Petriellidium boydii是常引起马杜拉足的一种霉菌.近来报告了它可以引起各种其它疾病,特别是关节炎.作者认为本例报告为欧洲第一例.患儿6岁,左膝外伤愈合10天后,膝关节反复红肿,并多次抽出混浊液体,但细菌培养阴性.给予全身和关节内抗生素治疗无效,皮质类固醇治疗后全身症状改善,但关节仍红肿.关节镜检查见到 Petriellidium boydii is a mold that commonly causes foot irritation in malagrae and has recently been reported to cause a variety of other diseases, especially arthritis. The authors consider this case to be the first in Europe. After 10 days, the knee was repeatedly inflamed and the turbid fluid was extracted several times, but the bacterial culture was negative, giving systemic and intra-articular antibiotic therapy ineffective, systemic symptoms improved after corticosteroid treatment, but the joint was still inflamed.