这个词是什么意思？
An idiopathic, rapidly evolving, and severely debilitating disease occurring most commonly in association with chronic ulcerative colitis. It is characterized by the presence of boggy, purplish ulcers with undermined borders, appearing mostly on the legs. The majority of cases are in people between 40 and 60 years old. Its etiology is unknown.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D017511 · MeSH 2026。
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