Anaplastic large cell lymphoma, so-called Ki-1 lymphoma: a report of a case of long course

A 55-year-old female with a complaint of tumors on the right lower extremity was reported. The condition was diagnosed as anaplastic large cell lymphoma, so-called Ki-1 lymphoma, by its histological and immunohistochemical features. The clonal proliferation of the infiltrating cells of the skin lesions was confirmed by the analysis of T cell receptor gene rearrangement. The lesions have repeatedly occurred on the right lower extremity for more than ten years. In this report, we also discuss the prognosis of anaplastic large cell lymphoma with or without skin lesions.