丛状纤维组织细胞瘤 (ＰＦＴ)十分罕见 ,好发于儿童和青年 ,尤以女性多见。常累及上肢 ,临床表现为无症状、缓慢生长的皮下或真皮内肿块。镜下可见由多个结节状或丛状增生的组织细胞和肌成纤维细胞构成 ,损害中常有多核破骨样巨细胞成分。作者报道 1例既往体健的 3岁儿童 ,于左 Plexiform fibrous histiocytoma (PFT) is very rare, occurs in children and young people, especially in women more common. Often involving the upper extremity, the clinical manifestations of asymptomatic, slow growth of subcutaneous or dermal mass. Microscope can be seen by a number of nodular or plexiform hyperplasia of tissue cells and myofibroblasts, damage to often multi-core osteoclast-like giant cell components. The authors report 1 case of 3-year-old child with previous health, on the left