: Typically, a diagnosis of erythema nodosum (EN) is based on clinical features. However, other diseases manifest with inflammatory nodules of the lower limbs in addition to EN, such as the EN-like lesions of Behcet's disease (BD). The purpose of this retrospective study was to investigate the frequency of histologically proven EN among diseases diagnosed clinically as EN, to determine underlying causes of EN, and to compare clinical and histologic features between EN and other diseases.



PATIENTS AND METHODS: We selected 99 patients diagnosed clinically with EN and performed skin biopsies. All pathologic slides were evaluated and diagnosed; and after histologic diagnoses were made we reviewed the patients' medical records.



RESULTS: Among the 99 patients diagnosed clinically with EN, 47 were biopsy-verified EN. The EN-like lesions of BD and nodular vasculitis were both in the primary differential diagnosis of EN. No definite difference in clinical features exists among these three diseases. Histologically, EN demonstrated septal panniculitis in the majority of patients. Lobular panniculitis was frequently observed in NV, and mixed or mostly lobular panniculitis was observed in the EN-like lesion. Vasculitis was rarely observed in EN; however lymphocytic vasculitis was observed frequently in EN-like lesions and neutrophilic vasculitis was observed in NV. The frequency of granulomatous inflammation was highest in NV. Some cases of patients with typical BD demonstrated classic EN lesions.



CONCLUSION: It was extremely difficult to clinically differentiate EN from EN-like lesions or NV. We feel skin biopsy is mandatory for the diagnosis of lower extremity erythematous nodular lesions.
MeSH terms
AdolescentAdultAgedChildChild, PreschoolDiagnosis, DifferentialErythema Nodosum/etiologyErythema Nodosum/pathology*FemaleHumansInfantInfant, NewbornMaleMiddle AgedRetrospective Studies
DOI
10.3349/ymj.2007.48.4.601
PMID
17722231
Appears in Collections:
Journal Papers > School of Medicine / Graduate School of Medicine > Dermatology
AJOU Authors
강, 희영김, 유찬이, 은소
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